Programs & Examples On #Renice

How do I generate sourcemaps when using babel and webpack?

Even same issue I faced, in browser it was showing compiled code. I have made below changes in webpack config file and it is working fine now.

 devtool: '#inline-source-map',
 debug: true,

and in loaders I kept babel-loader as first option

loaders: [
    loader: "babel-loader",
    include: [path.resolve(__dirname, "src")]
  { test: /\.js$/, exclude: [/app\/lib/, /node_modules/], loader: 'ng-annotate!babel' },
  { test: /\.html$/, loader: 'raw' },
    test: /\.(jpe?g|png|gif|svg)$/i,
    loaders: [
  {test: /\.less$/, loader: "style!css!less"},
  { test: /\.styl$/, loader: 'style!css!stylus' },
  { test: /\.css$/, loader: 'style!css' }

What is log4j's default log file dumping path

By default, Log4j logs to standard output and that means you should be able to see log messages on your Eclipse's console view. To log to a file you need to use a FileAppender explicitly by defining it in a file in your classpath.

Create the following file in your classpath. This allows you to log your message to both a file as well as your console.

log4j.rootLogger=debug, stdout, file


# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.file.layout.ConversionPattern=%p %t %c - %m%n

Note: The above creates an example.log in your current working directory (i.e. Eclipse's project directory) so that the same could work with different projects without overwriting each other's logs.

Apache log4j 1.2 - Short introduction to log4j

Where can I find a list of escape characters required for my JSON ajax return type?

Take a look at It claims a bit different list of escaped characters than Chris proposed.

\u four-hex-digits

How do I update zsh to the latest version?

As far as I'm aware, you've got three options to install zsh on Mac OS X:

  • Pre-built binary. The only one I know of is the one that ships with OS X; this is probably what you're running now.
  • Use a package system (Ports, Homebrew).
  • Install from source. Last time I did this it wasn't too difficult (./configure, make, make install).

How to migrate GIT repository from one server to a new one

Updated to use git push --mirror origin instead of git push -f origin as suggested in the comments.

This worked for me flawlessly.

git clone --mirror <URL to my OLD repo location>
cd <New directory where your OLD repo was cloned>
git remote set-url origin <URL to my NEW repo location>
git push --mirror origin

I have to mention though that this creates a mirror of your current repo and then pushes that to the new location. Therefore, this can take some time for large repos or slow connections.

Object comparison in JavaScript

Here is my version, pretty much stuff from this thread is integrated (same counts for the test cases):

Object.defineProperty(Object.prototype, "equals", {
    enumerable: false,
    value: function (obj) {
        var p;
        if (this === obj) {
            return true;

        // some checks for native types first

        // function and sring
        if (typeof(this) === "function" || typeof(this) === "string" || this instanceof String) { 
            return this.toString() === obj.toString();

        // number
        if (this instanceof Number || typeof(this) === "number") {
            if (obj instanceof Number || typeof(obj) === "number") {
                return this.valueOf() === obj.valueOf();
            return false;

        // null.equals(null) and undefined.equals(undefined) do not inherit from the 
        // Object.prototype so we can return false when they are passed as obj
        if (typeof(this) !== typeof(obj) || obj === null || typeof(obj) === "undefined") {
            return false;

        function sort (o) {
            var result = {};

            if (typeof o !== "object") {
                return o;

            Object.keys(o).sort().forEach(function (key) {
                result[key] = sort(o[key]);

            return result;

        if (typeof(this) === "object") {
            if (Array.isArray(this)) { // check on arrays
                return JSON.stringify(this) === JSON.stringify(obj);                
            } else { // anyway objects
                for (p in this) {
                    if (typeof(this[p]) !== typeof(obj[p])) {
                        return false;
                    if ((this[p] === null) !== (obj[p] === null)) {
                        return false;
                    switch (typeof(this[p])) {
                    case 'undefined':
                        if (typeof(obj[p]) !== 'undefined') {
                            return false;
                    case 'object':
                        if (this[p] !== null 
                                && obj[p] !== null 
                                && (this[p].constructor.toString() !== obj[p].constructor.toString() 
                                        || !this[p].equals(obj[p]))) {
                            return false;
                    case 'function':
                        if (this[p].toString() !== obj[p].toString()) {
                            return false;
                        if (this[p] !== obj[p]) {
                            return false;


