I am receiving warning in Facebook Application using PHP SDK

You need to ensure that any code that modifies the HTTP headers is executed before the headers are sent. This includes statements like session_start(). The headers will be sent automatically when any HTML is output.

Your problem here is that you're sending the HTML ouput at the top of your page before you've executed any PHP at all.

Move the session_start() to the top of your document :

<?php    session_start(); ?> <html> <head> <title>PHP SDK</title> </head> <body> <?php require_once 'src/facebook.php';    // more PHP code here.

Zipping a file in bash fails

Run dos2unix or similar utility on it to remove the carriage returns (^M).

This message indicates that your file has dos-style lineendings:

-bash: /backup/backup.sh: /bin/bash^M: bad interpreter: No such file or directory

Utilities like dos2unix will fix it:

 dos2unix <backup.bash >improved-backup.sh

Or, if no such utility is installed, you can accomplish the same thing with translate:

tr -d "\015\032" <backup.bash >improved-backup.sh

As for how those characters got there in the first place, @MadPhysicist had some good comments.

How is VIP swapping + CNAMEs better than IP swapping + A records?

A VIP swap is an internal change to Azure's routers/load balancers, not an external DNS change. They're just routing traffic to go from one internal [set of] server[s] to another instead. Therefore the DNS info for mysite.cloudapp.net doesn't change at all. Therefore the change for people accessing via the IP bound to mysite.cloudapp.net (and CNAME'd by you) will see the change as soon as the VIP swap is complete.

Is it possible to execute multiple _addItem calls asynchronously using Google Analytics?

From the docs:

_trackTrans() Sends both the transaction and item data to the Google Analytics server. This method should be called after _trackPageview(), and used in conjunction with the _addItem() and addTrans() methods. It should be called after items and transaction elements have been set up.

So, according to the docs, the items get sent when you call trackTrans(). Until you do, you can add items, but the transaction will not be sent.

Edit: Further reading led me here:

http://www.analyticsmarket.com/blog/edit-ecommerce-data

Where it clearly says you can start another transaction with an existing ID. When you commit it, the new items you listed will be added to that transaction.

What's the net::ERR_HTTP2_PROTOCOL_ERROR about?

I have been experiencing this problem for the last week now as I've been trying to send DELETE requests to my PHP server through AJAX. I recently upgraded my hosting plan where I now have an SSL Certificate on my host which stores the PHP and JS files. Since adding an SSL Certificate I no longer experience this issue. Hoping this helps with this strange error.

Angular @ViewChild() error: Expected 2 arguments, but got 1

Angular 8

In Angular 8, ViewChild has another param

@ViewChild('nameInput', {static: false}) component : Component

You can read more about it here and here

Angular 9 & Angular 10

In Angular 9 default value is static: false, so doesn't need to provide param unless you want to use {static: true}

Access blocked by CORS policy: Response to preflight request doesn't pass access control check

CORS headers should be sent from the server. If you use PHP it will be like this:

header('Access-Control-Allow-Origin: your-host');
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Allow-Methods: your-methods like POST,GET');
header('Access-Control-Allow-Headers: content-type or other');
header('Content-Type: application/json');

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

I solved this issue after changing the "Gradle Version" and "Android Plugin version".

You just goto "File>>Project Structure>>Project>>" and make changes here. I have worked a combination of versions from another working project of mine and added to the Project where I was getting this problem.

ping: google.com: Temporary failure in name resolution

If you get the IP address from a DHCP server, you can also set the server to send a DNS server. Or add the nameserver 8.8.8.8 into /etc/resolvconf/resolv.conf.d/base file. The information in this file is included in the resolver configuration file even when no interfaces are configured.

Flutter: RenderBox was not laid out

I had a similir problem, but in my case, I put a row in the leading of the ListView, and it was consuming all the space, of course. I just had to take the Row out of the leading, and it was solved. I would recommend to check if the problem is a larger widget than its container can have.

Expanded(child:MyListView())

Flutter - The method was called on null

You have a CryptoListPresenter _presenter but you are never initializing it. You should either be doing that when you declare it or in your initState() (or another appropriate but called-before-you-need-it method).

One thing I find that helps is that if I know a member is functionally 'final', to actually set it to final as that way the analyzer complains that it hasn't been initialized.

EDIT:

I see diegoveloper beat me to answering this, and that the OP asked a follow up.

@Jake - it's hard for us to tell without knowing exactly what CryptoListPresenter is, but depending on what exactly CryptoListPresenter actually is, generally you'd do final CryptoListPresenter _presenter = new CryptoListPresenter(...);, or

CryptoListPresenter _presenter;

@override
void initState() {
  _presenter = new CryptoListPresenter(...);
}

Flutter- wrapping text

Try Wrap widget to wrap text as text grows:

Example:

Wrap(
  direction: Axis.vertical, //Vertical || Horizontal
  children: <Widget>[
    Text(
      'Your Text',
      style: TextStyle(fontSize: 30),
    ),
    Text(
      'Your Text',
      style: TextStyle(fontSize: 30),
    ),
  ],
),

How to format DateTime in Flutter , How to get current time in flutter?

You can also use this syntax. For YYYY-MM-JJ HH-MM:

var now = DateTime.now();
var month = now.month.toString().padLeft(2, '0');
var day = now.day.toString().padLeft(2, '0');
var text = '${now.year}-$month-$day ${now.hour}:${now.minute}';

Xcode couldn't find any provisioning profiles matching

What fixed it for me was plugging my iPhone and allowing it as a simulator destination. Doing so required my to register my iPhone in Apple Dev account and once that was done and I ran my project from Xcode on my iPhone everything fixed itself.

Connect your iPhone to your Mac
Xcode>Window>Devices & Simulators
Add new under Devices and make sure "show are run destination" is ticked
Build project and run it on your iPhone

Connection Java-MySql : Public Key Retrieval is not allowed

You should add client option to your mysql-connector allowPublicKeyRetrieval=true to allow the client to automatically request the public key from the server. Note that AllowPublicKeyRetrieval=True could allow a malicious proxy to perform a MITM attack to get the plaintext password, so it is False by default and must be explicitly enabled.

https://mysql-net.github.io/MySqlConnector/connection-options/

you could also try adding useSSL=false when you use it for testing/develop purposes

example:

jdbc:mysql://localhost:3306/db?allowPublicKeyRetrieval=true&useSSL=false

Dart: mapping a list (list.map)

you can use

moviesTitles.map((title) => Tab(text: title)).toList()

example:

    bottom: new TabBar(
      controller: _controller,
      isScrollable: true,
      tabs:
        moviesTitles.map((title) => Tab(text: title)).toList()
      ,
    ),

Not able to install Python packages [SSL: TLSV1_ALERT_PROTOCOL_VERSION]

@Anupam's solution worked for me. However, I had to use sudo and specify the exact location of my virtual Python environment:

curl https://bootstrap.pypa.io/get-pip.py | sudo /Users/{your user name}/{path to python}/bin/python

What could cause an error related to npm not being able to find a file? No contents in my node_modules subfolder. Why is that?

In my case I tried to run npm i [email protected] and got the error because the dev server was running in another terminal on vsc. Hit ctrl+c, y to stop it in that terminal, and then installation works.

Spring Data JPA findOne() change to Optional how to use this?

From at least, the 2.0 version, Spring-Data-Jpa modified findOne().
Now, findOne() has neither the same signature nor the same behavior.
Previously, it was defined in the CrudRepository interface as:

T findOne(ID primaryKey);

Now, the single findOne() method that you will find in CrudRepository is the one defined in the QueryByExampleExecutor interface as:

<S extends T> Optional<S> findOne(Example<S> example);

That is implemented finally by SimpleJpaRepository, the default implementation of the CrudRepository interface.
This method is a query by example search and you don't want that as a replacement.

In fact, the method with the same behavior is still there in the new API, but the method name has changed.
It was renamed from findOne() to findById() in the CrudRepository interface :

Optional<T> findById(ID id);

Now it returns an Optional, which is not so bad to prevent NullPointerException.

So, the actual method to invoke is now Optional<T> findById(ID id).

How to use that?
Learning Optional usage. Here's important information about its specification:

A container object which may or may not contain a non-null value. If a value is present, isPresent() will return true and get() will return the value.

Additional methods that depend on the presence or absence of a contained value are provided, such as orElse() (return a default value if value not present) and ifPresent() (execute a block of code if the value is present).

Some hints on how to use Optional with Optional<T> findById(ID id).

Generally, as you look for an entity by id, you want to return it or make a particular processing if that is not retrieved.

Here are three classical usage examples.

Suppose that if the entity is found you want to get it otherwise you want to get a default value.

You could write :

Foo foo = repository.findById(id)
                    .orElse(new Foo());

or get a null default value if it makes sense (same behavior as before the API change) :

Foo foo = repository.findById(id)
                    .orElse(null);

Suppose that if the entity is found you want to return it, else you want to throw an exception.

You could write :

return repository.findById(id)
        .orElseThrow(() -> new EntityNotFoundException(id));

Suppose you want to apply a different processing according to if the entity is found or not (without necessarily throwing an exception).

You could write :

Optional<Foo> fooOptional = fooRepository.findById(id);
if (fooOptional.isPresent()) {
    Foo foo = fooOptional.get();
    // processing with foo ...
} else {
    // alternative processing....
}

After Spring Boot 2.0 migration: jdbcUrl is required with driverClassName

This worked for me.

application.properties, used jdbc-url instead of url:

datasource.apidb.jdbc-url=jdbc:mysql://localhost:3306/apidb?useSSL=false
datasource.apidb.username=root
datasource.apidb.password=123
datasource.apidb.driver-class-name=com.mysql.jdbc.Driver

Configuration class:

@Configuration
@EnableJpaRepositories(
        entityManagerFactoryRef = "fooEntityManagerFactory",
        basePackages = {"com.buddhi.multidatasource.foo.repository"}
)
public class FooDataSourceConfig {

    @Bean(name = "fooDataSource")
    @ConfigurationProperties(prefix = "datasource.foo")
    public HikariDataSource dataSource() {
        return DataSourceBuilder.create().type(HikariDataSource.class).build();
    }

    @Bean(name = "fooEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean fooEntityManagerFactory(
            EntityManagerFactoryBuilder builder,
            @Qualifier("fooDataSource") DataSource dataSource
    ) {
        return builder
                .dataSource(dataSource)
                .packages("com.buddhi.multidatasource.foo.model")
                .persistenceUnit("fooDb")
                .build();
    }
}

How do I deal with installing peer dependencies in Angular CLI?

I found that running the npm install command in the same directory where your Angular project is, eliminates these warnings. I do not know the reason why.

Specifically, I was trying to use ng2-completer

$ npm install ng2-completer --save
npm WARN saveError ENOENT: no such file or directory, open 'C:\Work\foo\package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open 'C:\Work\foo\package.json'
npm WARN [email protected] requires a peer of @angular/common@>= 6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of @angular/core@>= 6.0.0 but noneis installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of @angular/forms@>= 6.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN foo No description
npm WARN foo No repository field.
npm WARN foo No README data
npm WARN foo No license field.

I was unable to compile. When I tried again, this time in my Angular project directory which was in foo/foo_app, it worked fine.

cd foo/foo_app
$ npm install ng2-completer --save

Numpy Resize/Rescale Image

For people coming here from Google looking for a fast way to downsample images in numpy arrays for use in Machine Learning applications, here's a super fast method (adapted from here ). This method only works when the input dimensions are a multiple of the output dimensions.

The following examples downsample from 128x128 to 64x64 (this can be easily changed).

Channels last ordering

# large image is shape (128, 128, 3)
# small image is shape (64, 64, 3)
input_size = 128
output_size = 64
bin_size = input_size // output_size
small_image = large_image.reshape((output_size, bin_size, 
                                   output_size, bin_size, 3)).max(3).max(1)

Channels first ordering

# large image is shape (3, 128, 128)
# small image is shape (3, 64, 64)
input_size = 128
output_size = 64
bin_size = input_size // output_size
small_image = large_image.reshape((3, output_size, bin_size, 
                                      output_size, bin_size)).max(4).max(2)

For grayscale images just change the 3 to a 1 like this:

Channels first ordering

# large image is shape (1, 128, 128)
# small image is shape (1, 64, 64)
input_size = 128
output_size = 64
bin_size = input_size // output_size
small_image = large_image.reshape((1, output_size, bin_size,
                                      output_size, bin_size)).max(4).max(2)

This method uses the equivalent of max pooling. It's the fastest way to do this that I've found.

forEach() in React JSX does not output any HTML

You need to pass an array of element to jsx. The problem is that forEach does not return anything (i.e it returns undefined). So it's better to use map because map returns an array:

class QuestionSet extends Component {
render(){ 
    <div className="container">
       <h1>{this.props.question.text}</h1>
       {this.props.question.answers.map((answer, i) => {     
           console.log("Entered");                 
           // Return the element. Also pass key     
           return (<Answer key={answer} answer={answer} />) 
        })}
}

export default QuestionSet;

java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0

Enable Multidex through build.gradle of your app module

multiDexEnabled true

Same as below -

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.xx.xxx"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        multiDexEnabled true //Add this
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            shrinkResources true
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

Then follow below steps -

From the Build menu -> press the Clean Project button.
When task completed, press the Rebuild Project button from the Build menu.
From menu File -> Invalidate cashes / Restart

compile is now deprecated so it's better to use implementation or api

How to solve npm install throwing fsevents warning on non-MAC OS?

I had got this error, Linux system(Ubuntu) and This might happen when you run :

npm install

1) If the project is not present in your localdisk/computer, copy it to your computer and try again. So you get the permission to access folder (Just make sure you have access permission).

2) If you still get some warnings or errors, run:

npm audit fix

This will solve vulnerabilities in your dependencies and can help you fix a vulnerability by providing simple-to-run npm commands and recommendations for further troubleshooting.

Hope it helps!

Codesign wants to access key "access" in your keychain, I put in my login password but keeps asking me

Enter the password you use to open you Mac session and click on "Always allow" until all alerts are closed. The other buttons do not work...

How do I use Safe Area Layout programmatically?

For those of you who use SnapKit, just like me, the solution is anchoring your constraints to view.safeAreaLayoutGuide like so:

yourView.snp.makeConstraints { (make) in
    if #available(iOS 11.0, *) {
        //Bottom guide
        make.bottom.equalTo(view.safeAreaLayoutGuide.snp.bottomMargin)
        //Top guide
        make.top.equalTo(view.safeAreaLayoutGuide.snp.topMargin)
        //Leading guide
        make.leading.equalTo(view.safeAreaLayoutGuide.snp.leadingMargin)
        //Trailing guide
        make.trailing.equalTo(view.safeAreaLayoutGuide.snp.trailingMargin)

     } else {
        make.edges.equalToSuperview()
     }
}

git clone error: RPC failed; curl 56 OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 10054

I had the same issue, and I have solved it by changing my net connection. In fact, my last internet connection was too slow (45 kbit/s). So you should try again with a faster net connection.

No converter found capable of converting from type to type

Simple Solution::

use {nativeQuery=true} in your query.

for example

  @Query(value = "select d.id,d.name,d.breed,d.origin from Dog d",nativeQuery = true)
        
    List<Dog> findALL();

JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value

Spring Boot 2.2.2 / Gradle:

Gradle (build.gradle):

implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310")

Entity (User.class):

LocalDate dateOfBirth;

Code:

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
User user = mapper.readValue(json, User.class);

CSS Grid Layout not working in IE11 even with prefixes

IE11 uses an older version of the Grid specification.

The properties you are using don't exist in the older grid spec. Using prefixes makes no difference.

Here are three problems I see right off the bat.

`repeat()`

The repeat() function doesn't exist in the older spec, so it isn't supported by IE11.

You need to use the correct syntax, which is covered in another answer to this post, or declare all row and column lengths.

Instead of:

.grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: repeat( 4, 1fr );
      grid-template-columns: repeat( 4, 1fr );
  -ms-grid-rows: repeat( 4, 270px );
      grid-template-rows: repeat( 4, 270px );
  grid-gap: 30px;
}

Use:

.grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 1fr 1fr 1fr;             /* adjusted */
      grid-template-columns:  repeat( 4, 1fr );
  -ms-grid-rows: 270px 270px 270px 270px;        /* adjusted */
      grid-template-rows: repeat( 4, 270px );
  grid-gap: 30px;
}

Older spec reference: https://www.w3.org/TR/2011/WD-css3-grid-layout-20110407/#grid-repeating-columns-and-rows

`span`

The span keyword doesn't exist in the older spec, so it isn't supported by IE11. You'll have to use the equivalent properties for these browsers.

Instead of:

.grid .grid-item.height-2x {
  -ms-grid-row: span 2;
      grid-row: span 2;
}
.grid .grid-item.width-2x {
  -ms-grid-column: span 2;
      grid-column: span 2;
}

Use:

.grid .grid-item.height-2x {
  -ms-grid-row-span: 2;          /* adjusted */
      grid-row: span 2;
}
.grid .grid-item.width-2x {
  -ms-grid-column-span: 2;       /* adjusted */
      grid-column: span 2;
}

Older spec reference: https://www.w3.org/TR/2011/WD-css3-grid-layout-20110407/#grid-row-span-and-grid-column-span

`grid-gap`

The grid-gap property, as well as its long-hand forms grid-column-gap and grid-row-gap, don't exist in the older spec, so they aren't supported by IE11. You'll have to find another way to separate the boxes. I haven't read the entire older spec, so there may be a method. Otherwise, try margins.

grid item auto placement

There was some discussion in the old spec about grid item auto placement, but the feature was never implemented in IE11. (Auto placement of grid items is now standard in current browsers).

So unless you specifically define the placement of grid items, they will stack in cell 1,1.

Use the -ms-grid-row and -ms-grid-column properties.

No String-argument constructor/factory method to deserialize from String value ('')

Try setting mapper.configure(DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true)

mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);

depending on your Jackson version.

Returning JSON object as response in Spring Boot

use ResponseEntity<ResponseBean>

Here you can use ResponseBean or Any java bean as you like to return your api response and it is the best practice. I have used Enum for response. it will return status code and status message of API.

@GetMapping(path = "/login")
public ResponseEntity<ServiceStatus> restApiExample(HttpServletRequest request,
            HttpServletResponse response) {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        loginService.login(username, password, request);
        return new ResponseEntity<ServiceStatus>(ServiceStatus.LOGIN_SUCCESS,
                HttpStatus.ACCEPTED);
    }

for response ServiceStatus or(ResponseBody)

    public enum ServiceStatus {

    LOGIN_SUCCESS(0, "Login success"),

    private final int id;
    private final String message;

    //Enum constructor
    ServiceStatus(int id, String message) {
        this.id = id;
        this.message = message;
    }

    public int getId() {
        return id;
    }

    public String getMessage() {
        return message;
    }
}

Spring REST API should have below key in response

Status Code
Message

you will get final response below

{

   "StatusCode" : "0",

   "Message":"Login success"

}

you can use ResponseBody(java POJO, ENUM,etc..) as per your requirement.

Kubernetes Pod fails with CrashLoopBackOff

I faced similar issue "CrashLoopBackOff" when I debugged getting pods and logs of pod. Found out that my command arguments are wrong

Vue Js - Loop via v-for X times (in a range)

You can use the native JS slice method:

<div v-for="item in shoppingItems.slice(0,10)">

The slice() method returns the selected elements in an array, as a new array object.

Based on tip in the migration guide: https://vuejs.org/v2/guide/migration.html#Replacing-the-limitBy-Filter

How to convert JSON string into List of Java object?

StudentList studentList = mapper.readValue(jsonString,StudentList.class);

Change this to this one

StudentList studentList = mapper.readValue(jsonString, new TypeReference<List<Student>>(){});

RestClientException: Could not extract response. no suitable HttpMessageConverter found

Spring sets the default content-type to octet-stream when the response is missing that field. All you need to do is to add a message converter to fix this.

Jersey stopped working with InjectionManagerFactory not found

Here is the reason. Starting from Jersey 2.26, Jersey removed HK2 as a hard dependency. It created an SPI as a facade for the dependency injection provider, in the form of the InjectionManager and InjectionManagerFactory. So for Jersey to run, we need to have an implementation of the InjectionManagerFactory. There are two implementations of this, which are for HK2 and CDI. The HK2 dependency is the jersey-hk2 others are talking about.

<dependency>
    <groupId>org.glassfish.jersey.inject</groupId>
    <artifactId>jersey-hk2</artifactId>
    <version>2.26</version>
</dependency>

The CDI dependency is

<dependency>
    <groupId>org.glassfish.jersey.inject</groupId>
    <artifactId>jersey-cdi2-se</artifactId>
    <version>2.26</version>
</dependency>

This (jersey-cdi2-se) should only be used for SE environments and not EE environments.

Jersey made this change to allow others to provide their own dependency injection framework. They don't have any plans to implement any other InjectionManagers, though others have made attempts at implementing one for Guice.

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

I was running the project through Intellij and this got this error after I stopped the running server and restarted it. Killing all the java processes and restarting the app helped.

How to change the application launcher icon on Flutter?

I would suggest You to use this website Linked Below

App Icon Creator

Step-1: upload The Image,

Step-2: Make necessary Changes And Click on download(dont change the file name)

Step-3: Extract the Downloaded Zip File In the respective folder

android/app/src/main/res

Docker "ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network"

I fixed this issue by steps :

turn off your network (wireless or wired...).
reboot your system.
before turning on your network on PC, execute command docker-compose up, it's going to create new network.
then you can turn network on and go on ...

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists. on deploying to tomcat

Almost same problem get resolved by creating a geoexplorer.xml file in /opt/apache-tomcat-8.5.37/conf/Catalina/localhost content of geoexplorer.xml file is

<Context displayName="geoexplorer" docBase="/usr/share/opengeo/geoexplorer" path="/geoexplorer"/>

How to use paths in tsconfig.json?

This works for me:

 yarn add --dev tsconfig-paths

 ts-node -r tsconfig-paths/register <your-index-file>.ts

This loads all paths in tsconfig.json. A sample tsconfig.json:

{
    "compilerOptions": {
        {…}
        "baseUrl": "./src",
        "paths": {
            "assets/*": [ "assets/*" ],
            "styles/*": [ "styles/*" ]
        }
    },
}

Make sure you have both baseUrl and paths for this to work

And then you can import like :

import {AlarmIcon} from 'assets/icons'

CSS grid wrapping

Here's my attempt. Excuse the fluff, I was feeling extra creative.

My method is a parent div with fixed dimensions. The rest is just fitting the content inside that div accordingly.

This will rescale the images regardless of the aspect ratio. There will be no hard cropping either.

_x000D_

body {_x000D_
    background: #131418;_x000D_
    text-align: center;_x000D_
    margin: 0 auto;_x000D_
}_x000D_
_x000D_
.my-image-parent {_x000D_
    display: inline-block;_x000D_
    width: 300px;_x000D_
    height: 300px;_x000D_
    line-height: 300px; /* Should match your div height */_x000D_
    text-align: center;_x000D_
    font-size: 0;_x000D_
}_x000D_
_x000D_
/* Start demonstration background fluff */_x000D_
    .bg1 {background: url(https://unsplash.it/801/799);}_x000D_
    .bg2 {background: url(https://unsplash.it/799/800);}_x000D_
    .bg3 {background: url(https://unsplash.it/800/799);}_x000D_
    .bg4 {background: url(https://unsplash.it/801/801);}_x000D_
    .bg5 {background: url(https://unsplash.it/802/800);}_x000D_
    .bg6 {background: url(https://unsplash.it/800/802);}_x000D_
    .bg7 {background: url(https://unsplash.it/802/802);}_x000D_
    .bg8 {background: url(https://unsplash.it/803/800);}_x000D_
    .bg9 {background: url(https://unsplash.it/800/803);}_x000D_
    .bg10 {background: url(https://unsplash.it/803/803);}_x000D_
    .bg11 {background: url(https://unsplash.it/803/799);}_x000D_
    .bg12 {background: url(https://unsplash.it/799/803);}_x000D_
    .bg13 {background: url(https://unsplash.it/806/799);}_x000D_
    .bg14 {background: url(https://unsplash.it/805/799);}_x000D_
    .bg15 {background: url(https://unsplash.it/798/804);}_x000D_
    .bg16 {background: url(https://unsplash.it/804/799);}_x000D_
    .bg17 {background: url(https://unsplash.it/804/804);}_x000D_
    .bg18 {background: url(https://unsplash.it/799/804);}_x000D_
    .bg19 {background: url(https://unsplash.it/798/803);}_x000D_
    .bg20 {background: url(https://unsplash.it/803/797);}_x000D_
/* end demonstration background fluff */_x000D_
_x000D_
.my-image {_x000D_
    width: auto;_x000D_
    height: 100%;_x000D_
    vertical-align: middle;_x000D_
    background-size: contain;_x000D_
    background-position: center;_x000D_
    background-repeat: no-repeat;_x000D_
}

_x000D_

<div class="my-image-parent">_x000D_
    <div class="my-image bg1"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg2"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg3"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg4"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg5"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg6"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg7"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg8"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg9"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg10"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg11"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg12"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg13"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg14"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg15"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg16"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg17"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg18"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg19"></div>_x000D_
</div>_x000D_
_x000D_
<div class="my-image-parent">_x000D_
    <div class="my-image bg20"></div>_x000D_
</div>

_x000D_

Field 'browser' doesn't contain a valid alias configuration

I'm building a React server-side renderer and found this can also occur when building a separate server config from scratch. If you're seeing this error, try the following:

Make sure your "entry" value is properly pathed relative to your "context" value. Mine was missing the preceeding "./" before the entry file name.
Make sure you have your "resolve" value included. Your imports on anything in node_modules will default to looking in your "context" folder, otherwise.

Example:

const serverConfig = {
name: 'server',
context: path.join(__dirname, 'src'),
entry: {serverEntry: ['./server-entry.js']},
output: {
    path: path.join(__dirname, 'public'),
    filename: 'server.js',
    publicPath: 'public/',
    libraryTarget: 'commonjs2'
},
module: {
    rules: [/*...*/]
},
resolveLoader: {
    modules: [
        path.join(__dirname, 'node_modules')
    ]
},
resolve: {
    modules: [
        path.join(__dirname, 'node_modules')
    ]
}
};

'Field required a bean of type that could not be found.' error spring restful API using mongodb

Add @Repository in your dao class

    @Repository
    public interface UserDao extends CrudRepository<User, Long> {
         User findByUsername(String username);
         User findByEmail(String email);    
      }

Unsupported Media Type in postman

You need to set the content-type in postman as JSON (application/json).

Go to the body inside your POST request, there you will find the raw option.

Right next to it, there will be a drop down, select JSON (application.json).

Wrapping a react-router Link in an html button

Update for React Router version 6:

The various answers here are like a timeline of react-router's evolution

Using the latest hooks from react-router v6, this can now be done easily with the useNavigate hook.

import { useNavigate } from 'react-router-dom'      

function MyLinkButton() {
  const navigate = useNavigate()
  return (
      <button onClick={() => navigate("/home")}>
        Go Home
      </button>
  );
}

How can I serve static html from spring boot?

As it is written before, some folders (/META-INF/resources/, /resources/, /static/, /public/) serve static content by default, conroller misconfiguration can break this behaviour.

It is a common pitfall that people define the base url of a controller in the @RestController annotation, instead of the @RequestMapping annotation on the top of the controllers.

This is wrong:

@RestController("/api/base")
public class MyController {

    @PostMapping
    public String myPostMethod( ...) {

The above example will prevent you from opening the index.html. The Spring expects a POST method at the root, because the myPostMethod is mapped to the "/" path.

You have to use this instead:

@RestController
@RequestMapping("/api/base")
public class MyController {

    @PostMapping
    public String myPostMethod( ...) {

Chrome violation : [Violation] Handler took 83ms of runtime

Perhaps a little off topic, just be informed that these kind of messages can also be seen when you are debugging your code with a breakpoint inside an async function like setTimeout like below:

[Violation] 'setTimeout' handler took 43129ms

That number (43129ms) depends on how long you stop in your async function

Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens

It happened to me when I had a same port used in ssh tunnel SOCKS to run Proxy in 8080 port and my server and my firefox browser proxy was set to that port and got this issue.

MultipartException: Current request is not a multipart request

in ARC (advanced rest client) - specify as below to make it work Content-Type multipart/form-data (this is header name and header value) this allows you to add form data as key and values you can specify you field name now as per your REST specification and select your file to upload from file selector.

How to parse JSON in Kotlin?

There is no question that the future of parsing in Kotlin will be with kotlinx.serialization. It is part of Kotlin libraries. Version kotlinx.serialization 1.0 is finally released

https://github.com/Kotlin/kotlinx.serialization

import kotlinx.serialization.*
import kotlinx.serialization.json.JSON

@Serializable
data class MyModel(val a: Int, @Optional val b: String = "42")

fun main(args: Array<String>) {

    // serializing objects
    val jsonData = JSON.stringify(MyModel.serializer(), MyModel(42))
    println(jsonData) // {"a": 42, "b": "42"}
    
    // serializing lists
    val jsonList = JSON.stringify(MyModel.serializer().list, listOf(MyModel(42)))
    println(jsonList) // [{"a": 42, "b": "42"}]

    // parsing data back
    val obj = JSON.parse(MyModel.serializer(), """{"a":42}""")
    println(obj) // MyModel(a=42, b="42")
}

Consider defining a bean of type 'service' in your configuration [Spring boot]

Even after doing all the method suggested, i was getting the same error. After trying hard, i got to know that hibernate's maven dependency was added in my pom.xml, as i removed it, application started successfully.

I removed this dependency:

<dependency> <groupId>org.hibernate.javax.persistence</groupId>
 <artifactId>hibernate-jpa-2.0-api</artifactId>
             <version>1.0.1.Final</version>
         </dependency>

My kubernetes pods keep crashing with "CrashLoopBackOff" but I can't find any log

Whilst troubleshooting the same issue I found no logs when using kubeclt logs <pod_id>. Therefore I ssh:ed in to the node instance to try to run the container using plain docker. To my surprise this failed also.