        // at least check them with JSON
        return JSON.stringify(sort(this)) === JSON.stringify(sort(obj));

Here is my TestCase:


    assertTrue("String", "hi".equals("hi"));
    assertTrue("Number", new Number(5).equals(5));
    assertFalse("Number", new Number(5).equals(10));
    assertFalse("Number+String", new Number(1).equals("1"));


    assertTrue(new Date("2011-03-31").equals(new Date("2011-03-31")));
    assertFalse(new Date("2011-03-31").equals(new Date("1970-01-01")));


    assertTrue({1:{name:"mhc",age:28}, 2:{name:"arb",age:26}}.equals({1:{name:"mhc",age:28}, 2:{name:"arb",age:26}}));
    assertFalse({1:{name:"mhc",age:28}, 2:{name:"arb",age:26}}.equals({1:{name:"mhc",age:28}, 2:{name:"arb",age:27}}));

    assertTrue("Function", (function(x){return x;}).equals(function(x){return x;}));
    assertFalse("Function", (function(x){return x;}).equals(function(y){return y+2;}));

    var a = {a: 'text', b:[0,1]};
    var b = {a: 'text', b:[0,1]};
    var c = {a: 'text', b: 0};
    var d = {a: 'text', b: false};
    var e = {a: 'text', b:[1,0]};
    var f = {a: 'text', b:[1,0], f: function(){ this.f = this.b; }};
    var g = {a: 'text', b:[1,0], f: function(){ this.f = this.b; }};
    var h = {a: 'text', b:[1,0], f: function(){ this.a = this.b; }};
    var i = {
        a: 'text',
        c: {
            b: [1, 0],
            f: function(){
                this.a = this.b;
    var j = {
        a: 'text',
        c: {
            b: [1, 0],
            f: function(){
                this.a = this.b;
    var k = {a: 'text', b: null};
    var l = {a: 'text', b: undefined};


Filter object properties by key in ES6

During loop, return nothing when certain properties/keys are encountered and continue with the rest:

const loop = product =>
Object.keys(product).map(key => {
    if (key === "_id" || key === "__v") {
    return (
        <ul className="list-group">

The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception

in my case adding <clear /> just after <connectionStrings> worked like charm

Refused to load the script because it violates the following Content Security Policy directive

Adding the meta tag to ignore this policy was not helping us, because our webserver was injecting the Content-Security-Policy header in the response.

In our case we are using Ngnix as the web server for a Tomcat 9 Java-based application. From the web server, it is directing the browser not to allow inline scripts, so for a temporary testing we have turned off Content-Security-Policy by commenting.

How to turn it off in ngnix

  • By default, ngnix ssl.conf file will have this adding a header to the response:

    #> grep 'Content-Security' -ir /etc/nginx/global/ssl.conf add_header Content-Security-Policy "default-src 'none'; frame-ancestors 'none'; script-src 'self'; img-src 'self'; style-src 'self'; base-uri 'self'; form-action 'self';";

  • If you just comment this line and restart ngnix, it should not be adding the header to the response.

If you are concerned about security or in production please do not follow this, use these steps as only for testing purpose and moving on.

How To have Dynamic SQL in MySQL Stored Procedure

You can pass thru outside the dynamic statement using User-Defined Variables

Server version: 5.6.25-log MySQL Community Server (GPL)

mysql> PREPARE stmt FROM 'select "AAAA" into @a';
Query OK, 0 rows affected (0.01 sec)
Statement prepared

mysql> EXECUTE stmt;
Query OK, 1 row affected (0.01 sec)

DEALLOCATE prepare stmt;
Query OK, 0 rows affected (0.01 sec)

mysql> select @a;
| @a   |
|AAAA  |
1 row in set (0.01 sec)

Import cycle not allowed

I just encountered this. You may be accessing a method/type from within the same package using the package name itself.

Here is an example to illustrate what I mean:

In foo.go:

// foo.go
package foo

func Foo() {...}

In foo_test.go:

// foo_test.go
package foo

// try to access Foo()
foo.Foo() // WRONG <== This was the issue. You are already in package foo, there is no need to use foo.Foo() to access Foo()
Foo() // CORRECT

Cache busting via params

Found a comparison of the 2 techniques (query string vs file name) here:

Version as a querystring has two problems.