When entering the container with:

docker exec -it faulty:latest /bin/sh

and poking around I found that it wasn't the latest version.

A faulty version of the docker image was already available on the instance.

When I removed the faulty:latest instance with:

docker rmi faulty:latest

everything started to work.

UnsatisfiedDependencyException: Error creating bean with name

I had the exactly same issue, with a very very long stack trace. At the end of the trace I saw this:

InvalidQueryException: Keyspace 'mykeyspace' does not exist

I created the keyspace in cassandra, and solved the problem.

CREATE KEYSPACE mykeyspace
  WITH REPLICATION = { 
   'class' : 'SimpleStrategy', 
   'replication_factor' : 1 
  };

How to decrease prod bundle size?

One thing I wish to share is how imported libraries increase the size of the dist. I had angular2-moment package imported, whereas I could do all the date time formatting I required using the standard DatePipe exported from @angular/common.

With Angular2-Moment "angular2-moment": "^1.6.0",

chunk {0} polyfills.036982dc15bb5fc67cb8.bundle.js (polyfills) 191 kB {4} [initial] [rendered] chunk {1} main.e7496551a26816427b68.bundle.js (main) 2.2 MB {3} [initial] [rendered] chunk {2} styles.056656ed596d26ba0192.bundle.css (styles) 69 bytes {4} [initial] [rendered] chunk {3} vendor.62c2cfe0ca794a5006d1.bundle.js (vendor) 3.84 MB [initial] [rendered] chunk {4} inline.0b9c3de53405d705e757.bundle.js (inline) 0 bytes [entry] [rendered]

After removing Angular2-moment and using DatePipe instead

chunk {0} polyfills.036982dc15bb5fc67cb8.bundle.js (polyfills) 191 kB {4} [initial] [rendered] chunk {1} main.f2b62721788695a4655c.bundle.js (main) 2.2 MB {3} [initial] [rendered] chunk {2} styles.056656ed596d26ba0192.bundle.css (styles) 69 bytes {4} [initial] [rendered] chunk {3} vendor.e1de06303258c58c9d01.bundle.js (vendor) 3.35 MB [initial] [rendered] chunk {4} inline.3ae24861b3637391ba70.bundle.js (inline) 0 bytes [entry] [rendered]

Note the vendor bundle has reduced half a Megabyte!

Point is it is worth checking what angular standard packages can do even if you are already familiar with an external lib.

How to upgrade Angular CLI project?

USEFUL:

Use the official Angular Update Guide select your current version and the version you wish to upgrade to for the relevant upgrade guide. https://update.angular.io/

See GitHub repository Angular CLI diff for comparing Angular CLI changes. https://github.com/cexbrayat/angular-cli-diff/

UPDATED 26/12/2018:

Use the official Angular Update Guide mentioned in the useful section above. It provides the most up to date information with links to other resources that may be useful during the upgrade.

UPDATED 08/05/2018:

Angular CLI 1.7 introduced ng update.

ng update

A new Angular CLI command to help simplify keeping your projects up to date with the latest versions. Packages can define logic which will be applied to your projects to ensure usage of latest features as well as making changes to reduce or eliminate the impact related to breaking changes.

Configuration information for ng update can be found here

1.7 to 6 update

CLI 1.7 does not support an automatic v6 update. Manually install @angular/cli via your package manager, then run the update migration schematic to finish the process.

npm install @angular/cli@^6.0.0
ng update @angular/cli --migrate-only --from=1

UPDATED 30/04/2017:

1.0 Update

You should now follow the Angular CLI migration guide

UPDATED 04/03/2017:

RC Update

You should follow the Angular CLI RC migration guide

UPDATED 20/02/2017:

Please be aware 1.0.0-beta.32 has breaking changes and has removed ng init and ng update

The pull request here states the following:

BREAKING CHANGE: Removing the ng init & ng update commands because their current implementation causes more problems than it solves. Update functionality will return to the CLI, until then manual updates of applications will need done.

The angular-cli CHANGELOG.md states the following:

BREAKING CHANGES - @angular/cli: Removing the ng init & ng update commands because their current implementation causes more problems than it solves. Once RC is released, we won't need to use those to update anymore as the step will be as simple as installing the latest version of the CLI.

UPDATED 17/02/2017:

Angular-cli has now been added to the NPM @angular package. You should now replace the above command with the following -

Global package:

npm uninstall -g angular-cli @angular/cli
npm cache clean
npm install -g @angular/cli@latest

Local project package:

rm -rf node_modules dist # On Windows use rmdir /s /q node_modules dist
npm install --save-dev @angular/cli@latest
npm install
ng init

ORIGINAL ANSWER

You should follow the steps from the README.md on GitHub for updating angular via the angular-cli.

Here they are:

Updating angular-cli

To update angular-cli to a new version, you must update both the global package and your project's local package.

Global package:

npm uninstall -g angular-cli
npm cache clean
npm install -g angular-cli@latest

Local project package:

rm -rf node_modules dist tmp # On Windows use rmdir /s /q node_modules dist tmp
npm install --save-dev angular-cli@latest
npm install
ng init

Running ng init will check for changes in all the auto-generated files created by ng new and allow you to update yours. You are offered four choices for each changed file: y (overwrite), n (don't overwrite), d (show diff between your file and the updated file) and h (help).

Carefully read the diffs for each code file, and either accept the changes or incorporate them manually after ng init finishes.

"ssl module in Python is not available" when installing package with pip3

In Ubuntu, this can help:

cd Python-3.6.2
./configure --with-ssl
make
sudo make install

Rebuild Docker container on file changes

You can run build for a specific service by running docker-compose up --build <service name> where the service name must match how did you call it in your docker-compose file.

Example Let's assume that your docker-compose file contains many services (.net app - database - let's encrypt... etc) and you want to update only the .net app which named as application in docker-compose file. You can then simply run docker-compose up --build application

Extra parameters In case you want to add extra parameters to your command such as -d for running in the background, the parameter must be before the service name: docker-compose up --build -d application

PHP error: "The zip extension and unzip command are both missing, skipping."

For Debian Jessie (which is the current default for the PHP image on Docker Hub):

apt-get install --yes zip unzip php-pclzip

You can omit the --yes, but it's useful when you're RUN-ing it in a Dockerfile.

currently unable to handle this request HTTP ERROR 500

My take on this for future people watching this:

This could also happen if you're using: <? instead of <?php.

Tomcat 8 is not able to handle get request with '|' in query parameters?

Escape it. The pipe symbol is one that has been handled differently over time and between browsers. For instance, Chrome and Firefox convert a URL with pipe differently when copy/paste them. However, the most compatible, and necessary with Tomcat 8.5 it seems, is to escape it:

http://localhost:8080/app/handleResponse?msg=name%7Cid%7C

Spring security CORS Filter

Ok, after over 2 days of searching we finally fixed the problem. We deleted all our filter and configurations and instead used this 5 lines of code in the application class.

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        final ApplicationContext ctx = SpringApplication.run(Application.class, args);
    }

    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurerAdapter() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").allowedOrigins("http://localhost:3000");
            }
        };
    }
}

Consider defining a bean of type 'package' in your configuration [Spring-Boot]

Adding Spring Boot Data JPA Starter dependency solved the issue for me.

Maven

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    <version>2.2.6.RELEASE</version>
</dependency>

Gradle

compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '2.2.6.RELEASE'

Or you can go directly here

Deserialize Java 8 LocalDateTime with JacksonMapper

This worked for me :

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.annotation.DateTimeFormat.ISO;

@Column(name="end_date", nullable = false)
@DateTimeFormat(iso = ISO.DATE_TIME)
@JsonFormat(pattern = "yyyy-MM-dd HH:mm")
private LocalDateTime endDate;

npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]

This is fixed in npm 7. See npm/cli#PR169

How to do tag wrapping in VS code?

Many commands are already attached to simple ctrl+[key], you can also do chorded keybinding like ctrl a+b.

(In case this is your first time reading about chorded keybindings: They work by not letting go of the ctrl key and pressing a second key after the first.)

I have my Emmet: Wrap with Abbreviation bound to ((ctrl) (w+a)).

In windows: File > Preferences > Keyboard Shortcuts ((ctrl) (k+s))> search for Wrap with Abbreviation > double-click > add your combonation.

How to import a CSS file in a React Component

The following imports an external CSS file in a React component and outputs the CSS rules in the <head /> of the website.

Install Style Loader and CSS Loader:

npm install --save-dev style-loader
npm install --save-dev css-loader

In webpack.config.js:

module.exports = {
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [ 'style-loader', 'css-loader' ]
            }
        ]
    }
}

In a component file:

import './path/to/file.css';

gzip: stdin: not in gzip format tar: Child returned status 1 tar: Error is not recoverable: exiting now

Just click first on that link and go to HTML page where actual downloads or mirrors are.

Its really misleading to have full link which ends in .tgz when it actually leads to HTML page where real download links are. I had this problem downloading Apache Spark and wget-ing it into Ubuntu.

https://spark.apache.org/downloads.html

Elasticsearch : Root mapping definition has unsupported parameters index : not_analyzed

PUT /testIndex
{
    "mappings": {
        "properties": {     <--ADD THIS
            "field1": {
                "type": "integer"
            },
            "field2": {  
                "type": "integer"
            },
            "field3": {
                "type": "string",
                "index": "not_analyzed"
            },
            "field4": {
                "type": "string",
                "analyzer": "autocomplete",
                "search_analyzer": "standard"
            }
        }
    },
    "settings": {
        bla
        bla
        bla
    }
}

Here's a similar command I know works:

curl -v -H "Content-Type: application/json" -H "Authorization: Basic cGC3COJ1c2Vy925hZGFJbXBvcnABCnRl" -X PUT -d '{"mappings":{"properties":{"city":{"type": "text"}}}}' https://35.80.2.21/manzanaIndex

The breakdown for the above curl command is:

PUT /manzanaIndex
{
    "mappings":{
        "properties":{
                "city":{
                    "type": "text"
                }
        }
    }
}

Docker-Compose persistent data MySQL

The data container is a superfluous workaround. Data-volumes would do the trick for you. Alter your docker-compose.yml to:

version: '2'
services:
  mysql:
    container_name: flask_mysql
    restart: always
    image: mysql:latest
    environment:
      MYSQL_ROOT_PASSWORD: 'test_pass' # TODO: Change this
      MYSQL_USER: 'test'
      MYSQL_PASS: 'pass'
    volumes:
      - my-datavolume:/var/lib/mysql
volumes:
  my-datavolume:

Docker will create the volume for you in the /var/lib/docker/volumes folder. This volume persist as long as you are not typing docker-compose down -v

Difference between the annotations @GetMapping and @RequestMapping(method = RequestMethod.GET)

As you can see here:

Specifically, @GetMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.GET).

Difference between @GetMapping & @RequestMapping

@GetMapping supports the consumes attribute like @RequestMapping.

How to upload a file and JSON data in Postman?

If you are using cookies to keep session, you can use interceptor to share cookies from browser to postman.

Also to upload a file you can use form-data tab under body tab on postman, In which you can provide data in key-value format and for each key you can select the type of value text/file. when you select file type option appeared to upload the file.

Make the size of a heatmap bigger with seaborn

You could alter the figsize by passing a tuple showing the width, height parameters you would like to keep.

import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(10,10))         # Sample figsize in inches
sns.heatmap(df1.iloc[:, 1:6:], annot=True, linewidths=.5, ax=ax)

EDIT

I remember answering a similar question of yours where you had to set the index as TIMESTAMP. So, you could then do something like below:

df = df.set_index('TIMESTAMP')
df.resample('30min').mean()
fig, ax = plt.subplots()
ax = sns.heatmap(df.iloc[:, 1:6:], annot=True, linewidths=.5)
ax.set_yticklabels([i.strftime("%Y-%m-%d %H:%M:%S") for i in df.index], rotation=0)

For the head of the dataframe you posted, the plot would look like:

How to return a html page from a restful controller in spring boot?

@Controller
public class HomeController {

    @RequestMapping(method = RequestMethod.GET, value = "/")
    public ModelAndView welcome() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("login.html");
        return modelAndView;
    }
}

This will return the Login.html File. The Login.html should be inside the static Folder.

Note: thymeleaf dependency is not added

@RestController
public class HomeController {

    @RequestMapping(method = RequestMethod.GET, value = "/")
    public String welcome() {
        return "login";
    }
}

This will return the String login

Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)

In my case the reason was in this line:

Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.
In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

My project used a third-party plugin, that is incompatible with the newest gradle plugin version. So updating plugins versions may help to solve the issue.

Vue equivalent of setTimeout?

please use setInterval like below:

    setInterval(()=>{this.checkOrder()},2000);

Solving "adb server version doesn't match this client" error

For those of you that have HTC Sync installed, uninstalling the application fixed this problem for me.

Pass multiple parameters to rest API - Spring

Yes its possible to pass JSON object in URL

queryString = "{\"left\":\"" + params.get("left") + "}";
 httpRestTemplate.exchange(
                    Endpoint + "/A/B?query={queryString}",
                    HttpMethod.GET, entity, z.class, queryString);

org.springframework.web.client.HttpClientErrorException: 400 Bad Request

This is what worked for me. Issue is earlier I didn't set Content Type(header) when I used exchange method.

MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
map.add("param1", "123");
map.add("param2", "456");
map.add("param3", "789");
map.add("param4", "123");
map.add("param5", "456");

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

final HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<MultiValueMap<String, String>>(map ,
        headers);
JSONObject jsonObject = null;

try {
    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<String> responseEntity = restTemplate.exchange(
            "https://url", HttpMethod.POST, entity,
            String.class);

    if (responseEntity.getStatusCode() == HttpStatus.CREATED) {
        try {
            jsonObject = new JSONObject(responseEntity.getBody());
        } catch (JSONException e) {
            throw new RuntimeException("JSONException occurred");
        }
    }
  } catch (final HttpClientErrorException httpClientErrorException) {
        throw new ExternalCallBadRequestException();
  } catch (HttpServerErrorException httpServerErrorException) {
        throw new ExternalCallServerErrorException(httpServerErrorException);
  } catch (Exception exception) {
        throw new ExternalCallServerErrorException(exception);
    }

ExternalCallBadRequestException and ExternalCallServerErrorException are the custom exceptions here.

Note: Remember HttpClientErrorException is thrown when a 4xx error is received. So if the request you send is wrong either setting header or sending wrong data, you could receive this exception.

java.lang.IllegalArgumentException: No converter found for return value of type

@EnableWebMvc annotation on config class resolved my problem. (Spring 5, no web.xml, initialized by AbstractAnnotationConfigDispatcherServletInitializer)

disable viewport zooming iOS 10+ safari?

I came up with a pretty naive solution, but it seems to work. My goal was to prevent accidental double-taps to be interpreted as zoom in, while keeping pinch to zoom working for accessibility.

The idea is in measuring time between the first touchstart and second touchend in a double tap and then interpreting the last touchend as click if the delay is too small. While preventing accidental zooming, this method seems to keep list scrolling unaffected, which is nice. Not sure if I haven't missed anything though.

let preLastTouchStartAt = 0;
let lastTouchStartAt = 0;
const delay = 500;

document.addEventListener('touchstart', () => {
  preLastTouchStartAt = lastTouchStartAt;
  lastTouchStartAt = +new Date();
});
document.addEventListener('touchend', (event) => {
  const touchEndAt = +new Date();
  if (touchEndAt - preLastTouchStartAt < delay) {
    event.preventDefault();
    event.target.click();
  }
});

Inspired by a gist from mutewinter and Joseph's answer.

How to get request URL in Spring Boot RestController

Add a parameter of type UriComponentsBuilder to your controller method. Spring will give you an instance that's preconfigured with the URI for the current request, and you can then customize it (such as by using MvcUriComponentsBuilder.relativeTo to point at a different controller using the same prefix).

Why does flexbox stretch my image rather than retaining aspect ratio?

The key attribute is align-self: center:

_x000D_

.container {_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
}_x000D_
_x000D_
img {_x000D_
  max-width: 100%;_x000D_
}_x000D_
_x000D_
img.align-self {_x000D_
  align-self: center;_x000D_
}

_x000D_

<div class="container">_x000D_
    <p>Without align-self:</p>_x000D_
    <img src="http://i.imgur.com/NFBYJ3hs.jpg" />_x000D_
    <p>With align-self:</p>_x000D_
    <img class="align-self" src="http://i.imgur.com/NFBYJ3hs.jpg" />_x000D_
</div>

_x000D_

JPA Hibernate Persistence exception [PersistenceUnit: default] Unable to build Hibernate SessionFactory

I found some issue about that kind of error

Database username or password not match in the mysql or other other database. Please set application.properties like this

  
# ===============================
# = DATA SOURCE
# ===============================
# Set here configurations for the database connection
# Connection url for the database please let me know "[email protected]"
spring.datasource.url = jdbc:mysql://localhost:3306/bookstoreapiabc
# Username and secret
spring.datasource.username = root
spring.datasource.password =
# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# ===============================
# = JPA / HIBERNATE
# ===============================
# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager).
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update): with "update" the database
# schema will be automatically updated accordingly to java entities found in
# the project
spring.jpa.hibernate.ddl-auto = update
# Allows Hibernate to generate SQL optimized for a particular DBMS
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

Issue no 2.

Your local server has two database server and those database server conflict. this conflict like this mysql server & xampp or lampp or wamp server. Please one of the database like mysql server because xampp or lampp server automatically install mysql server on this machine

WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for jquery

To fix this problem on specific page need to set some validation settings when page loading. Write code below in Page_Load() method:

protected void Page_Load(object sender, EventArgs e)
    {
        ValidationSettings.UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
    }

Its work for me in .NET 4.5

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'demoRestController'

Your DemoApplication class is in the com.ag.digital.demo.boot package and your LoginBean class is in the com.ag.digital.demo.bean package. By default components (classes annotated with @Component) are found if they are in the same package or a sub-package of your main application class DemoApplication. This means that LoginBean isn't being found so dependency injection fails.

There are a couple of ways to solve your problem:

Move LoginBean into com.ag.digital.demo.boot or a sub-package.
Configure the packages that are scanned for components using the scanBasePackages attribute of @SpringBootApplication that should be on DemoApplication.

A few of other things that aren't causing a problem, but are not quite right with the code you've posted:

@Service is a specialisation of @Component so you don't need both on LoginBean
Similarly, @RestController is a specialisation of @Component so you don't need both on DemoRestController
DemoRestController is an unusual place for @EnableAutoConfiguration. That annotation is typically found on your main application class (DemoApplication) either directly or via @SpringBootApplication which is a combination of @ComponentScan, @Configuration, and @EnableAutoConfiguration.

How to configure CORS in a Spring Boot + Spring Security application?

If you are using Spring Security, you can do the following to ensure that CORS requests are handled first:

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            // by default uses a Bean by the name of corsConfigurationSource
            .cors().and()
            ...
    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("https://example.com"));
        configuration.setAllowedMethods(Arrays.asList("GET","POST"));
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}

See Spring 4.2.x CORS for more information.

Without Spring Security this will work:

@Bean
public WebMvcConfigurer corsConfigurer() {
    return new WebMvcConfigurer() {
        @Override
        public void addCorsMappings(CorsRegistry registry) {
            registry.addMapping("/**")
                    .allowedOrigins("*")
                    .allowedMethods("GET", "PUT", "POST", "PATCH", "DELETE", "OPTIONS");
        }
    };
}

How to prevent "The play() request was interrupted by a call to pause()" error?

When you see an error with Uncaught (in promise) This just means that you need to handle the promise with a .catch() In this case, .play() returns a promise. You can decide if you want to log a message, run some code, or do nothing, but as long as you have the .catch() the error will go away.

var n = new Audio();
n.pause();
n.currentTime = 0;
n.play().catch(function(e) {
  // console.log('There was an error', e);
});

When should I use curly braces for ES6 import?

The curly braces ({}) are used to import named bindings and the concept behind it is destructuring assignment

A simple demonstration of how import statement works with an example can be found in my own answer to a similar question at When do we use '{ }' in javascript imports?.

The number of method references in a .dex file cannot exceed 64k API 17

In android/app/build.gradle

android {

compileSdkVersion 23

 buildToolsVersion '23.0.0'

    defaultConfig {
        applicationId "com.dkm.example"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    }

Put this inside your defaultConfig:

multiDexEnabled true

it works for me

Failed to load ApplicationContext (with annotation)

In my case, I had to do the following while running with Junit5

@SpringBootTest(classes = {abc.class}) @ExtendWith(SpringExtension.class

Here abc.class was the class that was being tested

Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

I got the same error and changing the following

SessionFactory sessionFactory =
    new Configuration().configure().buildSessionFactory();

to this

SessionFactory sessionFactory =
    new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();

worked for me.

Execution failed for task ':app:processDebugResources' even with latest build tools

I changed the target=android-26 to target=android-23

project.properties

this works great for me.

How do I create a singleton service in Angular 2?

Here is a working example with Angular version 2.3. Just call the constructor of the service the stand way like this constructor(private _userService:UserService) . And it will create a singleton for the app.

user.service.ts

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Rx';
import { Subject }    from 'rxjs/Subject';
import { User } from '../object/user';


@Injectable()
export class UserService {
    private userChangedSource;
    public observableEvents;
    loggedUser:User;

    constructor() {
       this.userChangedSource = new Subject<any>();
       this.observableEvents = this.userChangedSource.asObservable();
    }

    userLoggedIn(user:User) {
        this.loggedUser = user;
        this.userChangedSource.next(user);
    }

    ...
}

app.component.ts

import { Component } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { UserService } from '../service/user.service';
import { User } from '../object/user';

@Component({
    selector: 'myApp',
    templateUrl: './app.component.html'
})
export class AppComponent implements OnInit {
    loggedUser:User;

    constructor(private _userService:UserService) { 
        this._userService.observableEvents.subscribe(user => {
                this.loggedUser = user;
                console.log("event triggered");
        });
    }
    ...
}

Android Error Building Signed APK: keystore.jks not found for signing config 'externalOverride'

For people that have tried above,try generating the key with the -keypass and -storepass options as I was only inputting one of the passwords when running it like the React Native docs have you. This caused it to error out when trying to build.

keytool -keypass PASSWORD1 -storepass PASSWORD2 -genkeypair -v -keystore release2.keystore -alias release2 -keyalg RSA -keysize 2048 -validity 10000

Could not autowire field:RestTemplate in Spring boot application

If a TestRestTemplate is a valid option in your unit test, this documentation might be relevant

http://docs.spring.io/spring-boot/docs/1.4.1.RELEASE/reference/htmlsingle/#boot-features-rest-templates-test-utility

Short answer: if using

@SpringBootTest(webEnvironment=WebEnvironment.RANDOM_PORT)

then @Autowired will work. If using

@SpringBootTest(webEnvironment=WebEnvironment.MOCK)

then create a TestRestTemplate like this

private TestRestTemplate template = new TestRestTemplate();

Violation of PRIMARY KEY constraint. Cannot insert duplicate key in object

I was getting the same error on a restored database when I tried to insert a new record using the EntityFramework. It turned out that the Indentity/Seed was screwing things up.

Using a reseed command fixed it.

DBCC CHECKIDENT ('[Prices]', RESEED, 4747030);GO

The request was rejected because no multipart boundary was found in springboot

When I use postman to send a file which is 5.6M to an external network, I faced the same issue. The same action is succeeded on my own computer and local testing environment.

After checking all the server configs and HTTP headers, I found that the reason is Postman may have some trouble simulating requests to external HTTP requests. Finally, I did the sendfile request on the chrome HTML page successfully. Just as a reference :)

download a file from Spring boot rest service

    @GetMapping("/downloadfile/{productId}/{fileName}")
public ResponseEntity<Resource> downloadFile(@PathVariable(value = "productId") String productId,
        @PathVariable String fileName, HttpServletRequest request) {
    // Load file as Resource
    Resource resource;

    String fileBasePath = "C:\\Users\\v_fzhang\\mobileid\\src\\main\\resources\\data\\Filesdown\\" + productId
            + "\\";
    Path path = Paths.get(fileBasePath + fileName);
    try {
        resource = new UrlResource(path.toUri());
    } catch (MalformedURLException e) {
        e.printStackTrace();
        return null;
    }

    // Try to determine file's content type
    String contentType = null;
    try {
        contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
    } catch (IOException ex) {
        System.out.println("Could not determine file type.");
    }

    // Fallback to the default content type if type could not be determined
    if (contentType == null) {
        contentType = "application/octet-stream";
    }

    return ResponseEntity.ok().contentType(MediaType.parseMediaType(contentType))
            .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
            .body(resource);
}

To test it, use postman

http://localhost:8080/api/downloadfile/GDD/1.zip

XMLHttpRequest cannot load XXX No 'Access-Control-Allow-Origin' header

As this isn't mentioned in the accepted answer.

This is not the case for this exact question, but might help others that search for that problem
This is something you can do in your client-code to prevent CORS errors in some cases.

You can make use of Simple Requests.
In order to perform a 'Simple Requests' the request needs to meet several conditions. E.g. only allowing POST, GET and HEAD method, as well as only allowing some given Headers (you can find all conditions here).

If your client code does not explicit set affected Headers (e.g. "Accept") with a fix value in the request it might occur that some clients do set these Headers automatically with some "non-standard" values causing the server to not accept it as Simple Request - which will give you a CORS error.

lodash: mapping array to object

Another way with lodash 4.17.2

_.chain(params)
    .keyBy('name')
    .mapValues('input')
    .value();

_.mapValues(_.keyBy(params, 'name'), 'input')

or with _.reduce

_.reduce(
    params,
    (acc, { name, input }) => ({ ...acc, [name]: input }),
    {}
)

Powershell: A positional parameter cannot be found that accepts argument "xxx"

I had this issue after converting my Write-Host cmdlets to Write-Information and I was missing quotes and parens around the parameters. The cmdlet signatures are evidently not the same.

Write-Host this is a good idea $here
Write-Information this is a good idea $here <=BAD

This is the cmdlet signature that corrected after spending 20-30 minutes digging down the function stack...

Write-Information ("this is a good idea $here") <=GOOD

Docker compose port mapping

It seems like the other answers here all misunderstood your question. If I understand correctly, you want to make requests to localhost:6379 (the default for redis) and have them be forwarded, automatically, to the same port on your redis container.

https://unix.stackexchange.com/a/101906/38639 helped me get to the right answer.

First, you'll need to install the nc command on your image. On CentOS, this package is called nmap-ncat, so in the example below, just replace this with the appropriate package if you are using a different OS as your base image.

Next, you'll need to tell it to run a certain command each time the container boots up. You can do this using CMD.

# Add this to your Dockerfile
RUN yum install -y --setopt=skip_missing_names_on_install=False nmap-ncat
COPY cmd.sh /usr/local/bin/cmd.sh
RUN chmod +x /usr/local/bin/cmd.sh
CMD ["/usr/local/bin/cmd.sh"]

Finally, we'll need to set up port-forwarding in cmd.sh. I found that nc, even with the -l and -k options, will occasionally terminate when a request is completed, so I'm using a while-loop to ensure that it's always running.

# cmd.sh
#! /usr/bin/env bash

while nc -l -p 6379 -k -c "nc redis 6379" || true; do true; done &

tail -f /dev/null # Or any other command that never exits

How do I download a file with Angular2 or greater

I share the solution that helped me (any improvement is greatly appreciated)

On your service 'pservice' :

getMyFileFromBackend(typeName: string): Observable<any>{
    let param = new URLSearchParams();
    param.set('type', typeName);
    // setting 'responseType: 2' tells angular that you are loading an arraybuffer
    return this.http.get(http://MYSITE/API/FILEIMPORT, {search: params, responseType: 2})
            .map(res => res.text())
            .catch((error:any) => Observable.throw(error || 'Server error'));
}

Component Part :

downloadfile(type: string){
   this.pservice.getMyFileFromBackend(typename).subscribe(
                    res => this.extractData(res),
                    (error:any) => Observable.throw(error || 'Server error')
                );
}

extractData(res: string){
    // transforme response to blob
    let myBlob: Blob = new Blob([res], {type: 'application/vnd.oasis.opendocument.spreadsheet'}); // replace the type by whatever type is your response

    var fileURL = URL.createObjectURL(myBlob);
    // Cross your fingers at this point and pray whatever you're used to pray
    window.open(fileURL);
}

On the component part, you call the service without subscribing to a response. The subscribe for a complete list of openOffice mime types see : http://www.openoffice.org/framework/documentation/mimetypes/mimetypes.html

Spring RequestMapping for controllers that produce and consume JSON

You can use the @RestController instead of @Controller annotation.

Text in a flex container doesn't wrap in IE11

Why use a complicated solution if a simple one works too?

.child {
  white-space: normal;
}

Spring CORS No 'Access-Control-Allow-Origin' header is present

as @Geoffrey pointed out, with spring security, you need a different approach as described here: Spring Boot Security CORS

Remove all of x axis labels in ggplot

You have to set to element_blank() in theme() elements you need to remove

ggplot(data = diamonds, mapping = aes(x = clarity)) + geom_bar(aes(fill = cut))+
  theme(axis.title.x=element_blank(),
        axis.text.x=element_blank(),
        axis.ticks.x=element_blank())

No matching client found for package name (Google Analytics) - multiple productFlavors & buildTypes

Whenever you create or update package name Make sure your package name is exactly the same [Upper case and lower case matters]

Do below step.

1). Check applicationId in App level gradle file,

2). Check package_name in your google-services.json file,

3). Check package in your AndroidManifest file

and for full confirmation make sure that your working package directory name i.e.("com.example.app") is also the same.

EDIT [ Any one who is facing this issue in productFlavour scenario, go check out Droid Chris's Solution ]

How to pass List<String> in post method using Spring MVC?

I had the same use case, You can change your method defination in the following way :

@RequestMapping(value = "/saveFruits", method = RequestMethod.POST, 
    consumes = "application/json")
@ResponseBody
public ResultObject saveFruits(@RequestBody Map<String,List<String>> fruits) {
    ..
}

The only problem is it accepts any key in place of "fruits" but You can easily get rid of a wrapper if it is not big functionality.

Http Post request with content type application/x-www-form-urlencoded not working in Spring

Remove @ResponseBody annotation from your use parameters in method. Like this;

   @Autowired
    ProjectService projectService;

    @RequestMapping(path = "/add", method = RequestMethod.POST)
    public ResponseEntity<Project> createNewProject(Project newProject){
        Project project = projectService.save(newProject);

        return new ResponseEntity<Project>(project,HttpStatus.CREATED);
    }

Android Studio Gradle: Error:Execution failed for task ':app:processDebugGoogleServices'. > No matching client found for package

I found success using this configuration:

classpath 'com.android.tools.build:gradle:1.5.0'
classpath 'com.google.gms:google-services:2.0.0-alpha3'
//or use
//classpath 'com.android.tools.build:gradle:2.0.0-alpha6'

and

distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip

using 8.40 Google Play services. Alpha5 & Alpha6 gave the same 2.8 error you had, regardless of the distributionUrl being 2.10

How to manage exceptions thrown in filters in Spring?

Just to complement the other fine answers provided, as I too recently wanted a single error/exception handling component in a simple SpringBoot app containing filters that may throw exceptions, with other exceptions potentially thrown from controller methods.

Fortunately, it seems there is nothing to prevent you from combining your controller advice with an override of Spring's default error handler to provide consistent response payloads, allow you to share logic, inspect exceptions from filters, trap specific service-thrown exceptions, etc.

E.g.


@ControllerAdvice
@RestController
public class GlobalErrorHandler implements ErrorController {

  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler(ValidationException.class)
  public Error handleValidationException(
      final ValidationException validationException) {
    return new Error("400", "Incorrect params"); // whatever
  }

  @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
  @ExceptionHandler(Exception.class)
  public Error handleUnknownException(final Exception exception) {
    return new Error("500", "Unexpected error processing request");
  }

  @RequestMapping("/error")
  public ResponseEntity handleError(final HttpServletRequest request,
      final HttpServletResponse response) {

    Object exception = request.getAttribute("javax.servlet.error.exception");

    // TODO: Logic to inspect exception thrown from Filters...
    return ResponseEntity.badRequest().body(new Error(/* whatever */));
  }

  @Override
  public String getErrorPath() {
    return "/error";
  }

}

How do I add an active class to a Link from React Router?

Its very easy to do that, react-router-dom provides all.

_x000D_

import React from 'react';_x000D_
import { matchPath, withRouter } from 'react-router';_x000D_
    _x000D_
class NavBar extends React.Component {_x000D_
  render(){_x000D_
    return(_x000D_
       <ul className="sidebar-menu">_x000D_
      <li className="header">MAIN NAVIGATION</li>_x000D_
      <li className={matchPath(this.props.location.pathname, { path: "/dashboard" }) ? 'active' : ''}><Link to="dashboard"><i className="fa fa-dashboard"></i> _x000D_
        <span>Dashboard</span></Link></li>_x000D_
      <li className={matchPath(this.props.location.pathname, { path: "/email_lists" }) ? 'active' : ''}><Link to="email_lists"><i className="fa fa-envelope-o"></i> _x000D_
        <span>Email Lists</span></Link></li>_x000D_
      <li className={matchPath(this.props.location.pathname, { path: "/billing" }) ? 'active' : ''}><Link to="billing"><i className="fa fa-credit-card"></i> _x000D_
        <span>Buy Verifications</span></Link></li>_x000D_
    </ul>_x000D_
      )_x000D_
   }_x000D_
}_x000D_
    _x000D_
export default withRouter(NavBar);

_x000D_

Wrapping You Navigation Component with withRouter() HOC will provide few props to your component: 1. match 2. history 3. location

here i used matchPath() method from react-router to compare the paths and decide if the 'li' tag should get "active" class name or not. and Im accessing the location from this.props.location.pathname.

changing the path name in props will happen when our link is clicked, and location props will get updated NavBar also get re-rendered and active style will get applied

android : Error converting byte to dex

After I upgraded to Android Studio 2.1, the next time I rebooted, I was asked to upgrade to JDK 1.8. After I upgraded to JDK 1.8, that's when my AS project had trouble compiling. I followed all of the suggestions in this page, but to no avail. Finally, I decided to check the version of JDK that my project was using, and to my surprise, it somehow was pointing to JDK 1.8!

Moral of the story: If compileSdkVersion<=23, double check that your project is using JDK1.7 as follows:

Right Mouse on top level module
Project STructure => JDK Location

json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

I had similar error: "Expecting value: line 1 column 1 (char 0)"

It helped for me to add "myfile.seek(0)", move the pointer to the 0 character

with open(storage_path, 'r') as myfile:
if len(myfile.readlines()) != 0:
    myfile.seek(0)
    Bank_0 = json.load(myfile)

Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported for @RequestBody MultiValueMap

Add a header to your request to set content type to application/json

curl -H 'Content-Type: application/json' -s -XPOST http://your.domain.com/ -d YOUR_JSON_BODY

this way spring knows how to parse the content.

"unexpected token import" in Nodejs5 and babel?

install --> "npm i --save-dev babel-cli babel-preset-es2015 babel-preset-stage-0"

next in package.json file add in scripts "start": "babel-node server.js"

    {
  "name": "node",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "dependencies": {
    "body-parser": "^1.18.2",
    "express": "^4.16.2",
    "lodash": "^4.17.4",
    "mongoose": "^5.0.1"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "babel-node server.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

and create file for babel , in root ".babelrc"

    {
    "presets":[
        "es2015",
        "stage-0"
    ]
}

and run npm start in terminal

Gradle Error:Execution failed for task ':app:processDebugGoogleServices'

I'v got a same issue. but Now I'm fixed.

You should delete a line apply plugin: 'com.google.gms.google-services'

because "com.android.application" package already has same package.

How to change the MySQL root account password on CentOS7?

For me work like this: 1. Stop mysql: systemctl stop mysqld

Set the mySQL environment option systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
Start mysql usig the options you just set systemctl start mysqld
Login as root mysql -u root
After login I use FLUSH PRIVILEGES; tell the server to reload the grant tables so that account-management statements work. If i don't do that i receive this error trying to update the password: "Can't find any matching row in the user table"

Boto3 Error: botocore.exceptions.NoCredentialsError: Unable to locate credentials

Create an S3 client object with your credentials

AWS_S3_CREDS = {
    "aws_access_key_id":"your access key", # os.getenv("AWS_ACCESS_KEY")
    "aws_secret_access_key":"your aws secret key" # os.getenv("AWS_SECRET_KEY")
}
s3_client = boto3.client('s3',**AWS_S3_CREDS)

It is always good to get credentials from os environment

To set Environment variables run the following commands in terminal

if linux or mac

$ export AWS_ACCESS_KEY="aws_access_key"
$ export AWS_SECRET_KEY="aws_secret_key"

if windows

c:System\> set AWS_ACCESS_KEY="aws_access_key"
c:System\> set AWS_SECRET_KEY="aws_secret_key"

No 'Access-Control-Allow-Origin' header is present on the requested resource - Resteasy

Seems your resource POSTmethod won't get hit as @peeskillet mention. Most probably your ~POST~ request won't work, because it may not be a simple request. The only simple requests are GET, HEAD or POST and request headers are simple(The only simple headers are Accept, Accept-Language, Content-Language, Content-Type= application/x-www-form-urlencoded, multipart/form-data, text/plain).

Since in you already add Access-Control-Allow-Origin headers to your Response, you can add new OPTIONS method to your resource class.

    @OPTIONS
@Path("{path : .*}")
public Response options() {
    return Response.ok("")
            .header("Access-Control-Allow-Origin", "*")
            .header("Access-Control-Allow-Headers", "origin, content-type, accept, authorization")
            .header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD")
            .header("Access-Control-Max-Age", "2000")
            .build();
}

HikariCP - connection is not available

From stack trace:

HikariPool: Timeout failure pool HikariPool-0 stats (total=20, active=20, idle=0, waiting=0) Means pool reached maximum connections limit set in configuration.

The next line: HikariPool-0 - Connection is not available, request timed out after 30000ms. Means pool waited 30000ms for free connection but your application not returned any connection meanwhile.

Mostly it is connection leak (connection is not closed after borrowing from pool), set leakDetectionThreshold to the maximum value that you expect SQL query would take to execute.

otherwise, your maximum connections 'at a time' requirement is higher than 20 !

Add views below toolbar in CoordinatorLayout

To use collapsing top ToolBar or using ScrollFlags of your own choice we can do this way:From Material Design get rid of FrameLayout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

<androidx.coordinatorlayout.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleGravity="top"
            app:layout_scrollFlags="scroll|enterAlways">


        <androidx.appcompat.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin">

            <ImageView
                android:id="@+id/ic_back"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/ic_arrow_back" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="back"
                android:textSize="16sp"
                android:textStyle="bold" />

        </androidx.appcompat.widget.Toolbar>


        </com.google.android.material.appbar.CollapsingToolbarLayout>
    </com.google.android.material.appbar.AppBarLayout>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/post_details_recycler"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="5dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

How to set base url for rest in spring boot?

For Boot 2.0.0+ this works for me: server.servlet.context-path = /api

How to return JSON data from spring Controller using @ResponseBody

You also need to be sure that returned bean is not empty (and can be serialized by Jackson). In my particular case I tried to return an instance of an object without getters and setters and without any jackson annotation and with fields equals to null. I got following message:

com.fasterxml.jackson.databind.JsonMappingException:
    No serializer found for class com.foo.bar.Baz and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) )

Add my custom http header to Spring RestTemplate request / extend RestTemplate

If the goal is to have a reusable RestTemplate which is in general useful for attaching the same header to a series of similar request a org.springframework.boot.web.client.RestTemplateCustomizer parameter can be used with a RestTemplateBuilder:

 String accessToken= "<the oauth 2 token>";
 RestTemplate restTemplate = new RestTemplateBuilder(rt-> rt.getInterceptors().add((request, body, execution) -> {
        request.getHeaders().add("Authorization", "Bearer "+accessToken);
        return execution.execute(request, body);
    })).build();

Mapping list in Yaml to list of objects in Spring Boot

You don't need constructors
You don't need to annotate inner classes
RefreshScope have some problems when using with @Configuration. Please see this github issue

Change your class like this:

@ConfigurationProperties(prefix = "available-payment-channels-list")
@Configuration
public class AvailableChannelsConfiguration {

    private String xyz;
    private List<ChannelConfiguration> channelConfigurations;

    // getters, setters

    public static class ChannelConfiguration {
        private String name;
        private String companyBankAccount;

        // getters, setters
    }

}

Python pandas: how to specify data types when reading an Excel file?

Starting with v0.20.0, the dtype keyword argument in read_excel() function could be used to specify the data types that needs to be applied to the columns just like it exists for read_csv() case.

Using converters and dtype arguments together on the same column name would lead to the latter getting shadowed and the former gaining preferance.

1) Inorder for it to not interpret the dtypes but rather pass all the contents of it's columns as they were originally in the file before, we could set this arg to str or object so that we don't mess up our data. (one such case would be leading zeros in numbers which would be lost otherwise)

pd.read_excel('file_name.xlsx', dtype=str)            # (or) dtype=object

2) It even supports a dict mapping wherein the keys constitute the column names and values it's respective data type to be set especially when you want to alter the dtype for a subset of all the columns.

# Assuming data types for `a` and `b` columns to be altered
pd.read_excel('file_name.xlsx', dtype={'a': np.float64, 'b': np.int32})

Detect click outside React component

Add an onClick handler to your top level container and increment a state value whenever the user clicks within. Pass that value to the relevant component and whenever the value changes you can do work.

In this case we're calling this.closeDropdown() whenever the clickCount value changes.

The incrementClickCount method fires within the .app container but not the .dropdown because we use event.stopPropagation() to prevent event bubbling.

Your code may end up looking something like this:

class App extends Component {
    constructor(props) {
        super(props);
        this.state = {
            clickCount: 0
        };
    }
    incrementClickCount = () => {
        this.setState({
            clickCount: this.state.clickCount + 1
        });
    }
    render() {
        return (
            <div className="app" onClick={this.incrementClickCount}>
                <Dropdown clickCount={this.state.clickCount}/>
            </div>
        );
    }
}
class Dropdown extends Component {
    constructor(props) {
        super(props);
        this.state = {
            open: false
        };
    }
    componentDidUpdate(prevProps) {
        if (this.props.clickCount !== prevProps.clickCount) {
            this.closeDropdown();
        }
    }
    toggleDropdown = event => {
        event.stopPropagation();
        return (this.state.open) ? this.closeDropdown() : this.openDropdown();
    }
    render() {
        return (
            <div className="dropdown" onClick={this.toggleDropdown}>
                ...
            </div>
        );
    }
}

WARNING: Exception encountered during context initialization - cancelling refresh attempt

To closed ideas,
To remove all folder and file C:/Users/UserName/.m2/org/*,
Open ideas and update Maven project,(right click on project -> maven->update maven project)
After that update the project.

How return error message in spring mvc @Controller

return new ResponseEntity<>(GenericResponseBean.newGenericError("Error during the calling the service", -1L), HttpStatus.EXPECTATION_FAILED);

Remove git mapping in Visual Studio 2015

Connect to a different repository (I tried with a TFS repository), then go to Manage Connections, right click the Git repository and you might be able to remove it.

But you still have to manually remove the .git folder and files from your project path before opening the solution again.

Spring - No EntityManager with actual transaction available for current thread - cannot reliably process 'persist' call

boardRepo.deleteByBoardId(id);

Faced the same issue. GOT javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread

I resolved it by adding @Transactional annotation above the controller/service.

How do I retrieve query parameters in Spring Boot?

In Spring boot: 2.1.6, you can use like below:

    @GetMapping("/orders")
    @ApiOperation(value = "retrieve orders", response = OrderResponse.class, responseContainer = "List")
    public List<OrderResponse> getOrders(
            @RequestParam(value = "creationDateTimeFrom", required = true) String creationDateTimeFrom,
            @RequestParam(value = "creationDateTimeTo", required = true) String creationDateTimeTo,
            @RequestParam(value = "location_id", required = true) String location_id) {

        // TODO...

        return response;

@ApiOperation is an annotation that comes from Swagger api, It is used for documenting the apis.

What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?

^{This answer is community wiki. If you feel it could be made better, feel free to edit it!}

Background: What’s an Optional?

In Swift, Optional<Wrapped> is an option type: it can contain any value from the original ("Wrapped") type, or no value at all (the special value nil). An optional value must be unwrapped before it can be used.

Optional is a generic type, which means that Optional<Int> and Optional<String> are distinct types — the type inside <> is called the Wrapped type. Under the hood, an Optional is an enum with two cases: .some(Wrapped) and .none, where .none is equivalent to nil.

Optionals can be declared using the named type Optional<T>, or (most commonly) as a shorthand with a ? suffix.

var anInt: Int = 42
var anOptionalInt: Int? = 42
var anotherOptionalInt: Int?  // `nil` is the default when no value is provided
var aVerboseOptionalInt: Optional<Int>  // equivalent to `Int?`

anOptionalInt = nil // now this variable contains nil instead of an integer

Optionals are a simple yet powerful tool to express your assumptions while writing code. The compiler can use this information to prevent you from making mistakes. From The Swift Programming Language:

Swift is a type-safe language, which means the language helps you to be clear about the types of values your code can work with. If part of your code requires a String, type safety prevents you from passing it an Int by mistake. Likewise, type safety prevents you from accidentally passing an optional String to a piece of code that requires a non-optional String. Type safety helps you catch and fix errors as early as possible in the development process.

Some other programming languages also have generic option types: for example, Maybe in Haskell, option in Rust, and optional in C++17.

In programming languages without option types, a particular "sentinel" value is often used to indicate the absence of a valid value. In Objective-C, for example, nil (the null pointer) represents the lack of an object. For primitive types such as int, a null pointer can't be used, so you would need either a separate variable (such as value: Int and isValid: Bool) or a designated sentinel value (such as -1 or INT_MIN). These approaches are error-prone because it's easy to forget to check isValid or to check for the sentinel value. Also, if a particular value is chosen as the sentinel, that means it can no longer be treated as a valid value.

Option types such as Swift's Optional solve these problems by introducing a special, separate nil value (so you don't have to designate a sentinel value), and by leveraging the strong type system so the compiler can help you remember to check for nil when necessary.

Why did I get “fatal error: unexpectedly found nil while unwrapping an Optional value”?

In order to access an optional’s value (if it has one at all), you need to unwrap it. An optional value can be unwrapped safely or forcibly. If you force-unwrap an optional, and it didn't have a value, your program will crash with the above message.

Xcode will show you the crash by highlighting a line of code. The problem occurs on this line.

This crash can occur with two different kinds of force-unwrap:

1. Explicit Force Unwrapping

This is done with the ! operator on an optional. For example:

let anOptionalString: String?
print(anOptionalString!) // <- CRASH

Fatal error: Unexpectedly found nil while unwrapping an Optional value

As anOptionalString is nil here, you will get a crash on the line where you force unwrap it.

2. Implicitly Unwrapped Optionals

These are defined with a !, rather than a ? after the type.

var optionalDouble: Double!   // this value is implicitly unwrapped wherever it's used

These optionals are assumed to contain a value. Therefore whenever you access an implicitly unwrapped optional, it will automatically be force unwrapped for you. If it doesn’t contain a value, it will crash.

print(optionalDouble) // <- CRASH

Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

In order to work out which variable caused the crash, you can hold ? while clicking to show the definition, where you might find the optional type.

IBOutlets, in particular, are usually implicitly unwrapped optionals. This is because your xib or storyboard will link up the outlets at runtime, after initialization. You should therefore ensure that you’re not accessing outlets before they're loaded in. You also should check that the connections are correct in your storyboard/xib file, otherwise the values will be nil at runtime, and therefore crash when they are implicitly unwrapped. When fixing connections, try deleting the lines of code that define your outlets, then reconnect them.

When should I ever force unwrap an Optional?

Explicit Force Unwrapping

As a general rule, you should never explicitly force unwrap an optional with the ! operator. There may be cases where using ! is acceptable – but you should only ever be using it if you are 100% sure that the optional contains a value.

While there may be an occasion where you can use force unwrapping, as you know for a fact that an optional contains a value – there is not a single place where you cannot safely unwrap that optional instead.

Implicitly Unwrapped Optionals

These variables are designed so that you can defer their assignment until later in your code. It is your responsibility to ensure they have a value before you access them. However, because they involve force unwrapping, they are still inherently unsafe – as they assume your value is non-nil, even though assigning nil is valid.

You should only be using implicitly unwrapped optionals as a last resort. If you can use a lazy variable, or provide a default value for a variable – you should do so instead of using an implicitly unwrapped optional.

However, there are a few scenarios where implicitly unwrapped optionals are beneficial, and you are still able to use various ways of safely unwrapping them as listed below – but you should always use them with due caution.

How can I safely deal with Optionals?

The simplest way to check whether an optional contains a value, is to compare it to nil.

if anOptionalInt != nil {
    print("Contains a value!")
} else {
    print("Doesn’t contain a value.")
}

However, 99.9% of the time when working with optionals, you’ll actually want to access the value it contains, if it contains one at all. To do this, you can use Optional Binding.

Optional Binding

Optional Binding allows you to check if an optional contains a value – and allows you to assign the unwrapped value to a new variable or constant. It uses the syntax if let x = anOptional {...} or if var x = anOptional {...}, depending if you need to modify the value of the new variable after binding it.

For example:

if let number = anOptionalInt {
    print("Contains a value! It is \(number)!")
} else {
    print("Doesn’t contain a number")
}

What this does is first check that the optional contains a value. If it does, then the ‘unwrapped’ value is assigned to a new variable (number) – which you can then freely use as if it were non-optional. If the optional doesn’t contain a value, then the else clause will be invoked, as you would expect.

What’s neat about optional binding, is you can unwrap multiple optionals at the same time. You can just separate the statements with a comma. The statement will succeed if all the optionals were unwrapped.

var anOptionalInt : Int?
var anOptionalString : String?

if let number = anOptionalInt, let text = anOptionalString {
    print("anOptionalInt contains a value: \(number). And so does anOptionalString, it’s: \(text)")
} else {
    print("One or more of the optionals don’t contain a value")
}

Another neat trick is that you can also use commas to check for a certain condition on the value, after unwrapping it.

if let number = anOptionalInt, number > 0 {
    print("anOptionalInt contains a value: \(number), and it’s greater than zero!")
}

The only catch with using optional binding within an if statement, is that you can only access the unwrapped value from within the scope of the statement. If you need access to the value from outside of the scope of the statement, you can use a guard statement.

A guard statement allows you to define a condition for success – and the current scope will only continue executing if that condition is met. They are defined with the syntax guard condition else {...}.

So, to use them with an optional binding, you can do this:

guard let number = anOptionalInt else {
    return
}

^{(Note that within the guard body, you must use one of the control transfer statements in order to exit the scope of the currently executing code).}

If anOptionalInt contains a value, it will be unwrapped and assigned to the new number constant. The code after the guard will then continue executing. If it doesn’t contain a value – the guard will execute the code within the brackets, which will lead to transfer of control, so that the code immediately after will not be executed.

The real neat thing about guard statements is the unwrapped value is now available to use in code that follows the statement (as we know that future code can only execute if the optional has a value). This is a great for eliminating ‘pyramids of doom’ created by nesting multiple if statements.

For example:

guard let number = anOptionalInt else {
    return
}

print("anOptionalInt contains a value, and it’s: \(number)!")

Guards also support the same neat tricks that the if statement supported, such as unwrapping multiple optionals at the same time and using the where clause.

Whether you use an if or guard statement completely depends on whether any future code requires the optional to contain a value.

Nil Coalescing Operator

The Nil Coalescing Operator is a nifty shorthand version of the ternary conditional operator, primarily designed to convert optionals to non-optionals. It has the syntax a ?? b, where a is an optional type and b is the same type as a (although usually non-optional).

It essentially lets you say “If a contains a value, unwrap it. If it doesn’t then return b instead”. For example, you could use it like this:

let number = anOptionalInt ?? 0

This will define a number constant of Int type, that will either contain the value of anOptionalInt, if it contains a value, or 0 otherwise.

It’s just shorthand for:

let number = anOptionalInt != nil ? anOptionalInt! : 0

Optional Chaining

You can use Optional Chaining in order to call a method or access a property on an optional. This is simply done by suffixing the variable name with a ? when using it.

For example, say we have a variable foo, of type an optional Foo instance.

var foo : Foo?

If we wanted to call a method on foo that doesn’t return anything, we can simply do:

foo?.doSomethingInteresting()

If foo contains a value, this method will be called on it. If it doesn’t, nothing bad will happen – the code will simply continue executing.

^{(This is similar behaviour to sending messages to nil in Objective-C)}

This can therefore also be used to set properties as well as call methods. For example:

foo?.bar = Bar()

Again, nothing bad will happen here if foo is nil. Your code will simply continue executing.

Another neat trick that optional chaining lets you do is check whether setting a property or calling a method was successful. You can do this by comparing the return value to nil.

^{(This is because an optional value will return Void? rather than Void on a method that doesn’t return anything)}

For example:

if (foo?.bar = Bar()) != nil {
    print("bar was set successfully")
} else {
    print("bar wasn’t set successfully")
}

However, things become a little bit more tricky when trying to access properties or call methods that return a value. Because foo is optional, anything returned from it will also be optional. To deal with this, you can either unwrap the optionals that get returned using one of the above methods – or unwrap foo itself before accessing methods or calling methods that return values.

Also, as the name suggests, you can ‘chain’ these statements together. This means that if foo has an optional property baz, which has a property qux – you could write the following:

let optionalQux = foo?.baz?.qux

Again, because foo and baz are optional, the value returned from qux will always be an optional regardless of whether qux itself is optional.

`map` and `flatMap`

An often underused feature with optionals is the ability to use the map and flatMap functions. These allow you to apply non-optional transforms to optional variables. If an optional has a value, you can apply a given transformation to it. If it doesn’t have a value, it will remain nil.

For example, let’s say you have an optional string:

let anOptionalString:String?

By applying the map function to it – we can use the stringByAppendingString function in order to concatenate it to another string.

Because stringByAppendingString takes a non-optional string argument, we cannot input our optional string directly. However, by using map, we can use allow stringByAppendingString to be used if anOptionalString has a value.

For example:

var anOptionalString:String? = "bar"

anOptionalString = anOptionalString.map {unwrappedString in
    return "foo".stringByAppendingString(unwrappedString)
}

print(anOptionalString) // Optional("foobar")

However, if anOptionalString doesn’t have a value, map will return nil. For example:

var anOptionalString:String?

anOptionalString = anOptionalString.map {unwrappedString in
    return "foo".stringByAppendingString(unwrappedString)
}

print(anOptionalString) // nil

flatMap works similarly to map, except it allows you to return another optional from within the closure body. This means you can input an optional into a process that requires a non-optional input, but can output an optional itself.

`try!`

Swift's error handling system can be safely used with Do-Try-Catch:

do {
    let result = try someThrowingFunc() 
} catch {
    print(error)
}

If someThrowingFunc() throws an error, the error will be safely caught in the catch block.

The error constant you see in the catch block has not been declared by us - it's automatically generated by catch.

You can also declare error yourself, it has the advantage of being able to cast it to a useful format, for example:

do {
    let result = try someThrowingFunc()    
} catch let error as NSError {
    print(error.debugDescription)
}

Using try this way is the proper way to try, catch and handle errors coming from throwing functions.

There's also try? which absorbs the error:

if let result = try? someThrowingFunc() {
    // cool
} else {
    // handle the failure, but there's no error information available
}

But Swift's error handling system also provides a way to "force try" with try!:

let result = try! someThrowingFunc()

The concepts explained in this post also apply here: if an error is thrown, the application will crash.

You should only ever use try! if you can prove that its result will never fail in your context - and this is very rare.

Most of the time you will use the complete Do-Try-Catch system - and the optional one, try?, in the rare cases where handling the error is not important.

Resources

Stopping Docker containers by image name - Ubuntu

In my case --filter ancestor=<image-name> was not working, so the following command cleaned up the Docker container for me:

docker rm $(docker stop $(docker ps -a -q --filter "name=container_name_here" --format="{{.ID}}"))

Error resolving template "index", template might not exist or might not be accessible by any of the configured Template Resolvers

this make me success!

prefix: classpath:/templates/

check your application.yml

How to post object and List using postman

Try this one,

{
  "address": "colombo",
  "username": "hesh",
  "password": "123",
  "registetedDate": "2015-4-3",
  "firstname": "hesh",
  "contactNo": "07762",
  "accountNo": "16161",
  "lastName": "jay",
  "skill":[1436517454492,1436517476993]
}

Spring Boot: Cannot access REST Controller on localhost (404)

There are 2 method to overcome this

Place the bootup application at start of the package structure and rest all controller inside it.

Example :

package com.spring.boot.app; - You bootup application(i.e. Main Method -SpringApplication.run(App.class, args);)

You Rest Controller in with the same package structure Example : package com.spring.boot.app.rest;
Explicitly define the Controller in the Bootup package.

Method 1 is more cleaner.

YAML mapping values are not allowed in this context

This is valid YAML:

jobs:
 - name: A
   schedule: "0 0/5 * 1/1 * ? *"
   type: mongodb.cluster
   config:
     host: mongodb://localhost:27017/admin?replicaSet=rs
     minSecondaries: 2
     minOplogHours: 100
     maxSecondaryDelay: 120
 - name: B
   schedule: "0 0/5 * 1/1 * ? *"
   type: mongodb.cluster
   config:
     host: mongodb://localhost:27017/admin?replicaSet=rs
     minSecondaries: 2
     minOplogHours: 100
     maxSecondaryDelay: 120

Note, that every '-' starts new element in the sequence. Also, indentation of keys in the map should be exactly same.

Effect of using sys.path.insert(0, path) and sys.path(append) when loading modules

I'm quite a beginner in Python and I found the answer of Anand was very good but quite complicated to me, so I try to reformulate :

1) insert and append methods are not specific to sys.path and as in other languages they add an item into a list or array and :
* append(item) add item to the end of the list,
* insert(n, item) inserts the item at the nth position in the list (0 at the beginning, 1 after the first element, etc ...).

2) As Anand said, python search the import files in each directory of the path in the order of the path, so :
* If you have no file name collisions, the order of the path has no impact,
* If you look after a function already defined in the path and you use append to add your path, you will not get your function but the predefined one.

But I think that it is better to use append and not insert to not overload the standard behaviour of Python, and use non-ambiguous names for your files and methods.

How to detect tableView cell touched or clicked in swift

I screw up on the every time! Just make sure the tableView delegate and dataSource are declared in viewDidLoad. Then I normally populate a few arrays to simulate returned data and then take it from there!

//******** Populate Table with data ***********
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") as? SetupCellView
    cell?.ControllerLbl.text = ViewContHeading[indexPath.row]
    cell?.DetailLbl.text = ViewContDetail[indexPath.row]
    cell?.StartupImageImg.image = UIImage(named: ViewContImages[indexPath.row])
    return cell!
}

This application has no explicit mapping for /error

Main class need to be outside of your app packages tree structure. For example:

How do I install the babel-polyfill library?

First off, the obvious answer that no one has provided, you need to install Babel into your application:

npm install babel --save

(or babel-core if you instead want to require('babel-core/polyfill')).

Aside from that, I have a grunt task to transpile my es6 and jsx as a build step (i.e. I don't want to use babel/register, which is why I am trying to use babel/polyfill directly in the first place), so I'd like to put more emphasis on this part of @ssube's answer:

Make sure you require it at the entry-point to your application, before anything else is called

I ran into some weird issue where I was trying to require babel/polyfill from some shared environment startup file and I got the error the user referenced - I think it might have had something to do with how babel orders imports versus requires but I'm unable to reproduce now. Anyway, moving import 'babel/polyfill' as the first line in both my client and server startup scripts fixed the problem.