First, it may not always be a browser that implements caching through which we need to bust. It is said that certain (possibly older) proxies do ignore the querystring with respect to their caching behavior.

Second, in certain more complex deployment scenarios, where you have multiple frontend and/or multiple backend servers, an upgrade is anything but instantaneous. You need to be able to serve both the old and the new version of your assets at the same time. See for example how this affects you when using Google App Engine.

What is the difference between association, aggregation and composition?

Composition: is a "part-of" relationship.

for example “engine is part of the car”, “heart is part of the body”.

enter image description here

Association: is a “has-a” type relationship

For example, suppose we have two classes then these two classes are said to be “has-a” relationships if both of these entities share each other’s object for some work and at the same time they can exist without each other's dependency or both have their own lifetime.

enter image description here

The above example showing an association relationship because of both Employee and Manager class using the object of each other and both their own independent life cycle.

Aggregation: is based is on "has-a" relationship and it's is \\a special form of association

for example, “Student” and “address”. Each student must have an address so the relationship between Student class and Address class will be “Has-A” type relationship but vice versa is not true.

enter image description here

How to fix: "HAX is not working and emulator runs in emulation mode"

Either increase the ram size allocated while doing HAX installation , so as to fit exactly or a bit more higher space than the ram size of the emulator which you want to launch in "Intel x86 Emulator Accelerator (HAXM) " mode,

Once you succeed with that, you can now able to view this in the console /log

enter image description here

Is JavaScript's "new" keyword considered harmful?

I am newbie to Javascript so maybe I am just not too experienced in providing a good view point to this. Yet I want to share my view on this "new" thing.

I have come from the C# world where using the keyword "new" is so natural that it is the factory design pattern that looks weird to me.

When I first code in Javascript, I don't realize that there is the "new" keyword and code like the one in YUI pattern and it doesn't take me long to run into disaster. I lose track of what a particular line is supposed to be doing when looking back the code I've written. More chaotic is that my mind can't really transit between object instances boundaries when I am "dry-running" the code.

Then, I found the "new" keyword which to me, it "separate" things. With the new keyword, it creates things. Without the new keyword, I know I won't confuse it with creating things unless the function I am invoking gives me strong clues of that.

For instance, with var bar=foo(); I have no clues as what bar could possibly be.... Is it a return value or is it a newly created object? But with var bar = new foo(); I know for sure bar is an object.

How to configure ChromeDriver to initiate Chrome browser in Headless mode through Selenium?

Update August 20, 2020 -- Now is simple!

from import WebDriverWait

chrome_options = webdriver.ChromeOptions()
chrome_options.headless = True

self.driver = webdriver.Chrome(
            executable_path=DRIVER_PATH, chrome_options=chrome_options)

Embedding DLLs in a compiled executable

I highly recommend to use Costura.Fody - by far the best and easiest way to embed resources in your assembly. It's available as NuGet package.

Install-Package Costura.Fody

After adding it to the project, it will automatically embed all references that are copied to the output directory into your main assembly. You might want to clean the embedded files by adding a target to your project:


You'll also be able to specify whether to include the pdb's, exclude certain assemblies, or extracting the assemblies on the fly. As far as I know, also unmanaged assemblies are supported.


Currently, some people are trying to add support for DNX.

Update 2

For the lastest Fody version, you will need to have MSBuild 16 (so Visual Studio 2019). Fody version 4.2.1 will do MSBuild 15. (reference: Fody is only supported on MSBuild 16 and above. Current version: 15)

"for loop" with two variables?

for (i,j) in [(i,j) for i in range(x) for j in range(y)]

should do it.

Allow scroll but hide scrollbar

I know this is an oldie but here is a quick way to hide the scroll bar with pure CSS.

Just add

::-webkit-scrollbar {display:none;}

To your id or class of the div you're using the scroll bar with.

Here is a helpful link Custom Scroll Bar in Webkit

Android ViewPager with bottom dots

Following is my proposed solution.

  • Since we need to show only some images in the view pagers so have avoided the cumbersome use of fragments.
    • Implemented the view page indicators (the bottom dots without any extra library or plugin)
    • On the touch of the view page indicators(the dots) also the page navigation is happening.
    • Please don"t forget to add your own images in the resources.
    • Feel free to comment and improve upon it.