Note that if you instead want to use require('babel/polyfill') I would make sure all your other module loader statements are also requires and not use imports - avoid mixing the two. In other words, if you have any import statements in your startup script, make import babel/polyfill the first line in your script rather than require('babel/polyfill').

Remove duplicates from a dataframe in PySpark

It is not an import problem. You simply call .dropDuplicates() on a wrong object. While class of sqlContext.createDataFrame(rdd1, ...) is pyspark.sql.dataframe.DataFrame, after you apply .collect() it is a plain Python list, and lists don't provide dropDuplicates method. What you want is something like this:

 (df1 = sqlContext
     .createDataFrame(rdd1, ['column1', 'column2', 'column3', 'column4'])
     .dropDuplicates())

 df1.collect()

How can I switch word wrap on and off in Visual Studio Code?

Go to menu File → Preferences → User Settings.

It will open up Default Settings and settings.json automatically. Just add the following in the settings.json file and save it. This will overwrite the default settings.

// Place your settings in this file to overwrite the default settings
{ "editor.wrappingColumn": 0 }

Easiest way to use SVG in Android?

First you need to import svg files by following simple steps.

Right click on drawable
Click new
Select Vector Asset

If image is available in your computer then select local svg file. After that select the image path and an option to change the size of the image is also available at the right side of dialog if you want to . in this way svg image is imported in your project After that for using this image use the same procedure

@drawable/yourimagename

mongoError: Topology was destroyed

Just a minor addition to Gaafar's answer, it gave me a deprecation warning. Instead of on the server object, like this:

MongoClient.connect(MONGO_URL, {
    server: {
        reconnectTries: Number.MAX_VALUE,
        reconnectInterval: 1000
    }
});

It can go on the top level object. Basically, just take it out of the server object and put it in the options object like this:

MongoClient.connect(MONGO_URL, {
    reconnectTries: Number.MAX_VALUE,
    reconnectInterval: 1000
});

Spring MVC - How to return simple String as JSON in Rest Controller

You can easily return JSON with String in property response as following

@RestController
public class TestController {
    @RequestMapping(value = "/getString", produces = MediaType.APPLICATION_JSON_VALUE)
    public Map getString() {
        return Collections.singletonMap("response", "Hello World");
    }
}

Flexbox: how to get divs to fill up 100% of the container width without wrapping?

You can use the shorthand flex property and set it to

flex: 0 0 100%;

That's flex-grow, flex-shrink, and flex-basis in one line. Flex shrink was described above, flex grow is the opposite, and flex basis is the size of the container.

Spring MVC 4: "application/json" Content Type is not being set correctly

Not exactly for this OP, but for those who encountered 404 and cannot set response content-type to "application/json" (any content-type). One possibility is a server actually responds 406 but explorer (e.g., chrome) prints it as 404.

If you do not customize message converter, spring would use AbstractMessageConverterMethodProcessor.java. It would run:

List<MediaType> requestedMediaTypes = getAcceptableMediaTypes(request);
List<MediaType> producibleMediaTypes = getProducibleMediaTypes(request, valueType, declaredType);

and if they do not have any overlapping (the same item), it would throw HttpMediaTypeNotAcceptableException and this finally causes 406. No matter if it is an ajax, or GET/POST, or form action, if the request uri ends with a .html or any suffix, the requestedMediaTypes would be "text/[that suffix]", and this conflicts with producibleMediaTypes, which is usually:

"application/json"  
"application/xml"   
"text/xml"          
"application/*+xml" 
"application/json"  
"application/*+json"
"application/json"  
"application/*+json"
"application/xml"   
"text/xml"          
"application/*+xml"
"application/xml"  
"text/xml"         
"application/*+xml"

Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved

In my case my problem was that I was using an older version of NetBeans. The Maven repository removed an http reference, but the embedded Maven in Netbeans had that http reference hard-coded. I was really confused at first because my pom.xml referenced the proper https://repo.maven.apache.org/maven2.

Fixing it was pretty simple. I downloaded the latest zip archive of Maven from the following location and extracted it to my machine: https://maven.apache.org/download.cgi

Within Netbeans at Tools -> Options -> Java -> Maven on the "Execution" section I set "Maven Home" to the newly extracted zip file location.

Now I could build my project....

How to disable spring security for particular url

This may be not the full answer to your question, however if you are looking for way to disable csrf protection you can do:

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/web/admin/**").hasAnyRole(ADMIN.toString(), GUEST.toString())
                .anyRequest().permitAll()
                .and()
                .formLogin().loginPage("/web/login").permitAll()
                .and()
                .csrf().ignoringAntMatchers("/contact-email")
                .and()
                .logout().logoutUrl("/web/logout").logoutSuccessUrl("/web/").permitAll();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
                .withUser("admin").password("admin").roles(ADMIN.toString())
                .and()
                .withUser("guest").password("guest").roles(GUEST.toString());
    }

}

I have included full configuration but the key line is:

.csrf().ignoringAntMatchers("/contact-email")

Android statusbar icons color

@eOnOe has answered how we can change status bar tint through xml. But we can also change it dynamically in code:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    View decor = getWindow().getDecorView();
    if (shouldChangeStatusBarTintToDark) {
        decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
    } else {
        // We want to change tint color to white again.
        // You can also record the flags in advance so that you can turn UI back completely if
        // you have set other flags before, such as translucent or full screen.
        decor.setSystemUiVisibility(0);
    }
}

How to get the hostname of the docker host from inside a docker container on that host without env vars

I think the reason that I have the same issue is a bug in the latest Docker for Mac beta, but buried in the comments there I was able to find a solution that worked for me & my team. We're using this for local development, where we need our containerized services to talk to a monolith as we work to replace it. This is probably not a production-viable solution.

On the host machine, alias a known available IP address to the loopback interface:

$ sudo ifconfig lo0 alias 10.200.10.1/24

Then add that IP with a hostname to your docker config. In my case, I'm using docker-compose, so I added this to my docker-compose.yml:

extra_hosts:
# configure your host to alias 10.200.10.1 to the loopback interface:
#       sudo ifconfig lo0 alias 10.200.10.1/24
- "relevant_hostname:10.200.10.1"

I then verified that the desired host service (a web server) was available from inside the container by attaching to a bash session, and using wget to request a page from the host's web server:

$ docker exec -it container_name /bin/bash
$ wget relevant_hostname/index.html
$ cat index.html

Toolbar overlapping below status bar

None of the answers worked for me, but this is what finally worked after I set:

android:fitsSystemWindows="false"

In parent activity layout file it's not suggested at many places but it's work for me and saves my day

Remove first Item of the array (like popping from stack)

Just use arr.slice(startingIndex, endingIndex).

If you do not specify the endingIndex, it returns all the items starting from the index provided.

In your case arr=arr.slice(1).

Getting DOM node from React child element

I found an easy way using the new callback refs. You can just pass a callback as a prop to the child component. Like this:

class Container extends React.Component {
  constructor(props) {
    super(props)
    this.setRef = this.setRef.bind(this)
  }

  setRef(node) {
    this.childRef = node
  }

  render() {
    return <Child setRef={ this.setRef }/>
  }
}

const Child = ({ setRef }) => (
    <div ref={ setRef }>
    </div>
)

Here's an example of doing this with a modal:

class Container extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      modalOpen: false
    }
    this.open = this.open.bind(this)
    this.close = this.close.bind(this)
    this.setModal = this.setModal.bind(this)
  }

  open() {
    this.setState({ open: true })
  }

  close(event) {
    if (!this.modal.contains(event.target)) {
      this.setState({ open: false })
    }
  }

  setModal(node) {
    this.modal = node
  }

  render() {
    let { modalOpen } = this.state
    return (
      <div>
        <button onClick={ this.open }>Open</button>
        {
          modalOpen ? <Modal close={ this.close } setModal={ this.setModal }/> : null
        }
      </div>
    )
  }
}

const Modal = ({ close, setModal }) => (
  <div className='modal' onClick={ close }>
    <div className='modal-window' ref={ setModal }>
    </div>
  </div>
)

How can I encode a string to Base64 in Swift?

Swift 4.2

var base64String = "my fancy string".data(using: .utf8, allowLossyConversion: false)?.base64EncodedString()

to decode, see (from https://gist.github.com/stinger/a8a0381a57b4ac530dd029458273f31a)

//: # Swift 3: Base64 encoding and decoding
import Foundation

extension String {
//: ### Base64 encoding a string
    func base64Encoded() -> String? {
        if let data = self.data(using: .utf8) {
            return data.base64EncodedString()
        }
        return nil
    }

//: ### Base64 decoding a string
    func base64Decoded() -> String? {
        if let data = Data(base64Encoded: self) {
            return String(data: data, encoding: .utf8)
        }
        return nil
    }
}
var str = "Hello, playground"
print("Original string: \"\(str)\"")

if let base64Str = str.base64Encoded() {
    print("Base64 encoded string: \"\(base64Str)\"")
    if let trs = base64Str.base64Decoded() {
        print("Base64 decoded string: \"\(trs)\"")
        print("Check if base64 decoded string equals the original string: \(str == trs)")
    }
}

Convert Map to JSON using Jackson

If you're using jackson, better to convert directly to ObjectNode.

//not including SerializationFeatures for brevity
static final ObjectMapper mapper = new ObjectMapper();

//pass it your payload
public static ObjectNode convObjToONode(Object o) {
    StringWriter stringify = new StringWriter();
    ObjectNode objToONode = null;

    try {
        mapper.writeValue(stringify, o);
        objToONode = (ObjectNode) mapper.readTree(stringify.toString());
    } catch (IOException e) {
        e.printStackTrace();
    }

    System.out.println(objToONode);
    return objToONode;
}

Trying to use Spring Boot REST to Read JSON String from POST

To receive arbitrary Json in Spring-Boot, you can simply use Jackson's JsonNode. The appropriate converter is automatically configured.

    @PostMapping(value="/process")
    public void process(@RequestBody com.fasterxml.jackson.databind.JsonNode payload) {
        System.out.println(payload);
    }

How do I extract data from JSON with PHP?

Intro

First off you have a string. JSON is not an array, an object, or a data structure. JSON is a text-based serialization format - so a fancy string, but still just a string. Decode it in PHP by using json_decode().

 $data = json_decode($json);

Therein you might find:

scalars: strings, ints, floats, and bools
nulls (a special type of its own)
compound types: objects and arrays.

These are the things that can be encoded in JSON. Or more accurately, these are PHP's versions of the things that can be encoded in JSON.

There's nothing special about them. They are not "JSON objects" or "JSON arrays." You've decoded the JSON - you now have basic everyday PHP types.

Objects will be instances of stdClass, a built-in class which is just a generic thing that's not important here.

Accessing object properties

You access the properties of one of these objects the same way you would for the public non-static properties of any other object, e.g. $object->property.

$json = '
{
    "type": "donut",
    "name": "Cake"
}';

$yummy = json_decode($json);

echo $yummy->type; //donut

Accessing array elements

You access the elements of one of these arrays the same way you would for any other array, e.g. $array[0].

$json = '
[
    "Glazed",
    "Chocolate with Sprinkles",
    "Maple"
]';

$toppings = json_decode($json);

echo $toppings[1]; //Chocolate with Sprinkles

Iterate over it with foreach.

foreach ($toppings as $topping) {
    echo $topping, "\n";
}

Glazed
Chocolate with Sprinkles
Maple

Or mess about with any of the bazillion built-in array functions.

Accessing nested items

The properties of objects and the elements of arrays might be more objects and/or arrays - you can simply continue to access their properties and members as usual, e.g. $object->array[0]->etc.

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json);

echo $yummy->toppings[2]->id; //5004

Passing `true` as the second argument to json_decode()

When you do this, instead of objects you'll get associative arrays - arrays with strings for keys. Again you access the elements thereof as usual, e.g. $array['key'].

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json, true);

echo $yummy['toppings'][2]['type']; //Maple

Accessing associative array items

When decoding a JSON object to an associative PHP array, you can iterate both keys and values using the foreach (array_expression as $key => $value) syntax, eg

$json = '
{
    "foo": "foo value",
    "bar": "bar value",
    "baz": "baz value"
}';

$assoc = json_decode($json, true);
foreach ($assoc as $key => $value) {
    echo "The value of key '$key' is '$value'", PHP_EOL;
}

Prints

The value of key 'foo' is 'foo value'
The value of key 'bar' is 'bar value'
The value of key 'baz' is 'baz value'

Don't know how the data is structured

Read the documentation for whatever it is you're getting the JSON from.

Look at the JSON - where you see curly brackets {} expect an object, where you see square brackets [] expect an array.

Hit the decoded data with a print_r():

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json);

print_r($yummy);

and check the output:

stdClass Object
(
    [type] => donut
    [name] => Cake
    [toppings] => Array
        (
            [0] => stdClass Object
                (
                    [id] => 5002
                    [type] => Glazed
                )

            [1] => stdClass Object
                (
                    [id] => 5006
                    [type] => Chocolate with Sprinkles
                )

            [2] => stdClass Object
                (
                    [id] => 5004
                    [type] => Maple
                )

        )

)

It'll tell you where you have objects, where you have arrays, along with the names and values of their members.

If you can only get so far into it before you get lost - go that far and hit that with print_r():

print_r($yummy->toppings[0]);

stdClass Object
(
    [id] => 5002
    [type] => Glazed
)

Take a look at it in this handy interactive JSON explorer.

Break the problem down into pieces that are easier to wrap your head around.

`json_decode()` returns `null`

This happens because either:

The JSON consists entirely of just that, null.
The JSON is invalid - check the result of json_last_error_msg or put it through something like JSONLint.
It contains elements nested more than 512 levels deep. This default max depth can be overridden by passing an integer as the third argument to json_decode().

If you need to change the max depth you're probably solving the wrong problem. Find out why you're getting such deeply nested data (e.g. the service you're querying that's generating the JSON has a bug) and get that to not happen.

Object property name contains a special character

Sometimes you'll have an object property name that contains something like a hyphen - or at sign @ which can't be used in a literal identifier. Instead you can use a string literal within curly braces to address it.

$json = '{"@attributes":{"answer":42}}';
$thing = json_decode($json);

echo $thing->{'@attributes'}->answer; //42

If you have an integer as property see: How to access object properties with names like integers? as reference.

Someone put JSON in your JSON

It's ridiculous but it happens - there's JSON encoded as a string within your JSON. Decode, access the string as usual, decode that, and eventually get to what you need.

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": "[{ \"type\": \"Glazed\" }, { \"type\": \"Maple\" }]"
}';

$yummy = json_decode($json);
$toppings = json_decode($yummy->toppings);

echo $toppings[0]->type; //Glazed

Data doesn't fit in memory

If your JSON is too large for json_decode() to handle at once things start to get tricky. See:

How to sort it

See: Reference: all basic ways to sort arrays and data in PHP.

Set min-width either by content or 200px (whichever is greater) together with max-width

The problem is that flex: 1 sets flex-basis: 0. Instead, you need

.container .box {
  min-width: 200px;
  max-width: 400px;
  flex-basis: auto; /* default value */
  flex-grow: 1;
}

_x000D_

.container {_x000D_
  display: -webkit-flex;_x000D_
  display: flex;_x000D_
  -webkit-flex-wrap: wrap;_x000D_
  flex-wrap: wrap;_x000D_
}_x000D_
_x000D_
.container .box {_x000D_
  -webkit-flex-grow: 1;_x000D_
  flex-grow: 1;_x000D_
  min-width: 100px;_x000D_
  max-width: 400px;_x000D_
  height: 200px;_x000D_
  background-color: #fafa00;_x000D_
  overflow: hidden;_x000D_
}

_x000D_

<div class="container">_x000D_
  <div class="box">_x000D_
    <table>_x000D_
      <tr>_x000D_
        <td>Content</td>_x000D_
        <td>Content</td>_x000D_
        <td>Content</td>_x000D_
      </tr>_x000D_
    </table>    _x000D_
  </div>_x000D_
  <div class="box">_x000D_
    <table>_x000D_
      <tr>_x000D_
        <td>Content</td>_x000D_
      </tr>_x000D_
    </table>    _x000D_
  </div>_x000D_
  <div class="box">_x000D_
    <table>_x000D_
      <tr>_x000D_
        <td>Content</td>_x000D_
        <td>Content</td>_x000D_
      </tr>_x000D_
    </table>    _x000D_
  </div>_x000D_
</div>

_x000D_

command/usr/bin/codesign failed with exit code 1- code sign error

Open the project into the Xcode.
Select project.app file and right click on it, select “show in finder” option.
Open terminal and go to the project.app file path.

Type the following to commands one by one:

xattr -lr project.app
xattr -cr project.app

Open the project and run.

Required request body content is missing: org.springframework.web.method.HandlerMethod$HandlerMethodParameter

I made some minor modification to you code and tested it with a spring project that I have and it works, The logic will only work with POST if I use GET it throws an error with invalid request. Also in your ajax call I commented out commit(true), the browser debugger flagged and error that it is not defined. Just modify the url to fit your Spring project architecture.

 $.ajax({ 
                    url: "/addDepartment", 
                    method: 'POST', 
                    dataType: 'json', 
                    data: "{\"message\":\"abc\",\"success\":true}",
                    contentType: 'application/json',
                    mimeType: 'application/json',
                    success: function(data) { 
                        alert(data.success + " " + data.message);
                        //commit(true);
                    },
                    error:function(data,status,er) { 
                        alert("error: "+data+" status: "+status+" er:"+er);
                    }
                });



@RequestMapping(value="/addDepartment", method=RequestMethod.POST)
  public AjaxResponse addDepartment(@RequestBody final AjaxResponse  departmentDTO)
  {
    System.out.println("addDepartment: >>>>>>> "+departmentDTO);
    AjaxResponse response=new AjaxResponse();
    response.setSuccess(departmentDTO.isSuccess());
    response.setMessage(departmentDTO.getMessage());
    return response;
  }

Can't Autowire @Repository annotated interface in Spring Boot

I had a similar issue where I was receiving NoSuchBeanDefinitionException in Spring Boot (basically while working on CRUD repository), I had to put the below annotations on the main class:

@SpringBootApplication   
@EnableAutoConfiguration
@ComponentScan(basePackages={"<base package name>"})
@EnableJpaRepositories(basePackages="<repository package name>")
@EnableTransactionManagement
@EntityScan(basePackages="<entity package name>")

Also, make sure you have the @Component annotations in place on the implementations.

recyclerview No adapter attached; skipping layout

I had the same error I fixed it doing this if you are waiting for data like me using retrofit or something like that

Put before Oncreate

private ArtistArrayAdapter adapter;
private RecyclerView recyclerView;

Put them in your Oncreate

 recyclerView = (RecyclerView) findViewById(R.id.cardList);
 recyclerView.setHasFixedSize(true);
 recyclerView.setLayoutManager(new LinearLayoutManager(this));
 adapter = new ArtistArrayAdapter( artists , R.layout.list_item ,getApplicationContext());
 recyclerView.setAdapter(adapter);

When you receive data put

adapter = new ArtistArrayAdapter( artists , R.layout.list_item ,getApplicationContext());
recyclerView.setAdapter(adapter);

Now go in your ArtistArrayAdapter class and do this what it will do is if your array is empty or is null it will make GetItemCount return 0 if not it will make it the size of artists array

@Override
public int getItemCount() {

    int a ;

    if(artists != null && !artists.isEmpty()) {

        a = artists.size();
    }
    else {

        a = 0;

     }

   return a;
}

Convert a object into JSON in REST service by Spring MVC

Spring framework itself handles json conversion when controller is annotated properly.

For eg:

   @PutMapping(produces = {"application/json"})
        @ResponseBody
        public UpdateResponse someMethod(){ //do something
return UpdateResponseInstance;
}

Here spring internally converts the UpdateResponse object to corresponding json string and returns it. In order to do it spring internally uses Jackson library.

If you require a json representation of a model object anywhere apart from controller then you can use objectMapper provided by jackson. Model should be properly annotated for this to work.

Eg:

ObjectMapper mapper = new ObjectMapper();
SomeModelClass someModelObject = someModelRepository.findById(idValue).get();
mapper.writeValueAsString(someModelObject);

How to write a unit test for a Spring Boot Controller endpoint

Here is another answer using Spring MVC's standaloneSetup. Using this way you can either autowire the controller class or Mock it.

    import static org.mockito.Mockito.mock;
    import static org.springframework.test.web.server.request.MockMvcRequestBuilders.get;
    import static org.springframework.test.web.server.result.MockMvcResultMatchers.content;
    import static org.springframework.test.web.server.result.MockMvcResultMatchers.status;

    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.http.MediaType;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    import org.springframework.test.web.server.MockMvc;
    import org.springframework.test.web.server.setup.MockMvcBuilders;


    @RunWith(SpringJUnit4ClassRunner.class)
    @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
    public class DemoApplicationTests {

        final String BASE_URL = "http://localhost:8080/";

        @Autowired
        private HelloWorld controllerToTest;

        private MockMvc mockMvc;

        @Before
        public void setup() {
            this.mockMvc = MockMvcBuilders.standaloneSetup(controllerToTest).build();
        }

        @Test
        public void testSayHelloWorld() throws Exception{
            //Mocking Controller
            controllerToTest = mock(HelloWorld.class);

             this.mockMvc.perform(get("/")
                     .accept(MediaType.parseMediaType("application/json;charset=UTF-8")))
                     .andExpect(status().isOk())
                     .andExpect(content().mimeType(MediaType.APPLICATION_JSON));
        }

        @Test
        public void contextLoads() {
        }

    }

Spring Boot REST service exception handling

New answer (2016-04-20)

Using Spring Boot 1.3.1.RELEASE

New Step 1 - It is easy and less intrusive to add the following properties to the application.properties:

spring.mvc.throw-exception-if-no-handler-found=true
spring.resources.add-mappings=false

Much easier than modifying the existing DispatcherServlet instance (as below)! - JO'

If working with a full RESTful Application, it is very important to disable the automatic mapping of static resources since if you are using Spring Boot's default configuration for handling static resources then the resource handler will be handling the request (it's ordered last and mapped to /** which means that it picks up any requests that haven't been handled by any other handler in the application) so the dispatcher servlet doesn't get a chance to throw an exception.

New Answer (2015-12-04)

Using Spring Boot 1.2.7.RELEASE

New Step 1 - I found a much less intrusive way of setting the "throExceptionIfNoHandlerFound" flag. Replace the DispatcherServlet replacement code below (Step 1) with this in your application initialization class:

@ComponentScan()
@EnableAutoConfiguration
public class MyApplication extends SpringBootServletInitializer {
    private static Logger LOG = LoggerFactory.getLogger(MyApplication.class);
    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(MyApplication.class, args);
        DispatcherServlet dispatcherServlet = (DispatcherServlet)ctx.getBean("dispatcherServlet");
        dispatcherServlet.setThrowExceptionIfNoHandlerFound(true);
    }

In this case, we're setting the flag on the existing DispatcherServlet, which preserves any auto-configuration by the Spring Boot framework.

One more thing I've found - the @EnableWebMvc annotation is deadly to Spring Boot. Yes, that annotation enables things like being able to catch all the controller exceptions as described below, but it also kills a LOT of the helpful auto-configuration that Spring Boot would normally provide. Use that annotation with extreme caution when you use Spring Boot.

Original Answer:

After a lot more research and following up on the solutions posted here (thanks for the help!) and no small amount of runtime tracing into the Spring code, I finally found a configuration that will handle all Exceptions (not Errors, but read on) including 404s.

Step 1 - tell SpringBoot to stop using MVC for "handler not found" situations. We want Spring to throw an exception instead of returning to the client a view redirect to "/error". To do this, you need to have an entry in one of your configuration classes:

// NEW CODE ABOVE REPLACES THIS! (2015-12-04)
@Configuration
public class MyAppConfig {
    @Bean  // Magic entry 
    public DispatcherServlet dispatcherServlet() {
        DispatcherServlet ds = new DispatcherServlet();
        ds.setThrowExceptionIfNoHandlerFound(true);
        return ds;
    }
}

The downside of this is that it replaces the default dispatcher servlet. This hasn't been a problem for us yet, with no side effects or execution problems showing up. If you're going to do anything else with the dispatcher servlet for other reasons, this is the place to do them.

Step 2 - Now that spring boot will throw an exception when no handler is found, that exception can be handled with any others in a unified exception handler:

@EnableWebMvc
@ControllerAdvice
public class ServiceExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler(Throwable.class)
    @ResponseBody
    ResponseEntity<Object> handleControllerException(HttpServletRequest req, Throwable ex) {
        ErrorResponse errorResponse = new ErrorResponse(ex);
        if(ex instanceof ServiceException) {
            errorResponse.setDetails(((ServiceException)ex).getDetails());
        }
        if(ex instanceof ServiceHttpException) {
            return new ResponseEntity<Object>(errorResponse,((ServiceHttpException)ex).getStatus());
        } else {
            return new ResponseEntity<Object>(errorResponse,HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

    @Override
    protected ResponseEntity<Object> handleNoHandlerFoundException(NoHandlerFoundException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
        Map<String,String> responseBody = new HashMap<>();
        responseBody.put("path",request.getContextPath());
        responseBody.put("message","The URL you have reached is not in service at this time (404).");
        return new ResponseEntity<Object>(responseBody,HttpStatus.NOT_FOUND);
    }
    ...
}

Keep in mind that I think the "@EnableWebMvc" annotation is significant here. It seems that none of this works without it. And that's it - your Spring boot app will now catch all exceptions, including 404s, in the above handler class and you may do with them as you please.

One last point - there doesn't seem to be a way to get this to catch thrown Errors. I have a wacky idea of using aspects to catch errors and turn them into Exceptions that the above code can then deal with, but I have not yet had time to actually try implementing that. Hope this helps someone.

Any comments/corrections/enhancements will be appreciated.

enum to string in modern C++11 / C++14 / C++17 and future C++20

My answer is here.

You can get enum value names and these indices simultaneously as deque of string.

This method only needs little copy and paste and edit.

Obtained result needs type-casting from size_t to enum class type when you need enum class type value, but I think it is a very portable and powerful way to treat enum class.

enum class myenum
{
  one = 0,
  two,
  three,
};

deque<string> ssplit(const string &_src, boost::regex &_re)
{
  boost::sregex_token_iterator it(_src.begin(), _src.end(), _re, -1);
  boost::sregex_token_iterator e;
  deque<string> tokens;
  while (it != e)
    tokens.push_back(*it++);
  return std::move(tokens);
}

int main()
{
  regex re(",");
  deque<string> tokens = ssplit("one,two,three", re);
  for (auto &t : tokens) cout << t << endl;
    getchar();
  return 0;
}

Hadoop cluster setup - java.net.ConnectException: Connection refused

In /etc/hosts:

Add this line:

your-ip-address your-host-name

example: 192.168.1.8 master

In /etc/hosts:

Delete the line with 127.0.1.1 (This will cause loopback)
In your core-site, change localhost to your-ip or your-hostname

Now, restart the cluster.

How does the Spring @ResponseBody annotation work?

The first basic thing to understand is the difference in architectures.

One end you have the MVC architecture, which is based on your normal web app, using web pages, and the browser makes a request for a page:

Browser <---> Controller <---> Model
               |      |
               +-View-+

The browser makes a request, the controller (@Controller) gets the model (@Entity), and creates the view (JSP) from the model and the view is returned back to the client. This is the basic web app architecture.

On the other end, you have a RESTful architecture. In this case, there is no View. The Controller only sends back the model (or resource representation, in more RESTful terms). The client can be a JavaScript application, a Java server application, any application in which we expose our REST API to. With this architecture, the client decides what to do with this model. Take for instance Twitter. Twitter as the Web (REST) API, that allows our applications to use its API to get such things as status updates, so that we can use it to put that data in our application. That data will come in some format like JSON.

That being said, when working with Spring MVC, it was first built to handle the basic web application architecture. There are may different method signature flavors that allow a view to be produced from our methods. The method could return a ModelAndView where we explicitly create it, or there are implicit ways where we can return some arbitrary object that gets set into model attributes. But either way, somewhere along the request-response cycle, there will be a view produced.

But when we use @ResponseBody, we are saying that we do not want a view produced. We just want to send the return object as the body, in whatever format we specify. We wouldn't want it to be a serialized Java object (though possible). So yes, it needs to be converted to some other common type (this type is normally dealt with through content negotiation - see link below). Honestly, I don't work much with Spring, though I dabble with it here and there. Normally, I use

@RequestMapping(..., produces = MediaType.APPLICATION_JSON_VALUE)

to set the content type, but maybe JSON is the default. Don't quote me, but if you are getting JSON, and you haven't specified the produces, then maybe it is the default. JSON is not the only format. For instance, the above could easily be sent in XML, but you would need to have the produces to MediaType.APPLICATION_XML_VALUE and I believe you need to configure the HttpMessageConverter for JAXB. As for the JSON MappingJacksonHttpMessageConverter configured, when we have Jackson on the classpath.

I would take some time to learn about Content Negotiation. It's a very important part of REST. It'll help you learn about the different response formats and how to map them to your methods.

JsonParseException: Unrecognized token 'http': was expecting ('true', 'false' or 'null')

Add produces = "application/json" in @RequestMapping

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference

in your baseadapter class constructor try to initialize LayoutInflater, normally i preferred this way,

public ClassBaseAdapter(Context context,ArrayList<Integer> listLoanAmount) {
    this.context = context;
    this.listLoanAmount = listLoanAmount;
    this.layoutInflater = LayoutInflater.from(context);
}

at the top of the class create LayoutInflater variable, hope this will help you

Get cart item name, quantity all details woocommerce

Note on product price

The price of the product in the cart may be different from that of the product.

This can happen when you use some plugins that change the price of the product when it is added to the cart or if you have added a custom function in the functions.php of your active theme.

If you want to be sure you get the price of the product added to the cart you will have to get it like this:

foreach ( WC()->cart->get_cart() as $cart_item ) {
    // gets the cart item quantity
    $quantity           = $cart_item['quantity'];
    // gets the cart item subtotal
    $line_subtotal      = $cart_item['line_subtotal']; 
    $line_subtotal_tax  = $cart_item['line_subtotal_tax'];
    // gets the cart item total
    $line_total         = $cart_item['line_total'];
    $line_tax           = $cart_item['line_tax'];
    // unit price of the product
    $item_price         = $line_subtotal / $quantity;
    $item_tax           = $line_subtotal_tax / $quantity;

}

Instead of:

foreach ( WC()->cart->get_cart() as $cart_item ) {
    // gets the product object
    $product            = $cart_item['data'];
    // gets the product prices
    $regular_price      = $product->get_regular_price();
    $sale_price         = $product->get_sale_price();
    $price              = $product->get_price();
}

Other data you can get:

foreach ( WC()->cart->get_cart() as $cart_item ) {

    // get the data of the cart item
    $product_id         = $cart_item['product_id'];
    $variation_id       = $cart_item['variation_id'];

    // gets the cart item quantity
    $quantity           = $cart_item['quantity'];
    // gets the cart item subtotal
    $line_subtotal      = $cart_item['line_subtotal']; 
    $line_subtotal_tax  = $cart_item['line_subtotal_tax'];
    // gets the cart item total
    $line_total         = $cart_item['line_total'];
    $line_tax           = $cart_item['line_tax'];
    // unit price of the product
    $item_price         = $line_subtotal / $quantity;
    $item_tax           = $line_subtotal_tax / $quantity;

    // gets the product object
    $product            = $cart_item['data'];
    // get the data of the product
    $sku                = $product->get_sku();
    $name               = $product->get_name();
    $regular_price      = $product->get_regular_price();
    $sale_price         = $product->get_sale_price();
    $price              = $product->get_price();
    $stock_qty          = $product->get_stock_quantity();
    // attributes
    $attributes         = $product->get_attributes();
    $attribute          = $product->get_attribute( 'pa_attribute-name' ); // // specific attribute eg. "pa_color"
    // custom meta
    $custom_meta        = $product->get_meta( '_custom_meta_key', true );
    // product categories
    $categories         = wc_get_product_category_list(  $product->get_id() ); // returns a string with all product categories separated by a comma
}

@Autowired - No qualifying bean of type found for dependency at least 1 bean

In your controller class, just add @ComponentScan("package") annotation. In my case the package name is com.shoppingcart.So i wrote the code as @ComponentScan("com.shoppingcart") and it worked for me.

How to Correctly Check if a Process is running and Stop it

@jmp242 - the generic System.Object type does not contain the CloseMainWindow method, but statically casting the System.Diagnostics.Process type when collecting the ProcessList variable works for me. Updated code (from this answer) with this casting (and looping changed to use ForEach-Object) is below.

function Stop-Processes {
    param(
        [parameter(Mandatory=$true)] $processName,
                                     $timeout = 5
    )
    [System.Diagnostics.Process[]]$processList = Get-Process $processName -ErrorAction SilentlyContinue

    ForEach ($Process in $processList) {
        # Try gracefully first
        $Process.CloseMainWindow() | Out-Null
    }

    # Check the 'HasExited' property for each process
    for ($i = 0 ; $i -le $timeout; $i++) {
        $AllHaveExited = $True
        $processList | ForEach-Object {
            If (-NOT $_.HasExited) {
                $AllHaveExited = $False
            }                    
        }
        If ($AllHaveExited -eq $true){
            Return
        }
        Start-Sleep 1
    }
    # If graceful close has failed, loop through 'Stop-Process'
    $processList | ForEach-Object {
        If (Get-Process -ID $_.ID -ErrorAction SilentlyContinue) {
            Stop-Process -Id $_.ID -Force -Verbose
        }
    }
}

"Could not find acceptable representation" using spring-boot-starter-web

If using @FeignClient, add e.g.

produces = "application/json"

to the @RequestMapping annotation

Open web in new tab Selenium + Python

browser.execute_script('''window.open("http://bings.com","_blank");''')

Where browser is the webDriver

Bootstrap - How to add a logo to navbar class?

I found a solution on another thread that works - use the pull-left class:

 <a href="#" class="pull-left"><img src="/path/to/image.png"></a>

Thanks to Michael in this thread:

Bootstrap - How to add a logo to navbar class?

Group by multiple field names in java 8

Hi You can simply concatenate your groupingByKey such as

Map<String, List<Person>> peopleBySomeKey = people
                .collect(Collectors.groupingBy(p -> getGroupingByKey(p), Collectors.mapping((Person p) -> p, toList())));



//write getGroupingByKey() function
private String getGroupingByKey(Person p){
return p.getAge()+"-"+p.getName();
}

How to extend available properties of User.Identity

For anyone that finds this question looking for how to access custom properties in ASP.NET Core 2.1 - it's much easier: You'll have a UserManager, e.g. in _LoginPartial.cshtml, and then you can simply do (assuming "ScreenName" is a property that you have added to your own AppUser which inherits from IdentityUser):

@using Microsoft.AspNetCore.Identity

@using <namespaceWhereYouHaveYourAppUser>

@inject SignInManager<AppUser> SignInManager
@inject UserManager<AppUser> UserManager

@if (SignInManager.IsSignedIn(User)) {
    <form asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="@Url.Action("Index", "Home", new { area = "" })" 
          method="post" id="logoutForm" 
          class="form-inline my-2 my-lg-0">

        <ul class="nav navbar-nav ml-auto">
            <li class="nav-item">
                <a class="nav-link" asp-area="Identity" asp-page="/Account/Manage/Index" title="Manage">
                    Hello @((await UserManager.GetUserAsync(User)).ScreenName)!
                    <!-- Original code, shows Email-Address: @UserManager.GetUserName(User)! -->
                </a>
            </li>
            <li class="nav-item">
                <button type="submit" class="btn btn-link nav-item navbar-link nav-link">Logout</button>
            </li>
        </ul>

    </form>
} else {
    <ul class="navbar-nav ml-auto">
        <li class="nav-item"><a class="nav-link" asp-area="Identity" asp-page="/Account/Register">Register</a></li>
        <li class="nav-item"><a class="nav-link" asp-area="Identity" asp-page="/Account/Login">Login</a></li>
    </ul>
}

How to customise the Jackson JSON mapper implicitly used by Spring Boot?

You can add a following method inside your bootstrap class which is annotated with @SpringBootApplication

    @Bean
    @Primary
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
    ObjectMapper objectMapper = builder.createXmlMapper(false).build();
    objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    objectMapper.configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false);

    objectMapper.registerModule(new JodaModule());

    return objectMapper;
}

Getting a "This application is modifying the autolayout engine from a background thread" error?

I had this issue when I was using TouchID if that helps anyone else, wrap your success logic which likely does something with the UI in the main queue.

Default SecurityProtocol in .NET 4.5

Microsoft recently published best practices around this. https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls

Summary

Target .Net Framework 4.7, remove any code setting the SecurityProtocol, thus the OS will ensure you use the most secure solution.

NB: You will also need to ensure that the latest version of TLS is supported & enabled on your OS.

OS                          TLS 1.2 support

Windows 10                  \_ Supported, and enabled by default.
Windows Server 2016         /   
Windows 8.1                 \_ Supported, and enabled by default.
Windows Server 2012 R2      /
Windows 8.0                 \_ Supported, and enabled by default.
Windows Server 2012         /
Windows 7 SP1               \_ Supported, but not enabled by default*.
Windows Server 2008 R2 SP1  /
Windows Server 2008         -  Support for TLS 1.2 and TLS 1.1 requires an update. See Update to add support for TLS 1.1 and TLS 1.2 in Windows Server 2008 SP2.
Windows Vista               -  Not supported.

* To enable TLS1.2 via the registry see https://docs.microsoft.com/en-us/windows-server/security/tls/tls-registry-settings#tls-12 

    Path: HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS1.2\Server

        Property: Enabled
        Type: REG_DWORD
        Value: 1

        Property: DisabledByDefault 
        Type: REG_DWORD
        Value: 0

    Path: HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS1.2\Client

        Property: Enabled
        Type: REG_DWORD
        Value: 1

        Property: DisabledByDefault 
        Type: REG_DWORD
        Value: 0

For more information and older frameworks, please refer to the MS link.

iOS how to set app icon and launch images

The correct sizes are as following:

1)58x58

2)80x80

3)120x120

4)180x180

A child container failed during start java.util.concurrent.ExecutionException

You must have packaged the servlet-api.jar along with the other libraries in your war file. You can verify this by opening up your war file and navigating to the WEB-INF/lib folder.

Ideally, you should not provide the servlet-api jar. The container, in your case Tomcat, is responsible for providing it at deploy time to your application. If you try to provide it as well, then issues arise due to version mismatch etc. Best practise is to just avoid packaging it. Remove it from the WEB-INF/lib.

Additional Information

If you are using maven for your packaging, then simply add the provided tag with the dependency and maven will make sure not to package it in the final war file. Something like

<dependency>
    <artifact>..
    <group> ...
    <version> ...
    <scope>provided</scope>
</<dependency>

Spring Boot - Error creating bean with name 'dataSource' defined in class path resource

change below line of code

spring.datasource.driverClassName

spring.datasource.driver-class-name

What is difference between @RequestBody and @RequestParam?

@RequestParam annotated parameters get linked to specific Servlet request parameters. Parameter values are converted to the declared method argument type. This annotation indicates that a method parameter should be bound to a web request parameter.

For example Angular request for Spring RequestParam(s) would look like that:

$http.post('http://localhost:7777/scan/l/register?username="Johny"&password="123123"&auth=true')
      .success(function (data, status, headers, config) {
                        ...
                    })

Endpoint with RequestParam:

@RequestMapping(method = RequestMethod.POST, value = "/register")
public Map<String, String> register(Model uiModel,
                                    @RequestParam String username,
                                    @RequestParam String password,
                                    @RequestParam boolean auth,
                                    HttpServletRequest httpServletRequest) {...

@RequestBody annotated parameters get linked to the HTTP request body. Parameter values are converted to the declared method argument type using HttpMessageConverters. This annotation indicates a method parameter should be bound to the body of the web request.

For example Angular request for Spring RequestBody would look like that:

$scope.user = {
            username: "foo",
            auth: true,
            password: "bar"
        };    
$http.post('http://localhost:7777/scan/l/register', $scope.user).
                        success(function (data, status, headers, config) {
                            ...
                        })

Endpoint with RequestBody:

@RequestMapping(method = RequestMethod.POST, produces = "application/json", 
                value = "/register")
public Map<String, String> register(Model uiModel,
                                    @RequestBody User user,
                                    HttpServletRequest httpServletRequest) {...

Hope this helps.

How to use Spring Boot with MySQL database and JPA?

You can move Application.java to a folder under the java.

dropping rows from dataframe based on a "not in" condition

You can use pandas.Dataframe.isin.

pandas.Dateframe.isin will return boolean values depending on whether each element is inside the list a or not. You then invert this with the ~ to convert True to False and vice versa.

import pandas as pd

a = ['2015-01-01' , '2015-02-01']

df = pd.DataFrame(data={'date':['2015-01-01' , '2015-02-01', '2015-03-01' , '2015-04-01', '2015-05-01' , '2015-06-01']})

print(df)
#         date
#0  2015-01-01
#1  2015-02-01
#2  2015-03-01
#3  2015-04-01
#4  2015-05-01
#5  2015-06-01

df = df[~df['date'].isin(a)]

print(df)
#         date
#2  2015-03-01
#3  2015-04-01
#4  2015-05-01
#5  2015-06-01

serialize/deserialize java 8 java.time with Jackson JSON mapper

I use this time format: "{birthDate": "2018-05-24T13:56:13Z}" to deserialize from json into java.time.Instant (see screenshot)

How to configure Docker port mapping to use Nginx as an upstream proxy?

Just found an article from Anand Mani Sankar wich shows a simple way of using nginx upstream proxy with docker composer.

Basically one must configure the instance linking and ports at the docker-compose file and update upstream at nginx.conf accordingly.

Can not deserialize instance of java.lang.String out of START_ARRAY token

The error is:

Can not deserialize instance of java.lang.String out of START_ARRAY token at [Source: line: 1, column: 1095] (through reference chain: JsonGen["platforms"])

In JSON, platforms look like this:

"platforms": [
    {
        "platform": "iphone"
    },
    {
        "platform": "ipad"
    },
    {
        "platform": "android_phone"
    },
    {
        "platform": "android_tablet"
    }
]

So try change your pojo to something like this:

private List platforms;

public List getPlatforms(){
    return this.platforms;
}

public void setPlatforms(List platforms){
    this.platforms = platforms;
}

EDIT: you will need change mobile_networks too. Will look like this:

private List mobile_networks;

public List getMobile_networks() {
    return mobile_networks;
}

public void setMobile_networks(List mobile_networks) {
    this.mobile_networks = mobile_networks;
}

- java.lang.NullPointerException - setText on null object reference

The problem is the tv.setText(text). The variable tv is probably null and you call the setText method on that null, which you can't. My guess that the problem is on the findViewById method, but it's not here, so I can't tell more, without the code.

Spring Boot War deployed to Tomcat

Hey make sure to do this changes to the pom.xml

<packaging>war</packaging>

in the dependencies section make sure to indicated the tomcat is provided so you dont need the embeded tomcat plugin.

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>       

    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <scope>provided</scope>
    </dependency>

This is the whole pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <start-class>com.example.Application</start-class>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>       

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>       

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

And the Application class should be like this

Application.java

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class Application extends SpringBootServletInitializer {


    /**
     * Used when run as JAR
     */
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    /**
     * Used when run as WAR
     */
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(Application.class);
    }

}

And you can add a controller for testing MyController.java

package com.example;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MyController {

    @RequestMapping("/hi")
    public @ResponseBody String hiThere(){
        return "hello world!";
    }
}

Then you can run the project in a tomcat 8 version and access the controller like this

http://localhost:8080/demo/hi

If for some reason you are not able to add the project to tomcat do a right click in the project and then go to the Build Path->configure build path->Project Faces

make sure only this 3 are selected

Dynamic web Module 3.1 Java 1.8 Javascript 1.0

How to send 100,000 emails weekly?

People have recommended MailChimp which is a good vendor for bulk email. If you're looking for a good vendor for transactional email, I might be able to help.

Over the past 6 months, we used four different SMTP vendors with the goal of figuring out which was the best one.

Here's a summary of what we found...

AuthSMTP

Cheapest around
No analysis/reporting
No tracking for opens/clicks
Had slight hesitation on some sends

Postmark

Very cheap, but not as cheap as AuthSMTP
Beautiful cpanel but no tracking on opens/clicks
Send-level activity tracking so you can open a single email that was sent and look at how it looked and the delivery data.
Have to use API. Sending by SMTP was recently introduced but it's buggy. For instance, we noticed that quotes (") in the subject line are stripped.
Cannot send any attachment you want. Must be on approved list of file types and under a certain size. (10 MB I think)
Requires a set list of from names/addresses.

JangoSMTP

Expensive in relation to the others – more than 10 times in some cases
Ugly cpanel but great tracking on opens/clicks with email-level detail
Had hesitation, at times, when sending. On two occasions, sends took an hour to be delivered
Requires a set list of from name/addresses.

SendGrid

Not quite a cheap as AuthSMTP but still very cheap. Many customers can exist on 200 free sends per day.
Decent cpanel but no in-depth detail on open/click tracking
Lots of API options. Options (open/click tracking, etc) can be custom defined on an email-by-email basis. Inbound (reply) email can be posted to our HTTP end point.
Absolutely zero hesitation on sends. Every email sent landed in the inbox almost immediately.
Can send from any from name/address.

Conclusion

SendGrid was the best with Postmark coming in second place. We never saw any hesitation in send times with either of those two - in some cases we sent several hundred emails at once - and they both have the best ROI, given a solid featureset.

Oracle Partition - Error ORA14400 - inserted partition key does not map to any partition

For this issue need to add the partition for date column values, If last partition 20201231245959, then inserting the 20210110245959 values, this issue will occurs.

For that need to add the 2021 partition into that table

ALTER TABLE TABLE_NAME ADD PARTITION PARTITION_NAME VALUES LESS THAN (TO_DATE('2021-12-31 24:59:59', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')) NOCOMPRESS

How do I parse JSON with Ruby on Rails?

Here is an update for 2013.

Ruby

Ruby 1.9 has a default JSON gem with C extensions. You can use it with

require 'json'
JSON.parse ''{ "x": "y" }'
# => {"x"=>"y"}

The parse! variant can be used for safe sources. There are also other gems, which may be faster than the default implementation. Please refer to multi_json for the list.

Rails

Modern versions of Rails use multi_json, a gem that automatically uses the fastest JSON gem available. Thus, the recommended way is to use

object = ActiveSupport::JSON.decode json_string

Please refer to ActiveSupport::JSON for more information. In particular, the important line in the method source is

data = MultiJson.load(json, options)

Then in your Gemfile, include the gems you want to use. For example,

group :production do
  gem 'oj'
end

Instagram: Share photo from webpage

Updated June 2020

It is no longer possible... allegedly. If you have a Facebook or Instagram dedicated contact (because you work in either a big agency or with a big client) it may potentially be possible depending on your use case, but it's highly discouraged.

Before December 2019:

It is now "possible":

https://developers.facebook.com/docs/instagram-api/content-publishing

The Content Publishing API is a subset of Instagram Graph API endpoints that allow you to publish media objects. Publishing media objects with this API is a two step process — you first create a media object container, then publish the container on your Business Account.

Its worth noting that "The Content Publishing API is in closed beta with Facebook Marketing Partners and Instagram Partners only. We are not accepting new applicants at this time." from https://stackoverflow.com/a/49677468/445887

Add/remove HTML inside div using JavaScript

Another solution is to use getDocumentById and insertAdjacentHTML.

Code:

function addRow() {

 const  div = document.getElementById('content');

 div.insertAdjacentHTML('afterbegin', 'PUT_HTML_HERE');

}

Check here, for more details: Element.insertAdjacentHTML()

#define macro for debug printing in C?

According to http://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html, there should be a ## before __VA_ARGS__.

Otherwise, a macro #define dbg_print(format, ...) printf(format, __VA_ARGS__) will not compile the following example: dbg_print("hello world");.

Make REST API call in Swift

func getAPICalling(mainUrl:String) {
    //create URL
    guard let url = URL(string: mainUrl) else {
      print("Error: cannot create URL")
      return
    }
    //create request
    let urlRequest = URLRequest(url: url)
    
    // create the session
    let config = URLSessionConfiguration.default
    let session = URLSession(configuration: config)
    
    // make the request
    let task = session.dataTask(with: urlRequest) {
      (data, response, error) in
        
      // check for any errors
      guard error == nil else {
        print("error calling GET")
        print(error!.localizedDescription)
        return
      }
        
      // make sure we got data
      guard let responseData = data else {
        print("error: did not receive data")
        return
      }
        
      // convert Data in JSON && parse the result as JSON, since that's what the API provides
      do {
        guard let object = try JSONSerialization.jsonObject(with: responseData, options: [])
          as? [String: Any] else {
            print("error trying to convert data to JSON")
            return
        }
        //JSON Response
        guard let todoTitle = object["response"] as? NSDictionary else {
          print("Could not get todo title from JSON")
          return
        }
        
        //Get array in response
        let responseList = todoTitle.value(forKey: "radioList") as! NSArray
        
        for item in responseList {
            let dic = item as! NSDictionary
            let str = dic.value(forKey: "radio_des") as! String
            self.arrName.append(str)
            print(item)
        }
        
        DispatchQueue.main.async {
            self.tblView.reloadData()
        }
        
      } catch  {
        print("error trying to convert data to JSON")
        return
      }
    }
    task.resume()
}

Usage:

getAPICalling(mainUrl:"https://dousic.com/api/radiolist?user_id=16")

Using G++ to compile multiple .cpp and .h files

~/In_ProjectDirectory $ g++ coordin_main.cpp coordin_func.cpp coordin.h

~/In_ProjectDirectory $ ./a.out

... Worked!!

Using Linux Mint with Geany IDE

When I saved each file to the same directory, one file was not saved correctly within the directory; the coordin.h file. So, rechecked and it was saved there as coordin.h, and not incorrectly as -> coordin.h.gch. The little stuff. Arg!!

What is the difference between "JPG" / "JPEG" / "PNG" / "BMP" / "GIF" / "TIFF" Image?

Since others have covered the differences, I'll hit the uses.

TIFF is usually used by scanners. It makes huge files and is not really used in applications.

BMP is uncompressed and also makes huge files. It is also not really used in applications.

GIF used to be all over the web but has fallen out of favor since it only supports a limited number of colors and is patented.

JPG/JPEG is mainly used for anything that is photo quality, though not for text. The lossy compression used tends to mar sharp lines.

PNG isn't as small as JPEG but is lossless so it's good for images with sharp lines. It's in common use on the web now.

Personally, I usually use PNG everywhere I can. It's a good compromise between JPG and GIF.

Choosing line type and color in Gnuplot 4.0

I know the question is old but I found this very helpful http://www.gnuplot.info/demo_canvas/dashcolor.html . So you can choose linetype and linecolor separately but you have to precede everything by "set termoption dash" (worked for me in gnuplot 4.4).

How to create windows service from java jar?

Another option is winsw: https://github.com/kohsuke/winsw/

Configure an xml file to specify the service name, what to execute, any arguments etc. And use the exe to install. Example xml: https://github.com/kohsuke/winsw/tree/master/examples

I prefer this to nssm, because it is one lightweight exe; and the config xml is easy to share/commit to source code.

PS the service is installed by running your-service.exe install

How to view transaction logs in SQL Server 2008

You can't read the transaction log file easily because that's not properly documented. There are basically two ways to do this. Using undocumented or semi-documented database functions or using third-party tools.

Note: This only makes sense if your database is in full recovery mode.

SQL Functions:

DBCC LOG and fn_dblog - more details here and here.

Third-party tools:

Toad for SQL Server and ApexSQL Log.

You can also check out several other topics where this was discussed:

Running Python on Windows for Node.js dependencies

For me, The issue was that i was using node's latest version and not the LTS version which is the stable version and recommended for most users.
Using the LTS Version solved the issue.
You can download from here :

LTS Version

Current Latest Version

Check if cookies are enabled

Cookies are Client-side and cannot be tested properly using PHP. That's the baseline and every solution is a wrap-around for this problem.

Meaning if you are looking a solution for your cookie problem, you are on the wrong way. Don'y use PHP, use a client language like Javascript.

Can you use cookies using PHP? Yes, but you have to reload to make the settings to PHP 'visible'.

For instance: Is a test possible to see if the browser can set Cookies with plain PHP'. The only correct answer is 'NO'.

Can you read an already set Cookie: 'YES' use the predefined $_COOKIE (A copy of the settings before you started PHP-App).

How to define custom sort function in javascript?

or shorter

_x000D_

function sortBy(field) {_x000D_
  return function(a, b) {_x000D_
    return (a[field] > b[field]) - (a[field] < b[field])_x000D_
  };_x000D_
}_x000D_
_x000D_
let myArray = [_x000D_
    {tabid: 6237, url: 'https://reddit.com/r/znation'},_x000D_
    {tabid: 8430, url: 'https://reddit.com/r/soccer'},_x000D_
    {tabid: 1400, url: 'https://reddit.com/r/askreddit'},_x000D_
    {tabid: 3620, url: 'https://reddit.com/r/tacobell'},_x000D_
    {tabid: 5753, url: 'https://reddit.com/r/reddevils'},_x000D_
]_x000D_
_x000D_
myArray.sort(sortBy('url'));_x000D_
console.log(myArray);

_x000D_

HashMap and int as key

For somebody who is interested in a such map because you want to reduce footprint of autoboxing in Java of wrappers over primitives types, I would recommend to use Eclipse collections. Trove isn't supported any more, and I believe it is quite unreliable library in this sense (though it is quite popular anyway) and couldn't be compared with Eclipse collections.

import org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap;

public class Check {
    public static void main(String[] args) {
        IntObjectHashMap map = new IntObjectHashMap();

        map.put(5,"It works");
        map.put(6,"without");
        map.put(7,"boxing!");

        System.out.println(map.get(5));
        System.out.println(map.get(6));
        System.out.println(map.get(7));
    }
}

In this example above IntObjectHashMap.

As you need int->object mapping, also consider usage of YourObjectType[] array or List<YourObjectType> and access values by index, as map is, by nature, an associative array with int type as index.

Curly braces in string in PHP

Example:

$number = 4;
print "You have the {$number}th edition book";
//output: "You have the 4th edition book";

Without curly braces PHP would try to find a variable named $numberth, that doesn't exist!

design a stack such that getMinimum( ) should be O(1)

struct Node {
    let data: Int
    init(_ d:Int){
        data = d
    }
}

struct Stack {
    private var backingStore = [Node]()
    private var minArray = [Int]()

    mutating func push(n:Node) {
        backingStore.append(n)
        minArray.append(n.data)
        minArray.sort(>)
        minArray
    }

    mutating func pop() -> Node? {
        if(backingStore.isEmpty){
            return nil
        }

        let n = backingStore.removeLast()

        var found = false
        minArray = minArray.filter{
            if (!found && $0 == n.data) {
                found = true
                return false
            }
            return true
        }
        return n
    }

    func min() -> Int? {
        return minArray.last
    }
}

Upload files with FTP using PowerShell

You can use this function :

function SendByFTP {
    param (
        $userFTP = "anonymous",
        $passFTP = "anonymous",
        [Parameter(Mandatory=$True)]$serverFTP,
        [Parameter(Mandatory=$True)]$localFile,
        [Parameter(Mandatory=$True)]$remotePath
    )
    if(Test-Path $localFile){
        $remoteFile = $localFile.Split("\")[-1]
        $remotePath = Join-Path -Path $remotePath -ChildPath $remoteFile
        $ftpAddr = "ftp://${userFTP}:${passFTP}@${serverFTP}/$remotePath"
        $browser = New-Object System.Net.WebClient
        $url = New-Object System.Uri($ftpAddr)
        $browser.UploadFile($url, $localFile)    
    }
    else{
        Return "Unable to find $localFile"
    }
}

This function send specified file by FTP. You must call the function with these parameters :

userFTP = "anonymous" by default or your username
passFTP = "anonymous" by default or your password
serverFTP = IP address of the FTP server
localFile = File to send
remotePath = the path on the FTP server

For example :

SendByFTP -userFTP "USERNAME" -passFTP "PASSWORD" -serverFTP "MYSERVER" -localFile "toto.zip" -remotePath "path/on/the/FTP/"

how to upload file using curl with php

Use:

if (function_exists('curl_file_create')) { // php 5.5+
  $cFile = curl_file_create($file_name_with_full_path);
} else { // 
  $cFile = '@' . realpath($file_name_with_full_path);
}
$post = array('extra_info' => '123456','file_contents'=> $cFile);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$target_url);
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
$result=curl_exec ($ch);
curl_close ($ch);

You can also refer:

http://blog.derakkilgo.com/2009/06/07/send-a-file-via-post-with-curl-and-php/

Important hint for PHP 5.5+:

Now we should use https://wiki.php.net/rfc/curl-file-upload but if you still want to use this deprecated approach then you need to set curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);

Use LINQ to get items in one List<>, that are not in another List<>

If you override the equality of People then you can also use:

peopleList2.Except(peopleList1)

Except should be significantly faster than the Where(...Any) variant since it can put the second list into a hashtable. Where(...Any) has a runtime of O(peopleList1.Count * peopleList2.Count) whereas variants based on HashSet<T> (almost) have a runtime of O(peopleList1.Count + peopleList2.Count).

Except implicitly removes duplicates. That shouldn't affect your case, but might be an issue for similar cases.

Or if you want fast code but don't want to override the equality:

var excludedIDs = new HashSet<int>(peopleList1.Select(p => p.ID));
var result = peopleList2.Where(p => !excludedIDs.Contains(p.ID));

This variant does not remove duplicates.

Automatically scroll down chat div

What you need to do is divide it into two divs. One with overflow set to scroll, and an inner one to hold the text so you can get it's outersize.

<div id="chatdiv">
    <div id="textdiv"/>
</div>

textdiv.html("");
$.each(chatMessages, function (i, e) {
    textdiv.append("<span>" + e + "</span><br/>");
});
chatdiv.scrollTop(textdiv.outerHeight());

You can check out a jsfiddle here: http://jsfiddle.net/xj5c3jcn/1/

Obviously you don't want to rebuild the whole text div each time, so take that with a grain of salt - just an example.

How to put a div in center of browser using CSS?

<html>
<head>
<style>
*
{
    margin:0;
    padding:0;
}

html, body
{
    height:100%;
}

#distance
{
    width:1px;
    height:50%;
    margin-bottom:-300px;
    float:left;
}


#something
{
    position:relative;
    margin:0 auto;
    text-align:left;
    clear:left;
    width:800px;
    min-height:600px;
    height:auto;
    border: solid 1px #993333;
    z-index: 0;
}

/* for Internet Explorer */
* html #something{
height: 600px;
}
</style>

</head>
<body>

<div id="distance"></div>

<div id="something">
</div>
</body>

</html>

Tested in FF2-3, IE6-7, Opera and works well!

Printing an int list in a single line python3

# Print In One Line Python

print('Enter Value')

n = int(input())

print(*range(1, n+1), sep="")

What is the proper declaration of main in C++?

From Standard docs., 3.6.1.2 Main Function,

It shall have a return type of type int, but otherwise its type is implementation-defined. All implementations shall allow both of the following definitions of main:

int main() { / ... / } and int main(int argc, char* argv[]) { / ... / }

In the latter form argc shall be the number of arguments passed to the program from the environment in which the program is run.If argc is nonzero these arguments shall be supplied in argv[0] through argv[argc-1] as pointers to the initial characters of null-terminated multibyte strings.....

Hope that helps..

AngularJS Error: Cross origin requests are only supported for protocol schemes: http, data, chrome-extension, https

The operation is not allowed in chrome. You can either use a HTTP server(Tomcat) or you use Firefox instead.

How can I set a custom date time format in Oracle SQL Developer?

I stumbled on this post while trying to change the display format for dates in sql-developer. Just wanted to add to this what I found out:

To Change the default display format, I would use the steps provided by ousoo i.e Tools > Preferences > ...
But a lot of times, I just want to retain the DEFAULT_FORMAT while modifying the format only during a bunch of related queries. That's when I would change the format of the session with the following:

alter SESSION set NLS_DATE_FORMAT = 'my_required_date_format'

Eg:

   alter SESSION set NLS_DATE_FORMAT = 'DD-MM-YYYY HH24:MI:SS'

How to parse a date?

We now have a more modern way to do this work.

java.time

The java.time framework is bundled with Java 8 and later. See Tutorial. These new classes are inspired by Joda-Time, defined by JSR 310, and extended by the ThreeTen-Extra project. They are a vast improvement over the troublesome old classes, java.util.Date/.Calendar et al.

Note that the 3-4 letter codes like EDT are neither standardized nor unique. Avoid them whenever possible. Learn to use ISO 8601 standard formats instead. The java.time framework may take a stab at translating, but many of the commonly used codes have duplicate values.

By the way, note how java.time by default generates strings using the ISO 8601 formats but extended by appending the name of the time zone in brackets.

String input = "Thu Jun 18 20:56:02 EDT 2009";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern ( "EEE MMM d HH:mm:ss zzz yyyy" , Locale.ENGLISH );
ZonedDateTime zdt = formatter.parse ( input , ZonedDateTime :: from );

Dump to console.

System.out.println ( "zdt : " + zdt );

When run.

zdt : 2009-06-18T20:56:02-04:00[America/New_York]

Adjust Time Zone

For fun let's adjust to the India time zone.

ZonedDateTime zdtKolkata = zdt.withZoneSameInstant ( ZoneId.of ( "Asia/Kolkata" ) );

zdtKolkata : 2009-06-19T06:26:02+05:30[Asia/Kolkata]

Convert to j.u.Date

If you really need a java.util.Date object for use with classes not yet updated to the java.time types, convert. Note that you are losing the assigned time zone, but have the same moment automatically adjusted to UTC.

java.util.Date date = java.util.Date.from( zdt.toInstant() );

How to delete a file or folder?

You can use the built-in pathlib module (requires Python 3.4+, but there are backports for older versions on PyPI: pathlib, pathlib2).

To remove a file there is the unlink method:

import pathlib
path = pathlib.Path(name_of_file)
path.unlink()

Or the rmdir method to remove an empty folder:

import pathlib
path = pathlib.Path(name_of_folder)
path.rmdir()

How to perform Join between multiple tables in LINQ lambda

take look at this sample code from my project

public static IList<Letter> GetDepartmentLettersLinq(int departmentId)
{
    IEnumerable<Letter> allDepartmentLetters =
        from allLetter in LetterService.GetAllLetters()
        join allUser in UserService.GetAllUsers() on allLetter.EmployeeID equals allUser.ID into usersGroup
        from user in usersGroup.DefaultIfEmpty()// here is the tricky part
        join allDepartment in DepartmentService.GetAllDepartments() on user.DepartmentID equals allDepartment.ID
        where allDepartment.ID == departmentId
        select allLetter;

    return allDepartmentLetters.ToArray();
}

in this code I joined 3 tables and I spited join condition from where clause

note: the Services classes are just warped(encapsulate) the database operations

Prevent any form of page refresh using jQuery/Javascript

Number (2) is possible by using a socket implementation (like websocket, socket.io, etc.) with a custom heartbeat for each session the user is engaged in. If a user attempts to open another window, you have a javascript handler check with the server if it's ok, and then respond with an error messages.

However, a better solution is to synchronize the two sessions if possible like in google docs.

iPad Web App: Detect Virtual Keyboard Using JavaScript in Safari?

This solution remembers the scroll position

    var currentscroll = 0;

    $('input').bind('focus',function() {
        currentscroll = $(window).scrollTop();
    });

    $('input').bind('blur',function() {
        if(currentscroll != $(window).scrollTop()){

        $(window).scrollTop(currentscroll);

        }
    });

Get real path from URI, Android KitKat new storage access framework

Note: This answer addresses part of the problem. For a complete solution (in the form of a library), look at Paul Burke's answer.

You could use the URI to obtain document id, and then query either MediaStore.Images.Media.EXTERNAL_CONTENT_URI or MediaStore.Images.Media.INTERNAL_CONTENT_URI (depending on the SD card situation).

To get document id:

// Will return "image:x*"
String wholeID = DocumentsContract.getDocumentId(uriThatYouCurrentlyHave);

// Split at colon, use second item in the array
String id = wholeID.split(":")[1];

String[] column = { MediaStore.Images.Media.DATA };     

// where id is equal to             
String sel = MediaStore.Images.Media._ID + "=?";

Cursor cursor = getContentResolver().
                          query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
                          column, sel, new String[]{ id }, null);

String filePath = "";

int columnIndex = cursor.getColumnIndex(column[0]);

if (cursor.moveToFirst()) {
    filePath = cursor.getString(columnIndex);
}   

cursor.close();

Reference: I'm not able to find the post that this solution is taken from. I wanted to ask the original poster to contribute here. Will look some more tonight.

How to use log4net in Asp.net core 2.0

I am porting a .Net Framework console app to .Net Core and found a similar issue with log files not getting created under certain circumstances.

When using "CreateRepository" there appears to be a difference between .net framework and .net standard.

Under .Net Framework this worked to create a unique Log instance with it's own filename using the same property from log4net.config

GlobalContext.Properties["LogName"] = LogName;
var loggerRepository = LogManager.CreateRepository(LogName);
XmlConfigurator.Configure(loggerRepository);

Under .Net Standard this didn't work and if you turn on tracing you see it can't find the configuration file ".config". It wasn't loading the previous known configuration. Once I added the configuration to the configurator it still didn't log, while not complaining about it either.

To get it working under .Net Standard with similar behavior as before, this is what I did.

var loggerRepository = LogManager.CreateRepository(LogName);
XmlConfigurator.Configure(loggerRepository,new FileInfo("log4net.config"));
var hierarchy = (Hierarchy) loggerRepository;
var appender = (RollingFileAppender)hierarchy.Root.GetAppender("RollingLogFileAppender");
appender.File = Path.Combine(Directory.GetCurrentDirectory(), "logs", $"{LogName}.log");

I didn't want to create a configuration file for every repo, so this works. Perhaps there is a better way to get the .Net Framework behavior as before and if there is please let me know below.

Checking if a list is empty with LINQ

List.Count is O(1) according to Microsoft's documentation:
http://msdn.microsoft.com/en-us/library/27b47ht3.aspx

so just use List.Count == 0 it's much faster than a query

This is because it has a data member called Count which is updated any time something is added or removed from the list, so when you call List.Count it doesn't have to iterate through every element to get it, it just returns the data member.

curl usage to get header

google.com is not responding to HTTP HEAD requests, which is why you are seeing a hang for the first command.

It does respond to GET requests, which is why the third command works.

As for the second, curl just prints the headers from a standard request.

Configure DataSource programmatically in Spring Boot

As an alternative way you can use DriverManagerDataSource such as:

public DataSource getDataSource(DBInfo db) {

    DriverManagerDataSource dataSource = new DriverManagerDataSource();

    dataSource.setUsername(db.getUsername());
    dataSource.setPassword(db.getPassword());
    dataSource.setUrl(db.getUrl());
    dataSource.setDriverClassName(db.getDriverClassName());

    return dataSource;
}

However be careful about using it, because:

NOTE: This class is not an actual connection pool; it does not actually pool Connections. It just serves as simple replacement for a full-blown connection pool, implementing the same standard interface, but creating new Connections on every call. reference

The smallest difference between 2 Angles

There is no need to compute trigonometric functions. The simple code in C language is:

#include <math.h>
#define PIV2 M_PI+M_PI
#define C360 360.0000000000000000000
double difangrad(double x, double y)
{
double arg;

arg = fmod(y-x, PIV2);
if (arg < 0 )  arg  = arg + PIV2;
if (arg > M_PI) arg  = arg - PIV2;

return (-arg);
}
double difangdeg(double x, double y)
{
double arg;
arg = fmod(y-x, C360);
if (arg < 0 )  arg  = arg + C360;
if (arg > 180) arg  = arg - C360;
return (-arg);
}

let dif = a - b , in radians

dif = difangrad(a,b);

let dif = a - b , in degrees

dif = difangdeg(a,b);

difangdeg(180.000000 , -180.000000) = 0.000000
difangdeg(-180.000000 , 180.000000) = -0.000000
difangdeg(359.000000 , 1.000000) = -2.000000
difangdeg(1.000000 , 359.000000) = 2.000000

No sin, no cos, no tan,.... only geometry!!!!

Code for best fit straight line of a scatter plot in python

Assuming line of best fit for a set of points is:

y = a + b * x

where:

b = ( sum(xi * yi) - n * xbar * ybar ) / sum((xi - xbar)^2)
a = ybar - b * xbar

Code and plot

# sample points 
X = [0, 5, 10, 15, 20]
Y = [0, 7, 10, 13, 20]

# solve for a and b
def best_fit(X, Y):

    xbar = sum(X)/len(X)
    ybar = sum(Y)/len(Y)
    n = len(X) # or len(Y)

    numer = sum([xi*yi for xi,yi in zip(X, Y)]) - n * xbar * ybar
    denum = sum([xi**2 for xi in X]) - n * xbar**2

    b = numer / denum
    a = ybar - b * xbar

    print('best fit line:\ny = {:.2f} + {:.2f}x'.format(a, b))

    return a, b

# solution
a, b = best_fit(X, Y)
#best fit line:
#y = 0.80 + 0.92x

# plot points and fit line
import matplotlib.pyplot as plt
plt.scatter(X, Y)
yfit = [a + b * xi for xi in X]
plt.plot(X, yfit)

UPDATE:

notebook version

Where and why do I have to put the "template" and "typename" keywords?

Preface

This post is meant to be an easy-to-read alternative to litb's post.

The underlying purpose is the same; an explanation to "When?" and "Why?" typename and template must be applied.

What's the purpose of `typename` and `template`?

typename and template are usable in circumstances other than when declaring a template.

There are certain contexts in C++ where the compiler must explicitly be told how to treat a name, and all these contexts have one thing in common; they depend on at least one template-parameter.

We refer to such names, where there can be an ambiguity in interpretation, as; "dependent names".

This post will offer an explanation to the relationship between dependent-names, and the two keywords.

A snippet says more than 1000 words

Try to explain what is going on in the following function-template, either to yourself, a friend, or perhaps your cat; what is happening in the statement marked (A)?

template<class T> void f_tmpl () { T::foo * x; /* <-- (A) */ }

It might not be as easy as one thinks, more specifically the result of evaluating (A) heavily depends on the definition of the type passed as template-parameter T.

Different Ts can drastically change the semantics involved.

struct X { typedef int       foo;       }; /* (C) --> */ f_tmpl<X> ();
struct Y { static  int const foo = 123; }; /* (D) --> */ f_tmpl<Y> ();

The two different scenarios:

If we instantiate the function-template with type X, as in (C), we will have a declaration of a pointer-to int named x, but;
if we instantiate the template with type Y, as in (D), (A) would instead consist of an expression that calculates the product of 123 multiplied with some already declared variable x.

The Rationale

The C++ Standard cares about our safety and well-being, at least in this case.

To prevent an implementation from potentially suffering from nasty surprises, the Standard mandates that we sort out the ambiguity of a dependent-name by explicitly stating the intent anywhere we'd like to treat the name as either a type-name, or a template-id.

If nothing is stated, the dependent-name will be considered to be either a variable, or a function.

How to handle dependent names?

If this was a Hollywood film, dependent-names would be the disease that spreads through body contact, instantly affects its host to make it confused. Confusion that could, possibly, lead to an ill-formed perso-, erhm.. program.

A dependent-name is any name that directly, or indirectly, depends on a template-parameter.

template<class T> void g_tmpl () {
   SomeTrait<T>::type                   foo; // (E), ill-formed
   SomeTrait<T>::NestedTrait<int>::type bar; // (F), ill-formed
   foo.data<int> ();                         // (G), ill-formed    
}

We have four dependent names in the above snippet:

E)
- "type" depends on the instantiation of SomeTrait<T>, which include T, and;
F)
- "NestedTrait", which is a template-id, depends on SomeTrait<T>, and;
- "type" at the end of (F) depends on NestedTrait, which depends on SomeTrait<T>, and;
G)
- "data", which looks like a member-function template, is indirectly a dependent-name since the type of foo depends on the instantiation of SomeTrait<T>.

Neither of statement (E), (F) or (G) is valid if the compiler would interpret the dependent-names as variables/functions (which as stated earlier is what happens if we don't explicitly say otherwise).

The solution

To make g_tmpl have a valid definition we must explicitly tell the compiler that we expect a type in (E), a template-id and a type in (F), and a template-id in (G).

template<class T> void g_tmpl () {
   typename SomeTrait<T>::type foo;                            // (G), legal
   typename SomeTrait<T>::template NestedTrait<int>::type bar; // (H), legal
   foo.template data<int> ();                                  // (I), legal
}

Every time a name denotes a type, all names involved must be either type-names or namespaces, with this in mind it's quite easy to see that we apply typename at the beginning of our fully qualified name.

template however, is different in this regard, since there's no way of coming to a conclusion such as; "oh, this is a template, then this other thing must also be a template". This means that we apply template directly in front of any name that we'd like to treat as such.

Can I just stick the keywords in front of any name?

"Can I just stick typename and template in front of any name? I don't want to worry about the context in which they appear..." - Some C++ Developer

The rules in the Standard states that you may apply the keywords as long as you are dealing with a qualified-name (K), but if the name isn't qualified the application is ill-formed (L).

namespace N {
  template<class T>
  struct X { };
}

         N::         X<int> a; // ...  legal
typename N::template X<int> b; // (K), legal
typename template    X<int> c; // (L), ill-formed

^{Note: Applying typename or template in a context where it is not required is not considered good practice; just because you can do something, doesn't mean that you should.}

Additionally there are contexts where typename and template are explicitly disallowed:

When specifying the bases of which a class inherits

Every name written in a derived class's base-specifier-list is already treated as a type-name, explicitly specifying typename is both ill-formed, and redundant.
```
                    // .------- the base-specifier-list
  template<class T> // v
  struct Derived      : typename SomeTrait<T>::type /* <- ill-formed */ {
    ...
  };
```

When the template-id is the one being referred to in a derived class's using-directive

  struct Base {
    template<class T>
    struct type { };
  };

  struct Derived : Base {
    using Base::template type; // ill-formed
    using Base::type;          // legal
  };

Eclipse - java.lang.ClassNotFoundException

Its very Old Jul (which year) but I had the same problem .

Actual issue found that eclipse was not able to generate class file for the java file , classpath was proper.

See the problem tab and check if your project is missing something/file. you can create a new proj and add files one by one and build them until it stops compiling and creating classes ( check the workspace/proj/bin/package/ folder for classes )

its wierd but true , ecplise was failing in compliation because 4 of 20 java files were using a single image which was missing. and as result none of the java file was compiled .

CLASSPATH is not a issue here.

AngularJS Uploading An Image With ng-upload

In my case above mentioned methods work fine with php but when i try to upload files with these methods in node.js then i have some problem. So instead of using $http({..,..,...}) use the normal jquery ajax.

For select file use this

<input type="file" name="file" onchange="angular.element(this).scope().uploadFile(this)"/>

And in controller

$scope.uploadFile = function(element) {   
var data = new FormData();
data.append('file', $(element)[0].files[0]);
jQuery.ajax({
      url: 'brand/upload',
      type:'post',
      data: data,
      contentType: false,
      processData: false,
      success: function(response) {
      console.log(response);
      },
      error: function(jqXHR, textStatus, errorMessage) {
      alert('Error uploading: ' + errorMessage);
      }
 });   
};

Internet Explorer cache location

If you want to find the folder in a platform independent way, you should query the registry key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Cache

how to convert a string to a bool

    private static readonly ICollection<string> PositiveList = new Collection<string> { "Y", "Yes", "T", "True", "1", "OK" };

public static bool ToBoolean(this string input)
{
                return input != null && PositiveList.Any(? => ?.Equals(input, StringComparison.OrdinalIgnoreCase));
}

Run git pull over all subdirectories

Original answer 2010:

If all of those directories are separate git repo, you should reference them as submodules.

That means your "origin" would be that remote repo 'plugins' which only contains references to subrepos 'cms', 'admin', 'chart'.

A git pull followed by a git submodule update would achieve what your are looking for.

Update January 2016:

With Git 2.8 (Q1 2016), you will be able to fetch submodules in parallel (!) with git fetch --recurse-submodules -j2.
See "How to speed up / parallelize downloads of git submodules using git clone --recursive?"

Hiding user input on terminal in Linux script

A bit different from (but mostly like) @lesmana's answer

stty -echo
read password
stty echo

simply: hide echo do your stuff show echo

Differences between ConstraintLayout and RelativeLayout

The only difference i've noted is that things set in a relative layout via drag and drop automatically have their dimensions relative to other elements inferred, so when you run the app what you see is what you get. However in the constraint layout even if you drag and drop an element in the design view, when you run the app things may be shifted around. This can easily be fixed by manually setting the constraints or, a more risky move being to right click the element in the component tree, selecting the constraint layout sub menu, then clicking 'infer constraints'. Hope this helps

Java: Static Class?

Final class and private constructor (good but not essential)
Public static methods

What USB driver should we use for the Nexus 5?

Everything else here failed for me initially (it kept coming up as an MTP device no matter how many times I uninstalled and restarted).

However, by going and enabling USB debugging, it worked. Just do this:

Uninstall the Nexus 5 driver
Disconnect from the computer
Enable developer options, see How to Enable Developer Options on the Nexus 5 & KitKat.
Enable USB debugging: Go to Settings -> Developer Options -> USB Debugging
Reconnect
It will probably fail to install all drivers. Go update the drivers as described in other answers.

django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb

On Ubuntu it is advised to use the distributions repository.

sudo apt-get install python-mysqldb

Transition of background-color

To me, it is better to put the transition codes with the original/minimum selectors than with the :hover or any other additional selectors:

_x000D_

#content #nav a {_x000D_
    background-color: #FF0;_x000D_
    _x000D_
    -webkit-transition: background-color 1000ms linear;_x000D_
    -moz-transition: background-color 1000ms linear;_x000D_
    -o-transition: background-color 1000ms linear;_x000D_
    -ms-transition: background-color 1000ms linear;_x000D_
    transition: background-color 1000ms linear;_x000D_
}_x000D_
_x000D_
#content #nav a:hover {_x000D_
    background-color: #AD310B;_x000D_
}

_x000D_

<div id="content">_x000D_
    <div id="nav">_x000D_
        <a href="#link1">Link 1</a>_x000D_
    </div>_x000D_
</div>

_x000D_

How can I import a database with MySQL from terminal?

Open the MySQL Command Line Client and type in your password
Change to the database you want to use for importing the .sql file data into. Do this by typing:
```
USE your_database_name
```
Now locate the .sql file you want to execute.
If the file is located in the main local C: drive directory and the .sql script file name is currentSqlTable.sql, you would type the following:
```
\. C:\currentSqlTable.sql
```
and press Enter to execute the SQL script file.

Convert array into csv

Add some improvements based on accepted answer.

PHP 7.0 Strict typing
PHP 7.0 Type declaration and Return type declaration
Enclosure \r, \n, \t
Don't enclosure empty string even $encloseAll is TRUE

/**
  * Formats a line (passed as a fields array) as CSV and returns the CSV as a string.
  * Adapted from https://www.php.net/manual/en/function.fputcsv.php#87120
  */
function arrayToCsv(array $fields, string $delimiter = ';', string $enclosure = '"', bool $encloseAll = false, bool $nullToMysqlNull = false): string {

    $delimiter_esc = preg_quote($delimiter, '/');
    $enclosure_esc = preg_quote($enclosure, '/');

    $output = [];
    foreach ($fields as $field) {
        if ($field === null && $nullToMysqlNull) {
            $output[] = 'NULL';
            continue;
        }
        // Enclose fields containing $delimiter, $enclosure or whitespace, newline
        $field = strval($field);
        if (strlen($field) && ($encloseAll || preg_match("/(?:${delimiter_esc}|${enclosure_esc}|\s|\r|\n|\t)/", $field))) {
            $output[] = $enclosure . str_replace($enclosure, $enclosure . $enclosure, $field) . $enclosure;
        } else {
            $output[] = $field;
        }
    }

    return implode($delimiter, $output);

}

how to set windows service username and password through commandline

This works:

sc.exe config "[servicename]" obj= "[.\username]" password= "[password]"

Where each of the [bracketed] items are replaced with the true arguments. (Keep the quotes, but don't keep the brackets.)

Just keep in mind that:

The spacing in the above example matters. obj= "foo" is correct; obj="foo" is not.
'.' is an alias to the local machine, you can specify a domain there (or your local computer name) if you wish.
Passwords aren't validated until the service is started
Quote your parameters, as above. You can sometimes get by without quotes, but good luck.

Detect Click into Iframe using JavaScript

You can do this to bubble events to parent document:

$('iframe').load(function() {
    var eventlist = 'click dblclick \
                    blur focus focusin focusout \
                    keydown keypress keyup \
                    mousedown mouseenter mouseleave mousemove mouseover mouseout mouseup mousemove \
                    touchstart touchend touchcancel touchleave touchmove';

    var iframe = $('iframe').contents().find('html');

    // Bubble events to parent
    iframe.on(eventlist, function(event) {
        $('html').trigger(event);
    });
});

Just extend the eventlist for more events.

How to use Python to login to a webpage and retrieve cookies for later usage?

import urllib, urllib2, cookielib

username = 'myuser'
password = 'mypassword'

cj = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
login_data = urllib.urlencode({'username' : username, 'j_password' : password})
opener.open('http://www.example.com/login.php', login_data)
resp = opener.open('http://www.example.com/hiddenpage.php')
print resp.read()

resp.read() is the straight html of the page you want to open, and you can use opener to view any page using your session cookie.

Failed to resolve version for org.apache.maven.archetypes

I simple use below steps:

Create Maven project -> check checkobox -> "Create a simple project (skip archetype selection)"

It works for me

gitbash command quick reference

from within the git bash shell type:

>cd /bin
>ls -l

You will then see a long listing of all the unix-like commands available. There are lots of goodies in there.

Using new line(\n) in string and rendering the same in HTML

Use <br /> for new line in html:

display_txt = display_txt.replace(/\n/g, "<br />");

How do I select a sibling element using jQuery?

Use jQuery .siblings() to select the matching sibling.

$(this).siblings('.bidbutton');

Stack smashing detected

You could try to debug the problem using valgrind:

The Valgrind distribution currently includes six production-quality tools: a memory error detector, two thread error detectors, a cache and branch-prediction profiler, a call-graph generating cache profiler, and a heap profiler. It also includes two experimental tools: a heap/stack/global array overrun detector, and a SimPoint basic block vector generator. It runs on the following platforms: X86/Linux, AMD64/Linux, PPC32/Linux, PPC64/Linux, and X86/Darwin (Mac OS X).

error: expected primary-expression before ')' token (C)

A function call needs to be performed with objects. You are doing the equivalent of this:

// function declaration/definition
void foo(int) {}

// function call
foo(int); // wat!??

i.e. passing a type where an object is required. This makes no sense in C or C++. You need to be doing

int i = 42;
foo(i);

foo(42);

MySQL INSERT INTO ... VALUES and SELECT

Try this:

INSERT INTO table1 SELECT "A string", 5, idTable2 FROM table2 WHERE ...

How to generate random number with the specific length in python

I really liked the answer of RichieHindle, however I liked the question as an exercise. Here's a brute force implementation using strings:)

import random
first = random.randint(1,9)
first = str(first)
n = 5

nrs = [str(random.randrange(10)) for i in range(n-1)]
for i in range(len(nrs))    :
    first += str(nrs[i])

print str(first)

Convert array to string in NodeJS

toString is a function, not a property. You'll want this:

console.log(aa.toString());

Alternatively, use join to specify the separator (toString() === join(','))

console.log(aa.join(' and '));

Elasticsearch error: cluster_block_exception [FORBIDDEN/12/index read-only / allow delete (api)], flood stage disk watermark exceeded

curl -XPUT -H "Content-Type: application/json" http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'

FROM

https://techoverflow.net/2019/04/17/how-to-fix-elasticsearch-forbidden-12-index-read-only-allow-delete-api/

Apache redirect to another port

Found this out by trial and error. If your configuration specifies a ServerName, then your VirtualHost directive will need to do the same. In the following example, awesome.example.com and amazing.example.com would both be forwarded to some local service running on port 4567.

ServerName example.com:80

<VirtualHost example.com:80>
  ProxyPreserveHost On
  ProxyRequests Off
  ServerName awesome.example.com
  ServerAlias amazing.example.com
  ProxyPass / http://localhost:4567/
  ProxyPassReverse / http://localhost:4567/
</VirtualHost>

I know this doesn't exactly answer the question, but I'm putting it here because this is the top search result for Apache port forwarding. So I figure it'll help somebody someday.

How to set TLS version on apache HttpClient

If you have a javax.net.ssl.SSLSocket class reference in your code, you can set the enabled TLS protocols by a call to SSLSocket.setEnabledProtocols():

import javax.net.ssl.*;
import java.net.*; 
...
Socket socket = SSLSocketFactory.getDefault().createSocket();
...
if (socket instanceof SSLSocket) {
   // "TLSv1.0" gives IllegalArgumentException in Java 8
   String[] protos = {"TLSv1.2", "TLSv1.1"}
   ((SSLSocket)socket).setEnabledProtocols(protos);
}

Hibernate - A collection with cascade=”all-delete-orphan” was no longer referenced by the owning entity instance

Instead of assigning new collection

public void setChildren(Set<ChildEntity> children) {
    this.children = children;
}

Replace all elements with

public void setChildren(Set<ChildEntity> children) {
    Collections.replaceAll(this.children,children);
}

How to set table name in dynamic SQL query?

To help guard against SQL injection, I normally try to use functions wherever possible. In this case, you could do:

...
SET @TableName = '<[db].><[schema].>tblEmployees'
SET @TableID   = OBJECT_ID(TableName) --won't resolve if malformed/injected.
...
SET @SQLQuery = 'SELECT * FROM ' + OBJECT_NAME(@TableID) + ' WHERE EmployeeID = @EmpID'

Meaning of = delete after function declaration

= 0 means that a function is pure virtual and you cannot instantiate an object from this class. You need to derive from it and implement this method
= delete means that the compiler will not generate those constructors for you. AFAIK this is only allowed on copy constructor and assignment operator. But I am not too good at the upcoming standard.

Why can't I shrink a transaction log file, even after backup?

This answer has been lifted from here and is posted here in case the other thread gets deleted:

The fact that you have non-distributed LSN in the log is the problem. I have seen this once before not sure why we dont unmark the transaction as replicated. We will investigate this internally. You can execute the following command to unmark the transaction as replicated

EXEC sp_repldone @xactid = NULL, @xact_segno = NULL, @numtrans = 0, @time = 0, @reset = 1

At this point you should be able to truncate the log.

Functions that return a function

Returning b is returning a function object. In Javascript, functions are just objects, like any other object. If you find that not helpful, just replace the word "object" with "thing". You can return any object from a function. You can return a true/false value. An integer (1,2,3,4...). You can return a string. You can return a complex object with multiple properties. And you can return a function. a function is just a thing.

In your case, returning b returns the thing, the thing is a callable function. Returning b() returns the value returned by the callable function.

Consider this code:

function b() {
   return 42;
}

Using the above definition, return b(); returns the value 42. On the other hand return b; returns a function, that itself returns the value of 42. They are two different things.

bootstrap datepicker change date event doesnt fire up when manually editing dates or clearing date

In version 2.1.5

bootstrap-datetimepicker.js
http://www.eyecon.ro/bootstrap-datepicker
Contributions:
Andrew Rowls
Thiago de Arruda
updated for Bootstrap v3 by Jonathan Peterson @Eonasdan

changeDate has been renamed to change.dp so changedate was not working for me

$("#datetimepicker").datetimepicker().on('change.dp', function (e) {
            FillDate(new Date());
    });

also needed to change css class from datepicker to datepicker-input

<div id='datetimepicker' class='datepicker-input input-group controls'>
   <input id='txtStartDate' class='form-control' placeholder='Select datepicker' data-rule-required='true' data-format='MM-DD-YYYY' type='text' />
   <span class='input-group-addon'>
       <span class='icon-calendar' data-time-icon='icon-time' data-date-icon='icon-calendar'></span>
   </span>
</div>

Date formate also works in capitals like this data-format='MM-DD-YYYY'

it might be helpful for someone it gave me really hard time :)

Python Pandas : group by in group by and average?

I would simply do this, which literally follows what your desired logic was:

df.groupby(['org']).mean().groupby(['cluster']).mean()

C# Clear all items in ListView

How about

DataSource = null;
DataBind();

What is the difference between fastcgi and fpm?

Running PHP as a CGI means that you basically tell your web server the location of the PHP executable file, and the server runs that executable

whereas

PHP FastCGI Process Manager (PHP-FPM) is an alternative FastCGI daemon for PHP that allows a website to handle strenuous loads. PHP-FPM maintains pools (workers that can respond to PHP requests) to accomplish this. PHP-FPM is faster than traditional CGI-based methods, such as SUPHP, for multi-user PHP environments

However, there are pros and cons to both and one should choose as per their specific use case.

I found info on this link for fastcgi vs fpm quite helpful in choosing which handler to use in my scenario.

How to disable "prevent this page from creating additional dialogs"?

I know everybody is ethically against this, but I understand there are reasons of practical joking where this is desired. I think Chrome took a solid stance on this by enforcing a mandatory one second separation time between alert messages. This gives the visitor just enough time to close the page or refresh if they're stuck on an annoying prank site.

So to answer your question, it's all a matter of timing. If you alert more than once per second, Chrome will create that checkbox. Here's a simple example of a workaround:

var countdown = 99;
function annoy(){
    if(countdown>0){
        alert(countdown+" bottles of beer on the wall, "+countdown+" bottles of beer! Take one down, pass it around, "+(countdown-1)+" bottles of beer on the wall!");
        countdown--;

        // Time must always be 1000 milliseconds, 999 or less causes the checkbox to appear
        setTimeout(function(){
            annoy();
        }, 1000);
    }
}

// Don't alert right away or Chrome will catch you
setTimeout(function(){
    annoy();
}, 1000);

Spring Boot application can't resolve the org.springframework.boot package

Try this, It might work for you too.

Open command prompt and go to the project folder.
Build project (For Maven, Run mvn clean install)
After successful build,
- Open your project on any IDE (intellij / eclipse).
- Restart your IDE incase it is already opened.

This worked for me on both v1.5 and v2.1

How do I create my own URL protocol? (e.g. so://...)

The first section is called a protocol and yes you can register your own. On Windows (where I'm assuming you're doing this given the C# tag - sorry Mono fans), it's done via the registry.

How to make a great R reproducible example

It's a good idea to use functions from the testthat package to show what you expect to occur. Thus, other people can alter your code until it runs without error. This eases the burden of those who would like to help you, because it means they don't have to decode your textual description. For example

library(testthat)
# code defining x and y
if (y >= 10) {
    expect_equal(x, 1.23)
} else {
    expect_equal(x, 3.21)
}

is clearer than "I think x would come out to be 1.23 for y equal to or exceeding 10, and 3.21 otherwise, but I got neither result". Even in this silly example, I think the code is clearer than the words. Using testthat lets your helper focus on the code, which saves time, and it provides a way for them to know they have solved your problem, before they post it

"Object doesn't support this property or method" error in IE11

This unfortunately breaks other things. Here is the fix I found on another site that seemed to work for me:

I'd say leave the X-UA-Compatible as "IE=8" and add the following code to the bottom of your master page:

<script language="javascript">
    /* IE11 Fix for SP2010 */
    if (typeof(UserAgentInfo) != 'undefined' && !window.addEventListener) 
    {
        UserAgentInfo.strBrowser=1; 
    } 
</script>

This fixes a bug in core.js which incorrectly calculates that sets UserAgentInfo.strBrowse=3 for IE11 and thus supporting addEventListener. I'm not entirely sure on the details other than that but the combination of keeping IE=8 and using this script is working for me. Fingers crossed until I find the next IE11/SharePoint "bug"!

how to change class name of an element by jquery

Instead of removeClass and addClass, you can also do it like this:

$('.IsBestAnswer').toggleClass('IsBestAnswer bestanswer');

Find oldest/youngest datetime object in a list

have u tried this :

>>> from datetime import datetime as DT
>>> l =[]
>>> l.append(DT(1988,12,12))
>>> l.append(DT(1979,12,12))
>>> l.append(DT(1979,12,11))
>>> l.append(DT(2011,12,11))
>>> l.append(DT(2022,12,11))
>>> min(l)
datetime.datetime(1979, 12, 11, 0, 0)
>>> max(l)
datetime.datetime(2022, 12, 11, 0, 0)

Regular Expression with wildcards to match any character

Without knowing the exact regex implementation you're making use of, I can only give general advice. (The syntax I will be perl as that's what I know, some languages will require tweaking)

Looking at ABC: (z) jan 02 1999 \n

The first thing to match is ABC: So using our regex is /ABC:/
You say ABC is always at the start of the string so /^ABC/ will ensure that ABC is at the start of the string.
You can match spaces with the \s (note the case) directive. With all directives you can match one or more with + (or 0 or more with *)
You need to escape the usage of ( and ) as it's a reserved character. so 
You can match any non space or newline character with .
You can match anything at all with .* but you need to be careful you're not too greedy and capture everything.

So in order to capture what you've asked. I would use /^ABC:\s*$.+?$\s*(.+)$/

Which I read as:

Begins with ABC:

May have some spaces

has (

has some characters

has )

may have some spaces

then capture everything until the end of the line (which is $).

I highly recommend keeping a copy of the following laying about http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/

Laravel: Get Object From Collection By Attribute

As from Laravel 5.5 you can use firstWhere()

In you case:

$green_foods = $foods->firstWhere('color', 'green');

Getting "type or namespace name could not be found" but everything seems ok?

You might also try eliminating the code you think you're having problems with and seeing if it compiles with no references to that code. If not, fix things until it compiles again, and then work your suspected problem code back in. Sometimes I get strange errors about classes or methods that I know are correct when the compiler doesn't like something else. Once I fix the thing that it's really getting hung up on, these 'phantom' errors disappear.

Assign multiple values to array in C

typedef struct{
  char array[4];
}my_array;

my_array array = { .array = {1,1,1,1} }; // initialisation

void assign(my_array a)
{
  array.array[0] = a.array[0];
  array.array[1] = a.array[1];
  array.array[2] = a.array[2];
  array.array[3] = a.array[3]; 
}

char num = 5;
char ber = 6;

int main(void)
{
  printf("%d\n", array.array[0]);
// ...

  // this works even after initialisation
  assign((my_array){ .array = {num,ber,num,ber} });

  printf("%d\n", array.array[0]);
// ....
  return 0;
}

Change size of text in text input tag?

The Javascript to change font size for an input control is:

input.style.fontSize = "16px";

Javascript: best Singleton pattern

Why use a constructor and prototyping for a single object?

The above is equivalent to:

var earth= {
    someMethod: function () {
        if (console && console.log)
            console.log('some method');                             
    }
};
privateFunction1();
privateFunction2();

return {
    Person: Constructors.Person,
    PlanetEarth: earth
};

How can a LEFT OUTER JOIN return more records than exist in the left table?

Could it be a one to many relationship between the left and right tables?

Getting rid of bullet points from <ul>

your code:

ul#otis {
    list-style-type: none;
}

my suggestion:

#otis {
    list-style-type: none;

}

in css you need only use the #id not element#id. more helpful hints are provided here: w3schools

Converting string to byte array in C#

You could use MemoryMarshal API to perform very fast and efficient conversion. String will implicitly be cast to ReadOnlySpan<byte>, as MemoryMarshal.Cast accepts either Span<byte> or ReadOnlySpan<byte> as an input parameter.

public static class StringExtensions
{
    public static byte[] ToByteArray(this string s) => s.ToByteSpan().ToArray(); //  heap allocation, use only when you cannot operate on spans
    public static ReadOnlySpan<byte> ToByteSpan(this string s) => MemoryMarshal.Cast<char, byte>(s);
}

Following benchmark shows the difference:

Input: "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,"

|                       Method |       Mean |     Error |    StdDev |  Gen 0 | Gen 1 | Gen 2 | Allocated |
|----------------------------- |-----------:|----------:|----------:|-------:|------:|------:|----------:|
| UsingEncodingUnicodeGetBytes | 160.042 ns | 3.2864 ns | 6.4099 ns | 0.0780 |     - |     - |     328 B |
| UsingMemoryMarshalAndToArray |  31.977 ns | 0.7177 ns | 1.5753 ns | 0.0781 |     - |     - |     328 B |
|           UsingMemoryMarshal |   1.027 ns | 0.0565 ns | 0.1630 ns |      - |     - |     - |         - |

How to get row data by clicking a button in a row in an ASP.NET gridview

 protected void btnS10_click(object sender, EventArgs e)
    {
        foreach (GridViewRow row in Grd.Rows)
        {
            CheckBox chk_Single = (CheckBox)row.FindControl("ChkSendOne");
            if (row.RowType == DataControlRowType.DataRow)
            {
                string id = (row.Cells[0].FindControl("lblSNo") as Label).Text;
                if (Convert.ToInt32(id) <= 10)
                {
                   
                    chk_Single.Checked = true;
                    if (chk_Single.Checked == true)
                    {
                        lblSelectedRecord.InnerText = (Convert.ToInt32(lblSelectedRecord.InnerText) + 1).ToString();
                    }
                }
            }
        }
    }

cmake - find_library - custom library location

Use CMAKE_PREFIX_PATH by adding multiple paths (separated by semicolons and no white spaces). You can set it as an environmental variable to avoid having absolute paths in your cmake configuration files

Notice that cmake will look for config file in any of the following folders where is any of the path in CMAKE_PREFIX_PATH and name is the name of the library you are looking for

<prefix>/                                               (W)
<prefix>/(cmake|CMake)/                                 (W)
<prefix>/<name>*/                                       (W)
<prefix>/<name>*/(cmake|CMake)/                         (W)
<prefix>/(lib/<arch>|lib|share)/cmake/<name>*/          (U)
<prefix>/(lib/<arch>|lib|share)/<name>*/                (U)
<prefix>/(lib/<arch>|lib|share)/<name>*/(cmake|CMake)/  (U)

In your case you need to add to CMAKE_PREFIX_PATH the following two paths:

D:/develop/cmake/libs/libA;D:/develop/cmake/libB

Chart.js - Formatting Y axis

Here you can find a good example of how to format Y-Axis value.

Also, you can use scaleLabel : "<%=value%>" that you mentioned, It basically means that everything between <%= and %> tags will be treated as javascript code (i.e you can use if statments...)

How to select the last record from MySQL table using SQL syntax

You could also do something like this:

SELECT tb1.* FROM Table tb1 WHERE id = (SELECT MAX(tb2.id) FROM Table tb2);

Its useful when you want to make some joins.

How to remove the focus from a TextBox in WinForms?

Please try set TabStop to False for your view control which is not be focused.

For eg:

txtEmpID.TabStop = false;

In Python, how do I create a string of n characters in one line of code?

The first ten lowercase letters are string.lowercase[:10] (if you have imported the standard library module string previously, of course;-).

Other ways to "make a string of 10 characters": 'x'*10 (all the ten characters will be lowercase xs;-), ''.join(chr(ord('a')+i) for i in xrange(10)) (the first ten lowercase letters again), etc, etc;-).

Is it possible to delete an object's property in PHP?

unset($a->new_property);

This works for array elements, variables, and object attributes.

Example:

$a = new stdClass();

$a->new_property = 'foo';
var_export($a);  // -> stdClass::__set_state(array('new_property' => 'foo'))

unset($a->new_property);
var_export($a);  // -> stdClass::__set_state(array())

Comparing two .jar files

In Linux/CygWin a handy script I use at times is:

#Extract the jar (war or ear)
cd dir1
jar xvf jar-file1
for i in `ls *.class`
do
 javap $i > ${i}.txt #list the functions/variables etc
done

cd dir2
jar xvf jar-file2
for i in `ls *.class`
do
 javap $i > ${i}.txt #list the functions/variables etc
done

diff -r dir1 dir2 #diff recursively

GROUP BY + CASE statement

For TSQL I like to encapsulate case statements in an outer apply. This prevents me from having to have the case statement written twice, allows reference to the case statement by alias in future joins and avoids the need for positional references.

select oa.day, 
model.name, 
attempt.type, 
oa.result
COUNT(*) MyCount 
FROM attempt attempt, prod_hw_id prod_hw_id, model model
WHERE time >= '2013-11-06 00:00:00'  
AND time < '2013-11-07 00:00:00'
AND attempt.hard_id = prod_hw_id.hard_id
AND prod_hw_id.model_id = model.model_id
OUTER APPLY (
    SELECT CURRENT_DATE-1 AS day,
     CASE WHEN attempt.result = 0 THEN 0 ELSE 1 END result
    ) oa    
group by oa.day, 
model.name, 
attempt.type, 
oa.result
order by model.name, attempt.type, oa.result;

How to remove leading and trailing zeros in a string? Python

str.strip is the best approach for this situation, but more_itertools.strip is also a general solution that strips both leading and trailing elements from an iterable:

Code

import more_itertools as mit


iterables = ["231512-n\n","  12091231000-n00000","alphanum0000", "00alphanum"]
pred = lambda x: x in {"0", "\n", " "}
list("".join(mit.strip(i, pred)) for i in iterables)
# ['231512-n', '12091231000-n', 'alphanum', 'alphanum']

Details

Notice, here we strip both leading and trailing "0"s among other elements that satisfy a predicate. This tool is not limited to strings.

Android Activity without ActionBar

There are multiple ways of doing this.

1) Change the theme in Android Manifest

Below the Application element, you will find theme tag. Replace it with this one -

android:theme="@android:style/Theme.NoTitleBar"

If you are using AppCompat, use @android:style/Theme.AppCompat.NoActionBar.

This will set the theme for all activities. If you don't need the action bar in a specific acitivity, then set the theme in the activity container, ie

<activity android:theme="@android:style/Theme.NoTitleBar" ...>

You may also set android:theme="@android:style/Theme.NoTitleBar" theme in the styles and use it later on.

2) Create a Custom Theme

Add this in res/values/styles.xml

<style name="NoActionBar" parent="@android:style/Theme.Holo.Light">
     <item name="windowActionBar">false</item>
     <item name="android:windowNoTitle">true</item>
</style>

and then set it as your activity's theme in Manifest:

<activity android:theme="@style/NoActionBar" ... />

3) Dynamically Remove the Action Bar

Put this code in the onCreate method before setting content view -

getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
getActionBar().hide();

If you are using the support library use getSupportActionBar().

Java - Convert int to Byte Array of 4 Bytes?

You can convert yourInt to bytes by using a ByteBuffer like this:

return ByteBuffer.allocate(4).putInt(yourInt).array();

Beware that you might have to think about the byte order when doing so.

Image change every 30 seconds - loop

Just use That.Its Easy.

<script language="javascript" type="text/javascript">
     var images = new Array()
     images[0] = "img1.jpg";
     images[1] = "img2.jpg";
     images[2] = "img3.jpg";
     setInterval("changeImage()", 30000);
     var x=0;

     function changeImage()
     {
                document.getElementById("img").src=images[x]
                x++;
                if (images.length == x) 
                {
                    x = 0;
                }
     }
</script>

And in Body Write this Code:-

<img id="img" src="imgstart.jpg">

Datatype for storing ip address in SQL Server

I like the functions of SandRock. But I found an error in the code of dbo.fn_ConvertIpAddressToBinary. The incoming parameter of @ipAddress VARCHAR(39) is too small when you concat the @delim to it.

SET @ipAddress = @ipAddress + @delim

You can increase it to 40. Or better yet use a new variable that is bigger and use that internally. That way you don't lose the last pair on large numbers.

SELECT dbo.fn_ConvertIpAddressToBinary('ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff')

How to use activity indicator view on iPhone?

in regards to:

Take a look at the open source WordPress application. They have a very re-usable window they have created for displaying an "activity in progress" type display over top of whatever view your application is currently displaying.

note that if you do utilise this code you MUST provide ALL the sourcecode to your own application to any user that requests it. You need to be aware that they may decide to repackage your code and sell it on the store themselves. This is all provided for under the terms of the GNU General Public License (GPL).

If you don't want to be forced into opening your sourcecode then you cannot use anything from the wordpress iphone application including the, referenced activity progress window, without forcing the GPL to apply to your own.

Get value from JToken that may not exist (best practices)

TYPE variable = jsonbody["key"]?.Value<TYPE>() ?? DEFAULT_VALUE;

e.g.

bool attachMap = jsonbody["map"]?.Value<bool>() ?? false;

Can't create a docker image for COPY failed: stat /var/lib/docker/tmp/docker-builder error

In your case removing ./ should solve the issue. I had another case wherein I was using a directory from the parent directory and docker can only access files present below the directory where Dockerfile is present so if I have a directory structure /root/dir and Dockerfile /root/dir/Dockerfile

I cannot copy do the following

COPY root/src /opt/src

MVC4 HTTP Error 403.14 - Forbidden

I had set the new app's application pool to the DefaultAppPool in IIS which obviously is using the Classic pipeline with .NET v.2.0.

To solve the problem I created a new App Pool using the Integrated pipeline and .NET v4.0. just for this new application and then everything started working as expected.

Don't forget to assign this new app pool to the application. Select the application in IIS, click Basic Settings and then pick the new app pool for the app.

android: how to change layout on button click?

You wanted to change the layout at runtime on button click. But that is not possible and as it has been rightly stated above, you need to restart the activity. You will come across a similar problem when u plan on changing the theme based on user's selection but it will not reflect in runtime. You will have to restart the activity.

How do I make a relative reference to another workbook in Excel?

Using =worksheetname() and =Indirect() function, and naming the worksheets in the parent Excel file with the name of the externally referenced Excel file. Each externally referenced excel file were in their own folders with same name. These sub-folders were only to create more clarity.

What I did was as follows:-

|----Column B---------------|----Column C------------|

R2) Parent folder --------> "C:\TEMP\Excel\"

R3) Sub folder name ---> =worksheetname()

R5) Full path --------------> ="'"&C2&C3&"["&C3&".xlsx]Sheet1'!$A$1"

R7) Indirect function-----> =INDIRECT(C5,TRUE)

In the main file, I had say, 5 worksheets labeled as Ext-1, Ext-2, Ext-3, Ext-4, Ext-5. Copy pasted the above formulas into all the five worksheets. Opened all the respectively named Excel files in the background. For some reason the results were not automatically computing, hence had to force a change by editing any cell. Volla, the value in cell A1 of each externally referenced Excel file were in the Main file.

How to set String's font size, style in Java using the Font class?

Font myFont = new Font("Serif", Font.BOLD, 12);, then use a setFont method on your components like

JButton b = new JButton("Hello World");
b.setFont(myFont);

How to read a .xlsx file using the pandas Library in iPython?

I usually create a dictionary containing a DataFrame for every sheet:

xl_file = pd.ExcelFile(file_name)

dfs = {sheet_name: xl_file.parse(sheet_name) 
          for sheet_name in xl_file.sheet_names}

Update: In pandas version 0.21.0+ you will get this behavior more cleanly by passing sheet_name=None to read_excel:

dfs = pd.read_excel(file_name, sheet_name=None)

In 0.20 and prior, this was sheetname rather than sheet_name (this is now deprecated in favor of the above):

dfs = pd.read_excel(file_name, sheetname=None)

VBA to copy a file from one directory to another

One thing that caused me a massive headache when using this code (might affect others and I wish that somebody had left a comment like this one here for me to read):

My aim is to create a dynamic access dashboard, which requires that its linked tables be updated.
I use the copy methods described above to replace the existing linked CSVs with an updated version of them.
Running the above code manually from a module worked fine.
Running identical code from a form linked to the CSV data had runtime error 70 (Permission denied), even tho the first step of my code was to close that form (which should have unlocked the CSV file so that it could be overwritten).
I now believe that despite the form being closed, it keeps the outdated CSV file locked while it executes VBA associated with that form.

My solution will be to run the code (On timer event) from another hidden form that opens with the database.

How to create number input field in Flutter?

Through this option you can strictly restricted another char with out number.

 inputFormatters: [FilteringTextInputFormatter.digitsOnly],
 keyboardType: TextInputType.number,

For using above option you have to import this

import 'package:flutter/services.dart';

using this kind of option user can not paste char in a textfield

moment.js get current time in milliseconds?

To get the current time's milliseconds, use http://momentjs.com/docs/#/get-set/millisecond/

var timeInMilliseconds = moment().milliseconds();

System.Collections.Generic.List does not contain a definition for 'Select'

This question's bit old, but, there's a tricky scenario which also leads to this error:

In controller:

ViewBag.id = //id from querystring
List<string> = GrabDataFromDBByID(ViewBag.id).Select(a=>a.ToString());

The above code will lead to an error in this part: .Select(a=>a.ToString()) because of the below reason: You're passing a ViewBag.id to a method which in compiler, it doesn't know the type, so there might be several methods with the same name and different parameters let's say:

GrabDataFromDBByID(string)
GrabDataFromDBByID(int)
GrabDataFromDBByID(whateverType)

So to prevent this case, either explicitly cast the ViewBag or create another variable storing it.

Temporarily change current working directory in bash to run a command

bash has a builtin

pushd SOME_PATH
run_stuff
...
...
popd

Have a fixed position div that needs to scroll if content overflows

Here are both fixes.

First, regarding the fixed sidebar, you need to give it a height for it to overflow:

HTML Code:

<div id="sidebar">Menu</div>
<div id="content">Text</div>

CSS Code:

body {font:76%/150% Arial, Helvetica, sans-serif; color:#666; width:100%; height:100%;}
#sidebar {position:fixed; top:0; left:0; width:20%; height:100%; background:#EEE; overflow:auto;}
#content {width:80%; padding-left:20%;}

@media screen and (max-height:200px){
    #sidebar {color:blue; font-size:50%;}
}

Live example: http://jsfiddle.net/RWxGX/3/

It's impossible NOT to get a scroll bar if your content overflows the height of the div. That's why I've added a media query for screen height. Maybe you can adjust your styles for short screen sizes so the scroll doesn't need to appear.

Cheers, Ignacio

Convert textbox text to integer

int num = int.Parse(textBox.Text);

try this. It worked for me

How to insert a newline in front of a pattern?

On my mac, the following inserts a single 'n' instead of newline:

sed 's/regexp/\n&/g'

This replaces with newline:

sed "s/regexp/\\`echo -e '\n\r'`/g"

How to convert image into byte array and byte array to base64 String in android?

They have wrapped most stuff need to solve your problem, one of the tests looks like this:

String filename = CSSURLEmbedderTest.class.getResource("folder.png").getPath().replace("%20", " ");
String code = "background: url(folder.png);";

StringWriter writer = new StringWriter();
embedder = new CSSURLEmbedder(new StringReader(code), true);
embedder.embedImages(writer, filename.substring(0, filename.lastIndexOf("/")+1));

String result = writer.toString();
assertEquals("background: url(" + folderDataURI + ");", result);

Difference between margin and padding?

The simplest defenition is ; padding is a space given inside the border of the container element and margin is given outside. For a element which is not a container, padding may not make much sense, but margin defenitly will help to arrange it.

where to place CASE WHEN column IS NULL in this query

Not able to understand your actual problem but your case statement is incorrect

CASE 
WHEN 
TABLE3.COL3 IS NULL
THEN TABLE2.COL3
ELSE
TABLE3.COL3
END 
AS
COL4

Can you call Directory.GetFiles() with multiple filters?

I know it's old question but LINQ: (.NET40+)

var files = Directory.GetFiles("path_to_files").Where(file => Regex.IsMatch(file, @"^.+\.(wav|mp3|txt)$"));

Java optional parameters

Overloading is fine, but if there's a lot of variables that needs default value, you will end up with :

public void methodA(A arg1) {  }
public void methodA( B arg2,) {  }
public void methodA(C arg3) {  }
public void methodA(A arg1, B arg2) {  }
public void methodA(A arg1, C arg3) {  }
public void methodA( B arg2, C arg3) {  }
public void methodA(A arg1, B arg2, C arg3) {  }

So I would suggest use the Variable Argument provided by Java. Here's a link for explanation.

How can I count text lines inside an DOM element? Can I?

getClientRects return the client rects like this and if you want to get the lines, use the follow function like this

function getRowRects(element) {
    var rects = [],
        clientRects = element.getClientRects(),
        len = clientRects.length,
        clientRect, top, rectsLen, rect, i;

    for(i=0; i<len; i++) {
        has = false;
        rectsLen = rects.length;
        clientRect = clientRects[i];
        top = clientRect.top;
        while(rectsLen--) {
            rect = rects[rectsLen];
            if (rect.top == top) {
                has = true;
                break;
            }
        }
        if(has) {
            rect.right = rect.right > clientRect.right ? rect.right : clientRect.right;
            rect.width = rect.right - rect.left;
        }
        else {
            rects.push({
                top: clientRect.top,
                right: clientRect.right,
                bottom: clientRect.bottom,
                left: clientRect.left,
                width: clientRect.width,
                height: clientRect.height
            });
        }
    }
    return rects;
}

Best way to do multi-row insert in Oracle?

Whenever I need to do this I build a simple PL/SQL block with a local procedure like this:

declare
   procedure ins
   is
      (p_exch_wh_key INTEGER, 
       p_exch_nat_key INTEGER, 
       p_exch_date DATE, exch_rate NUMBER, 
       p_from_curcy_cd VARCHAR2, 
       p_to_curcy_cd VARCHAR2, 
       p_exch_eff_date DATE, 
       p_exch_eff_end_date DATE, 
       p_exch_last_updated_date DATE);
   begin
      insert into tmp_dim_exch_rt 
      (exch_wh_key, 
       exch_nat_key, 
       exch_date, exch_rate, 
       from_curcy_cd, 
       to_curcy_cd, 
       exch_eff_date, 
       exch_eff_end_date, 
       exch_last_updated_date) 
      values
      (p_exch_wh_key, 
       p_exch_nat_key, 
       p_exch_date, exch_rate, 
       p_from_curcy_cd, 
       p_to_curcy_cd, 
       p_exch_eff_date, 
       p_exch_eff_end_date, 
       p_exch_last_updated_date);
   end;
begin
   ins (1, 1, '28-AUG-2008', 109.49, 'USD', 'JPY', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008'),
   ins (2, 1, '28-AUG-2008', .54, 'USD', 'GBP', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008'),
   ins (3, 1, '28-AUG-2008', 1.05, 'USD', 'CAD', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008'),
   ins (4, 1, '28-AUG-2008', .68, 'USD', 'EUR', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008'),
   ins (5, 1, '28-AUG-2008', 1.16, 'USD', 'AUD', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008'),
   ins (6, 1, '28-AUG-2008', 7.81, 'USD', 'HKD', '28-AUG-2008', '28-AUG-2008', '28-AUG-2008');
end;
/

Move all files except one

If you use bash and have the extglob shell option set (which is usually the case):

mv ~/Linux/Old/!(Tux.png) ~/Linux/New/

How to have an auto incrementing version number (Visual Studio)?

If you put an asterisk in for build and revision visual studio uses the number of days since Jan. 1st 2000 as the build number, and the number of seconds since midnight divided by 2 as the revision.

A MUCH better life saver solution is http://autobuildversion.codeplex.com/

It works like a charm and it's VERY flexible.

Set a thin border using .css() in javascript

After a few futile hours battling with a 'SyntaxError: missing : after property id' message I can now expand on this topic:

border-width is a valid css property but it is not included in the jQuery css oject definition, so .css({border-width: '2px'}) will cause an error, but it's quite happy with .css({'border-width': '2px'}), presumably property names in quotes are just passed on as received.

How can I get dict from sqlite query?

Shorter version:

db.row_factory = lambda c, r: dict([(col[0], r[idx]) for idx, col in enumerate(c.description)])

Reading a .txt file using Scanner class in Java

The file you read in must have exactly the file name you specify: "10_random" not "10_random.txt" not "10_random.blah", it must exactly match what you are asking for. You can change either one to match so that they line up, but just be sure they do. It may help to show the file extensions in whatever OS you're using.

Also, for file location, it must be located in the working directory (same level) as the final executable (the .class file) that is the result of compilation.

How to retrieve available RAM from Windows command line?

wmic OS get TotalVisibleMemorySize /Value

Note not TotalPhysicalMemory as suggested elsewhere

Regarding Java switch statements - using return and omitting breaks in each case

If you're going to have a method that just runs the switch and then returns some value, then sure this way works. But if you want a switch with other stuff in a method then you can't use return or the rest of the code inside the method will not execute. Notice in the tutorial how it has a print after the code? Yours would not be able to do this.

Can't append <script> element

Another way you can do it if you want to append code is using the document.createElement method but then using .innerHTML instead of .src.

var script = document.createElement( 'script' );
script.type = 'text/javascript';
script.innerHTML = 'alert("Hey there... you just appended this script to the body");';
$("body").append( script );

Get text of the selected option with jQuery

Close, you can use

$('#select_2 option:selected').html()

How to get GMT date in yyyy-mm-dd hh:mm:ss in PHP

You are repeating the y,m,d.

Instead of

gmdate('yyyy-mm-dd hh:mm:ss \G\M\T', time());

You should use it like

gmdate('Y-m-d h:m:s \G\M\T', time());

Provisioning Profiles menu item missing from Xcode 5

Provisioning files are located in:

/Users/${USER}/Library/MobileDevice/Provisioning Profiles/

Just remove the out-of-date files.

Open page in new window without popup blocking

PS> I posted this answer on a related question. Here's how I got round the issue of my async ajax request losing the trusted context:

I opened the popup directly on the users click, directed the url to about:blank and got a handle on that window. You could probably direct the popup to a 'loading' url while your ajax request is made

var myWindow = window.open("about:blank",'name','height=500,width=550');

Then, when my request is successful, I open my callback url in the window

function showWindow(win, url) {
     win.open(url,'name','height=500,width=550');
}

Entry point for Java applications: main(), init(), or run()?

The main() method is the entry point for a Java application. run() is typically used for new threads or tasks.

Where have you been writing a run() method, what kind of application are you writing (e.g. Swing, AWT, console etc) and what's your development environment?

How to align center the text in html table row?

Try to put this in your CSS file.

td {
    text-align: center;
    vertical-align: middle;
}

pandas three-way joining multiple dataframes on columns

The three dataframes are

Let's merge these frames using nested pd.merge

Here we go, we have our merged dataframe.

Happy Analysis!!!

Differences between time complexity and space complexity?

Yes, this is definitely possible. For example, sorting n real numbers requires O(n) space, but O(n log n) time. It is true that space complexity is always a lowerbound on time complexity, as the time to initialize the space is included in the running time.

Add a column in a table in HIVE QL

You cannot add a column with a default value in Hive. You have the right syntax for adding the column ALTER TABLE test1 ADD COLUMNS (access_count1 int);, you just need to get rid of default sum(max_count). No changes to that files backing your table will happen as a result of adding the column. Hive handles the "missing" data by interpreting NULL as the value for every cell in that column.

So now your have the problem of needing to populate the column. Unfortunately in Hive you essentially need to rewrite the whole table, this time with the column populated. It may be easier to rerun your original query with the new column. Or you could add the column to the table you have now, then select all of its columns plus value for the new column.

You also have the option to always COALESCE the column to your desired default and leave it NULL for now. This option fails when you want NULL to have a meaning distinct from your desired default. It also requires you to depend on always remembering to COALESCE.

If you are very confident in your abilities to deal with the files backing Hive, you could also directly alter them to add your default. In general I would recommend against this because most of the time it will be slower and more dangerous. There might be some case where it makes sense though, so I've included this option for completeness.

How can I use jQuery to move a div across the screen

Here i have done complete bins for above query. below is demo link, i think it may help you

Demo: http://codebins.com/bin/4ldqp9b/1

HTML:

<div id="edge">
  <div class="box" style="top:20; background:#f8a2a4;">
  </div>
  <div class="box" style="top:70; background:#a2f8a4;">
  </div>
  <div class="box" style="top:120; background:#5599fd;">
  </div>
</div>
<br/>
<input type="button" id="btnAnimate" name="btnAnimate" value="Animate" />

CSS:

body{
  background:#ffffef;
}
#edge{
  width:500px;
  height:200px;
  border:1px solid #3377af;
  padding:5px;
}

.box{
  position:absolute;
  left:10;
  width:40px;
  height:40px;
  border:1px solid #a82244;
}

JQuery:

$(function() {
    $("#btnAnimate").click(function() {
        var move = "";
        if ($(".box:eq(0)").css('left') == "10px") {
            move = "+=" + ($("#edge").width() - 35);
        } else {
            move = "-=" + ($("#edge").width() - 35);
        }
        $(".box").animate({
            left: move
        }, 500, function() {
            if ($(".box:eq(0)").css('left') == "475px") {
                $(this).css('background', '#afa799');
            } else {
                $(".box:eq(0)").css('background', '#f8a2a4');
                $(".box:eq(1)").css('background', '#a2f8a4');
                $(".box:eq(2)").css('background', '#5599fd');
            }

        });
    });
});

Demo: http://codebins.com/bin/4ldqp9b/1

How do I copy the contents of one stream to another?

For .NET 3.5 and before try :

MemoryStream1.WriteTo(MemoryStream2);

Setting action for back button in navigation controller

Swift Version:

(of https://stackoverflow.com/a/19132881/826435)

In your view controller you just conform to a protocol and perform whatever action you need:

extension MyViewController: NavigationControllerBackButtonDelegate {
    func shouldPopOnBackButtonPress() -> Bool {
        performSomeActionOnThePressOfABackButton()
        return false
    }
}

Then create a class, say NavigationController+BackButton, and just copy-paste the code below:

protocol NavigationControllerBackButtonDelegate {
    func shouldPopOnBackButtonPress() -> Bool
}

extension UINavigationController {
    public func navigationBar(_ navigationBar: UINavigationBar, shouldPop item: UINavigationItem) -> Bool {
        // Prevents from a synchronization issue of popping too many navigation items
        // and not enough view controllers or viceversa from unusual tapping
        if viewControllers.count < navigationBar.items!.count {
            return true
        }

        // Check if we have a view controller that wants to respond to being popped
        var shouldPop = true
        if let viewController = topViewController as? NavigationControllerBackButtonDelegate {
            shouldPop = viewController.shouldPopOnBackButtonPress()
        }

        if (shouldPop) {
            DispatchQueue.main.async {
                self.popViewController(animated: true)
            }
        } else {
            // Prevent the back button from staying in an disabled state
            for view in navigationBar.subviews {
                if view.alpha < 1.0 {
                    UIView.animate(withDuration: 0.25, animations: {
                        view.alpha = 1.0
                    })
                }
            }

        }

        return false
    }
}

HTML input file selection event not firing upon selecting the same file

In this article, under the title "Using form input for selecting"

http://www.html5rocks.com/en/tutorials/file/dndfiles/

<input type="file" id="files" name="files[]" multiple />

<script>
function handleFileSelect(evt) {

    var files = evt.target.files; // FileList object

    // files is a FileList of File objects. List some properties.
    var output = [];
    for (var i = 0, f; f = files[i]; i++) {
     // Code to execute for every file selected
    }
    // Code to execute after that

}

document.getElementById('files').addEventListener('change', 
                                                  handleFileSelect, 
                                                  false);
</script>

It adds an event listener to 'change', but I tested it and it triggers even if you choose the same file and not if you cancel.

Get text from DataGridView selected cells

the Best of both worlds.....

Private Sub tsbSendNewsLetter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tsbSendNewsLetter.Click
        Dim tmpstr As String = ""
        Dim cnt As Integer = 0
        Dim virgin As Boolean = True
        For cnt = 0 To (dgvDetails.Rows.Count - 1)
            If Not dgvContacts.Rows(cnt).Cells(9).Value.ToString() Is Nothing Then
                If Not dgvContacts.Rows(cnt).Cells(9).Value.ToString().Length = 0 Then
                    If Not virgin Then
                        tmpstr += ", "
                    End If
                    tmpstr += dgvContacts.Rows(cnt).Cells(9).Value.ToString()
                    virgin = False
                    'MsgBox(tmpstr)
                End If
            End If
        Next
        Dim email As New qkuantusMailer()
        email.txtMailTo.Text = tmpstr
        email.Show()
    End Sub

Array Length in Java

int array[]=new int[3]; array.length;

so here we have created an array with a memory space of 3... this is how it looks actually

0th 1st 2nd ...........> Index 2 4 5 ...........> Number

So as u see the size of this array is 3 but the index of array is only up to 2 since any array starts with 0th index.

second statement' output shall be 3 since the length of the array is 3... Please don't get confused between the index value and the length of the array....

cheers!

How can I make a clickable link in an NSAttributedString?

I just created a subclass of UILabel to specially address such use cases. You can add multiple links easily and define different handlers for them. It also supports highlighting the pressed link when you touch down for touch feedback. Please refer to https://github.com/null09264/FRHyperLabel.

In your case, the code may like this:

FRHyperLabel *label = [FRHyperLabel new];

NSString *string = @"This morph was generated with Face Dancer, Click to view in the app store.";
NSDictionary *attributes = @{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline]};

label.attributedText = [[NSAttributedString alloc]initWithString:string attributes:attributes];

[label setLinkForSubstring:@"Face Dancer" withLinkHandler:^(FRHyperLabel *label, NSString *substring){
    [[UIApplication sharedApplication] openURL:aURL];
}];

Sample Screenshot (the handler is set to pop an alert instead of open a url in this case)

facedancer

How does HTTP_USER_AGENT work?

The user agent string is a text that the browsers themselves send to the webserver to identify themselves, so that websites can send different content based on the browser or based on browser compatibility.

Mozilla is a browser rendering engine (the one at the core of Firefox) and the fact that Chrome and IE contain the string Mozilla/4 or /5 identifies them as being compatible with that rendering engine.

Get selected element's outer HTML

This is great for changing elements on the dom but does NOT work for ie when passing in a html string into jquery like this:

$('<div id="foo">Some <span id="blog">content</span></div>').find('#blog').outerHTML();

After some manipulation I have created a function which allows the above to work in ie for html strings:

$.fn.htmlStringOuterHTML = function() {     
    this.parent().find(this).wrap('<div/>');        
    return this.parent().html();
};

Substring a string from the end of the string

You can do:

string str = "Hello Marco !";
str = str.Substring(0, str.Length - 2);

Netbeans 8.0.2 The module has not been deployed

In my case I had installed a new version of netbeans and upgraded from java 7 to 8. The new netbeans had a different version of glassfish, so I opened the properties of my project and pointed it to the right glassfish version and set the jdk to version 8.

Calling C/C++ from Python?

I love cppyy, it makes it very easy to extend Python with C++ code, dramatically increasing performance when needed.

It is powerful and frankly very simple to use,

here it is an example of how you can create a numpy array and pass it to a class member function in C++.

cppyy_test.py

import cppyy
import numpy as np
cppyy.include('Buffer.h')


s = cppyy.gbl.Buffer()
numpy_array = np.empty(32000, np.float64)
s.get_numpy_array(numpy_array.data, numpy_array.size)
print(numpy_array[:20])

Buffer.h

struct Buffer {
  void get_numpy_array(double *ad, int size) {
    for( long i=0; i < size; i++)
        ad[i]=i;
  }
};

You can also create a Python module very easily (with CMake), this way you will avoid recompile the C++ code all the times.

Change directory command in Docker?

I was wondering if two times WORKDIR will work or not, but it worked :)

FROM ubuntu:18.04

RUN apt-get update && \
    apt-get install -y python3.6

WORKDIR /usr/src

COPY ./ ./

WORKDIR /usr/src/src

CMD ["python3", "app.py"]

Keep a line of text as a single line - wrap the whole line or none at all

You could also put non-breaking spaces ( ) in lieu of the spaces so that they're forced to stay together.

How do I wrap this line of text
-&nbsp;asked&nbsp;by&nbsp;Peter&nbsp;2&nbsp;days&nbsp;ago

iOS Launching Settings -> Restrictions URL Scheme

Solution for iOS10. Works fine.

NSURL *URL = [NSURL URLWithString:@"App-prefs:root=TWITTER"];
[[UIApplication sharedApplication] openURL:URL options:@{} completionHandler:nil];

How to know when a web page was last updated?

01. Open the page for which you want to get the information.

02. Clear the address bar [where you type the address of the sites]:

and type or copy/paste from below:

javascript:alert(document.lastModified)

03. Press Enter or Go button.

Java Byte Array to String to Byte Array

What Arrays.toString() does is create a string representation of each individual byte in your byteArray.

Please check the API documentation Arrays API

To convert your response string back to the original byte array, you have to use split(",") or something and convert it into a collection and then convert each individual item in there to a byte to recreate your byte array.

How do I append a node to an existing XML file in java

You could use DOM4j doing that.

Angular2 RC5: Can't bind to 'Property X' since it isn't a known property of 'Child Component'

If you use the Angular CLI to create your components, let's say CarComponent, it attaches app to the selector name (i.e app-car) and this throws the above error when you reference the component in the parent view. Therefore you either have to change the selector name in the parent view to let's say <app-car></app-car> or change the selector in the CarComponent to selector: 'car'

How can I correctly format currency using jquery?

As a corollary to why the jQuery FormatCurrency plugin is a good answer, I'd like to rebut your comment:

1. code.google.com/p/jquery-formatcurrency - Does not filter out all letter's. You can type a single letter and it will not remove it.

Yes, formatCurrency() by itself does not filter out letters:

// only formats currency
$(selector).formatCurrency();

But toNumber(), included in the formatCurrency plugin, does.

You thus want to do:

// removes invalid characters, then formats currency
$(selector).toNumber().formatCurrency();

Insert and set value with max()+1 problems

You can't do it in a single query, but you could do it within a transaction. Do the initial MAX() select and lock the table, then do the insert. The transaction ensures that nothing will interrupt the two queries, and the lock ensures that nothing else can try doing the same thing elsewhere at the same time.

Flatten List in LINQ

iList.SelectMany(x => x).ToArray()

Remove all elements contained in another array

I just implemented as:

Array.prototype.exclude = function(list){
        return this.filter(function(el){return list.indexOf(el)<0;})
}

Use as:

myArray.exclude(toRemove);

Could not load file or assembly 'xxx' or one of its dependencies. An attempt was made to load a program with an incorrect format

if while In visual studio with IIS express working and when published failed try this:

Why dividing two integers doesn't get a float?

Use casting of types:

int main() {
    int a;
    float b, c, d;
    a = 750;
    b = a / (float)350;
    c = 750;
    d = c / (float)350;
    printf("%.2f %.2f", b, d);
    // output: 2.14 2.14
}

This is another way to solve that:

 int main() {
        int a;
        float b, c, d;
        a = 750;
        b = a / 350.0; //if you use 'a / 350' here, 
                       //then it is a division of integers, 
                       //so the result will be an integer
        c = 750;
        d = c / 350;
        printf("%.2f %.2f", b, d);
        // output: 2.14 2.14
    }

However, in both cases you are telling the compiler that 350 is a float, and not an integer. Consequently, the result of the division will be a float, and not an integer.

C++ inheritance - inaccessible base?

By default, inheritance is private. You have to explicitly use public:

class Bar : public Foo

Website screenshots

I set up finally using microweber/screen as proposed by @boksiora.
Initially when trying the mentioned link here what I got:

Please download this script from here https://github.com/microweber/screen

I'm on Linux. So if you want to run it, you may adjust my step follow to your environment.
Here are the step I did on my shell on DOCUMENT_ROOT folder:

$ sudo wget https://github.com/microweber/screen/archive/master.zip
$ sudo unzip master.zip
$ sudo mv screen-master screen
$ sudo chmod +x screen/bin/phantomjs
$ sudo yum install fontconfig
$ sudo yum install freetype*
$ cd screen
$ sudo curl -sS https://getcomposer.org/installer | php
$ sudo php composer.phar update
$ cd ..
$ sudo chown -R apache screen
$ sudo chgrp -R www screen
$ sudo service httpd restart

Point your browser to screen/demo/shot.php?url=google.com. When you see the screenshot, you are done. Discussion for more advance setting is available here and here.

How do I get next month date from today's date and insert it in my database?

You do not actually need PHP functions to achieve this. You can already do simple date manipulations directly in SQL, for example:

$sql1 = "
    UPDATE `users` SET 
    `start_date` = CURDATE(), 
    `end_date` = DATE_ADD(CURDATE(), INTERVAL 1 MONTH)  
    WHERE `users`.`id` = '" . $id . "';
";

Refer to http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_addtime

Checking Bash exit status of several commands efficiently

run() {
  $*
  if [ $? -ne 0 ]
  then
    echo "$* failed with exit code $?"
    return 1
  else
    return 0
  fi
}

run command1 && run command2 && run command3

SQL Developer with JDK (64 bit) cannot find JVM

For Windows Users: If anyone downloaded a non-jre version and faced issue, then later trying with the JRE version and still facing the issue, you need to delete SQLDeveloper folder inside "%AppData%\sqldeveloper". After deleting try opening sqldeveloper.exe again.

log4j:WARN No appenders could be found for logger in web.xml

I had the same problem . Same configuration settings and same warning message . What worked for me was : Changing the order of the entries .

I put the entries for the log configuration [ the context param and the listener ] on the top of the file [ before the entry for the applicationContext.xml ] and it worked .

The Order matters , i guess .

Get User Selected Range

This depends on what you mean by "get the range of selection". If you mean getting the range address (like "A1:B1") then use the Address property of Selection object - as Michael stated Selection object is much like a Range object, so most properties and methods works on it.

Sub test()
    Dim myString As String
    myString = Selection.Address
End Sub

How to Animate Addition or Removal of Android ListView Rows

Have you considered animating a sweep to the right? You could do something like drawing a progressively larger white bar across the top of the list item, then removing it from the list. The other cells would still jerk into place, but it'd better than nothing.

Modifying a subset of rows in a pandas dataframe

Here is from pandas docs on advanced indexing:

The section will explain exactly what you need! Turns out df.loc (as .ix has been deprecated -- as many have pointed out below) can be used for cool slicing/dicing of a dataframe. And. It can also be used to set things.

df.loc[selection criteria, columns I want] = value

So Bren's answer is saying 'find me all the places where df.A == 0, select column B and set it to np.nan'

How can I find a specific file from a Linux terminal?

Solution: Use unix command find

The find utility recursively descends the directory tree for each path listed, evaluating an expression (composed of the 'primaries' and 'operands') in terms of each file in the tree.

You can make the find action be more efficient and smart by controlling it with regular expressions queries, file types, size thresholds, depths dimensions in subtree, groups, ownership, timestamps , modification/creation date and more.
In addition you can use operators and combine find requests such as or/not/and etc...

The Traditional Formula would be :

find <path> -flag <valueOfFlag>

Easy Examples

1.Find by Name - Find all package.json from my current location subtree hierarchy.

find . -name "package.json"

2.Find by Name and Type - find all node_modules directories from ALL file system (starting from root hierarchy )

sudo find / -name "node_modules" -type d

Complex Examples:

More Useful examples which can demonstrate the power of flag options and operators:

3.Regex and File Type - Find all javascript controllers variation names (using regex) javascript Files only in my app location.

find /user/dev/app -name "*contoller-*\.js" -type f

-type f means file -name related to regular expression to any variation of controller string and dash with .js at the end

4.Depth - Find all routes patterns directories in app directory no more than 3 dimensions ( app/../../.. only and no more deeper)

find app -name "*route*" -type d  -maxdepth 3

-type d means directory -name related to regular expression to any variation of route string -maxdepth making the finder focusing on 3 subtree depth and no more <yourSearchlocation>/depth1/depth2/depth3)

5.File Size , Ownership and OR Operator - Find all files with names 'sample' or 'test' under ownership of root user that greater than 1 Mega and less than 5 Mega.

find . \( -name "test" -or -name "sample" \)  -user root -size +1M -size -5M

-size threshold representing the range between more than (+) and less than (-) -user representing the file owner -or operator filters query for both regex matches

6.Empty Files - find all empty directories in file system

find / -type d -empty

7.Time Access, Modification and creation of files - find all files that were created/modified/access in directory in 10 days

# creation (c)
find /test -name "*.groovy" -ctime -10d
# modification (m)
find /test -name "*.java" -mtime -10d
# access (a)
find /test -name "*.js" -atime -10d

8.Modification Size Filter - find all files that were modified exactly between a week ago to 3 weeks ago and less than 500kb and present their sizes as a list

find /test -name "*.java" -mtime -3w -mtime +1w -size -500k | xargs du -h

Checking if an object is a number in C#

You will simply need to do a type check for each of the basic numeric types.

Here's an extension method that should do the job:

public static bool IsNumber(this object value)
{
    return value is sbyte
            || value is byte
            || value is short
            || value is ushort
            || value is int
            || value is uint
            || value is long
            || value is ulong
            || value is float
            || value is double
            || value is decimal;
}

This should cover all numeric types.

Update

It seems you do actually want to parse the number from a string during deserialisation. In this case, it would probably just be best to use double.TryParse.

string value = "123.3";
double num;
if (!double.TryParse(value, out num))
    throw new InvalidOperationException("Value is not a number.");

Of course, this wouldn't handle very large integers/long decimals, but if that is the case you just need to add additional calls to long.TryParse / decimal.TryParse / whatever else.

How can I style the border and title bar of a window in WPF?

You need to set

WindowStyle="None", AllowsTransparency="True" and optionally ResizeMode="NoResize"
and then set the Style property of the window to your custom window style, where you design the appearance of the window (title bar, buttons, border) to anything you want and display the window contents in a ContentPresenter.

This seems to be a good article on how you can achieve this, but there are many other articles on the internet.

Stacked bar chart

You will need to melt your dataframe to get it into the so-called long format:

require(reshape2)
sample.data.M <- melt(sample.data)

Now your field values are represented by their own rows and identified through the variable column. This can now be leveraged within the ggplot aesthetics:

require(ggplot2)
c <- ggplot(sample.data.M, aes(x = Rank, y = value, fill = variable))
c + geom_bar(stat = "identity")

Instead of stacking you may also be interested in showing multiple plots using facets:

c <- ggplot(sample.data.M, aes(x = Rank, y = value))
c + facet_wrap(~ variable) + geom_bar(stat = "identity")

Correct way to import lodash

import has from 'lodash/has'; is better because lodash holds all it's functions in a single file, so rather than import the whole 'lodash' library at 100k, it's better to just import lodash's has function which is maybe 2k.

Storing files in SQL Server

You might read up on FILESTREAM. Here is some info from the docs that should help you decide:

If the following conditions are true, you should consider using FILESTREAM:

Objects that are being stored are, on average, larger than 1 MB.

Fast read access is important.

You are developing applications that use a middle tier for application logic.

For smaller objects, storing varbinary(max) BLOBs in the database often provides better streaming performance.

How to use vertical align in bootstrap

http://jsfiddle.net/b9chris/zN39r/

HTML:

<div class="item row">
    <div class="col-xs-12 col-sm-6"><h4>This is some text.</h4></div>
    <div class="col-xs-12 col-sm-6"><h4>This is some more.</h4></div>
</div>

CSS:

div.item div h4 {
    height: 60px;
    vertical-align: middle;    
    display: table-cell;
}

Important notes:

The vertical-align: middle; display: table-cell; must be applied to a tag that has no Bootstrap classes applied; it cannot be a col-*, a row, etc.
This can't be done without this extra, possibly pointless tag in your HTML, unfortunately.
The backgrounds are unnecessary - they're just there for demo purposes. So, you don't need to apply any special rules to the row or col-* tags.
It is important to notice the inner tag does not stretch to 100% of the width of its parent; in our scenario this didn't matter but it may to you. If it does, you end up with something closer to some of the other answers here:

http://jsfiddle.net/b9chris/zN39r/1/

CSS:

div.item div {
    background: #fdd;
    table-layout: fixed;
    display: table;
}
div.item div h4 {
    height: 60px;
    vertical-align: middle;    
    display: table-cell;
    background: #eee;
}

Notice the added table-layout and display properties on the col-* tags. This must be applied to the tag(s) that have col-* applied; it won't help on other tags.

How to find keys of a hash?

I wanted to use the top rated answer above

Object.prototype.keys = function () ...

However when using in conjunction with the google maps API v3, google maps is non-functional.

for (var key in h) ...

works well.

How to pass arguments to entrypoint in docker-compose.yml

The command clause does work as @Karthik says above.

As a simple example, the following service will have a -inMemory added to its ENTRYPOINT when docker-compose up is run.

version: '2'
services:
  local-dynamo:
    build: local-dynamo
    image: spud/dynamo
    command: -inMemory

To find first N prime numbers in python

Whilst playing with prime numbers in Python V3 I noticed that the smallest number by which a composite(non-prime) number is divisible is itself always a prime that is less than the square root of the number under test.

Below is my implementation of that finding to calculate the first N prime numbers.

first 1,000 primes in 0.028S | first 10,000 primes in 0.6S | first 100,000 primes in 14.3S

The snippet below also indicates how long the generation took and prints out the primes in a nice table format.

import time
import math

def first_n_Primes(n):
    number_under_test = 4
    primes = [2,3]
    while len(primes) < n:
        check = False
        for prime in primes:
            if prime > math.sqrt(number_under_test) : break
            if number_under_test % prime == 0:
                check = True
                break
        if not check:
            for counter in range(primes[len(primes)-1],number_under_test-1,2):
                if number_under_test % counter == 0:
                    check = True
                    break
        if not check:
            primes.append(number_under_test)
        number_under_test+=1
    return primes

start_time = time.time()
data = first_n_Primes(1000)
end_time = time.time()

i = 1
while i < len(data)+1:
    print('{0: <9}'.format(str(data[i-1])), end="")
    if i%10 == 0: print("")
    i+=1

print("\nFirst %d primes took %s seconds ---" % (len(data),end_time - start_time))

How to save image in database using C#

You'll need to serialize the image to a binary format that can be stored in a SQL BLOB column. Assuming you're using SQL Server, here is a good article on the subject:

http://www.eggheadcafe.com/articles/20020929.asp

How to form tuple column from two columns in Pandas

Get comfortable with zip. It comes in handy when dealing with column data.

df['new_col'] = list(zip(df.lat, df.long))

It's less complicated and faster than using apply or map. Something like np.dstack is twice as fast as zip, but wouldn't give you tuples.

Concatenating variables and strings in React

the best way to concat props/variables:

var sample = "test";    
var result = `this is just a ${sample}`;    
//this is just a test

List of All Locales and Their Short Codes?

Here's a pretty exhaustive list of Culture Codes. As far as I can tell, they don't vary between programming languages since it's an RFC standard. As for English, I think if you support either the generic en or possibly the en-US then you should be just fine.

Event on a disabled input

Instead of disabled, you could consider using readonly. With some extra CSS you can style the input so it looks like an disabled field.

There is actually another problem. The event change only triggers when the element looses focus, which is not logic considering an disabled field. Probably you are pushing data into this field from another call. To make this work you can use the event 'bind'.

$('form').bind('change', 'input', function () {
    console.log('Do your thing.');
});

Convert List<T> to ObservableCollection<T> in WP7

Apparently, your project is targeting Windows Phone 7.0. Unfortunately the constructors that accept IEnumerable<T> or List<T> are not available in WP 7.0, only the parameterless constructor. The other constructors are available in Silverlight 4 and above and WP 7.1 and above, just not in WP 7.0.

I guess your only option is to take your list and add the items into a new instance of an ObservableCollection individually as there are no readily available methods to add them in bulk. Though that's not to stop you from putting this into an extension or static method yourself.

var list = new List<SomeType> { /* ... */ };
var oc = new ObservableCollection<SomeType>();
foreach (var item in list)
    oc.Add(item);

But don't do this if you don't have to, if you're targeting framework that provides the overloads, then use them.

MySQL SELECT WHERE datetime matches day (and not necessarily time)

NEVER EVER use a selector like DATE(datecolumns) = '2012-12-24' - it is a performance killer:

it will calculate DATE() for all rows, including those, that don't match
it will make it impossible to use an index for the query

It is much faster to use

SELECT * FROM tablename 
WHERE columname BETWEEN '2012-12-25 00:00:00' AND '2012-12-25 23:59:59'

as this will allow index use without calculation.

EDIT

As pointed out by Used_By_Already, in the time since the inital answer in 2012, there have emerged versions of MySQL, where using '23:59:59' as a day end is no longer safe. An updated version should read

SELECT * FROM tablename 
WHERE columname >='2012-12-25 00:00:00'
AND columname <'2012-12-26 00:00:00'

The gist of the answer, i.e. the avoidance of a selector on a calculated expression, of course still stands.

MySQL IF NOT NULL, then display 1, else display 0

How to clear variables in ipython?

In iPython you can remove a single variable like this:

del x

Programs & Examples On #Ppi

I am receiving warning in Facebook Application using PHP SDK

Zipping a file in bash fails

How is VIP swapping + CNAMEs better than IP swapping + A records?

Is it possible to execute multiple _addItem calls asynchronously using Google Analytics?

What's the net::ERR_HTTP2_PROTOCOL_ERROR about?

Angular @ViewChild() error: Expected 2 arguments, but got 1

Angular 8

Angular 9 & Angular 10

Access blocked by CORS policy: Response to preflight request doesn't pass access control check

Android Gradle 5.0 Update:Cause: org.jetbrains.plugins.gradle.tooling.util

ping: google.com: Temporary failure in name resolution

Flutter: RenderBox was not laid out

Flutter - The method was called on null

Flutter- wrapping text

How to format DateTime in Flutter , How to get current time in flutter?

Xcode couldn't find any provisioning profiles matching

Connection Java-MySql : Public Key Retrieval is not allowed

Dart: mapping a list (list.map)

Not able to install Python packages [SSL: TLSV1_ALERT_PROTOCOL_VERSION]

What could cause an error related to npm not being able to find a file? No contents in my node_modules subfolder. Why is that?

Spring Data JPA findOne() change to Optional how to use this?

After Spring Boot 2.0 migration: jdbcUrl is required with driverClassName

How do I deal with installing peer dependencies in Angular CLI?

Numpy Resize/Rescale Image

forEach() in React JSX does not output any HTML

java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex in Android Studio 3.0

How to solve npm install throwing fsevents warning on non-MAC OS?

Codesign wants to access key "access" in your keychain, I put in my login password but keeps asking me

How do I use Safe Area Layout programmatically?

git clone error: RPC failed; curl 56 OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 10054

No converter found capable of converting from type to type

JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value

Spring Boot 2.2.2 / Gradle:

CSS Grid Layout not working in IE11 even with prefixes

repeat()

span

grid-gap

grid item auto placement

No String-argument constructor/factory method to deserialize from String value ('')

Returning JSON object as response in Spring Boot

Kubernetes Pod fails with CrashLoopBackOff

Vue Js - Loop via v-for X times (in a range)

How to convert JSON string into List of Java object?

RestClientException: Could not extract response. no suitable HttpMessageConverter found

Jersey stopped working with InjectionManagerFactory not found

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

How to change the application launcher icon on Flutter?

Docker "ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network"

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists. on deploying to tomcat

How to use paths in tsconfig.json?

CSS grid wrapping

Field 'browser' doesn't contain a valid alias configuration

'Field required a bean of type that could not be found.' error spring restful API using mongodb

Unsupported Media Type in postman

Wrapping a react-router Link in an html button

How can I serve static html from spring boot?

Chrome violation : [Violation] Handler took 83ms of runtime

Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens

MultipartException: Current request is not a multipart request

How to parse JSON in Kotlin?

Consider defining a bean of type 'service' in your configuration [Spring boot]

My kubernetes pods keep crashing with "CrashLoopBackOff" but I can't find any log

UnsatisfiedDependencyException: Error creating bean with name

How to decrease prod bundle size?

How to upgrade Angular CLI project?

"ssl module in Python is not available" when installing package with pip3

Rebuild Docker container on file changes

PHP error: "The zip extension and unzip command are both missing, skipping."

currently unable to handle this request HTTP ERROR 500

Tomcat 8 is not able to handle get request with '|' in query parameters?

Spring security CORS Filter

Consider defining a bean of type 'package' in your configuration [Spring-Boot]

Deserialize Java 8 LocalDateTime with JacksonMapper

npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]

How to do tag wrapping in VS code?

How to import a CSS file in a React Component

gzip: stdin: not in gzip format tar: Child returned status 1 tar: Error is not recoverable: exiting now

Elasticsearch : Root mapping definition has unsupported parameters index : not_analyzed

Docker-Compose persistent data MySQL

`repeat()`

`span`

`grid-gap`