A) Following is my activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android=""

    < xmlns:android=""
        android:layout_height="wrap_content" />


            android:orientation="horizontal" />



B) pager_item.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android=""
    android:orientation="vertical" android:layout_width="match_parent"

        android:id="@+id/imageView" />


import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener, View.OnClickListener {

    int[] mResources = {R.drawable.nature1, R.drawable.nature2, R.drawable.nature3, R.drawable.nature4,
            R.drawable.nature5, R.drawable.nature6

    ViewPager mViewPager;
    private CustomPagerAdapter mAdapter;
    private LinearLayout pager_indicator;
    private int dotsCount;
    private ImageView[] dots;

    protected void onCreate(Bundle savedInstanceState) {

        mViewPager = (ViewPager) findViewById(;
        pager_indicator = (LinearLayout) findViewById(;
        mAdapter = new CustomPagerAdapter(this, mResources);



    private void setPageViewIndicator() {

        Log.d("###setPageViewIndicator", " : called");
        dotsCount = mAdapter.getCount();
        dots = new ImageView[dotsCount];

        for (int i = 0; i < dotsCount; i++) {
            dots[i] = new ImageView(this);

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(

            params.setMargins(4, 0, 4, 0);

            final int presentPosition = i;
            dots[presentPosition].setOnTouchListener(new View.OnTouchListener() {

                public boolean onTouch(View v, MotionEvent event) {
                    return true;


            pager_indicator.addView(dots[i], params);


    public void onClick(View v) {


    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {


    public void onPageSelected(int position) {

        Log.d("###onPageSelected, pos ", String.valueOf(position));
        for (int i = 0; i < dotsCount; i++) {


        if (position + 1 == dotsCount) {

        } else {


    public void onPageScrollStateChanged(int state) {



 import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.LinearLayout;

    public class CustomPagerAdapter extends PagerAdapter {
        private Context mContext;
        LayoutInflater mLayoutInflater;
        private int[] mResources;

        public CustomPagerAdapter(Context context, int[] resources) {
            mContext = context;
            mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mResources = resources;

        public Object instantiateItem(ViewGroup container, int position) {

            View itemView = mLayoutInflater.inflate(R.layout.pager_item,container,false);
            ImageView imageView = (ImageView) itemView.findViewById(;
           /* LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(950, 950);
            return itemView;

        public void destroyItem(ViewGroup collection, int position, Object view) {
            collection.removeView((View) view);

        public int getCount() {
            return mResources.length;

        public boolean isViewFromObject(View view, Object object) {
            return view == object;

E) selecteditem_dot.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android=""
    android:shape="oval" android:useLevel="true"

    <size android:height="12dip" android:width="12dip"/>

    <solid android:color="#7e7e7e"/>

F) nonselecteditem_dot.xml

 <?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android=""
        android:shape="oval" android:useLevel="true"
        <size android:height="12dip" android:width="12dip"/>        
        <solid android:color="#d3d3d3"/>

first image

enter image description here

TensorFlow, "'module' object has no attribute 'placeholder'"

Faced same issue on Ubuntu 16LTS when tensor flow was installed over existing python installation.

Workaround: 1.)Uninstall tensorflow from pip and pip3

sudo pip uninstall tensorflow
sudo pip3 uninstall tensorflow

2.)Uninstall python & python3

sudo apt-get remove python-dev python3-dev python-pip python3-pip

3.)Install only a single version of python(I used python 3)

sudo apt-get install python3-dev python3-pip

4.)Install tensorflow to python3

sudo pip3 install --upgrade pip

for non GPU tensorflow, run this command

sudo pip3 install --upgrade tensorflow

for GPU tensorflow, run below command

sudo pip3 install --upgrade tensorflow-gpu

Suggest not to install GPU and vanilla version of tensorflow

In what cases will HTTP_REFERER be empty

HTTP_REFERER - sent by the browser, stating the last page the browser viewed!

If you trusting [HTTP_REFERER] for any reason that is important, you should not, since it can be faked easily:

  1. Some browsers limit access to not allow HTTP_REFERER to be passed
  2. Type a address in the address bar will not pass the HTTP_REFERER
  3. open a new browser window will not pass the HTTP_REFERER, because HTTP_REFERER = NULL
  4. has some browser addon that blocks it for privacy reasons. Some firewalls and AVs do to.

Try this firefox extension, you'll be able to set any headers you want:

@Master of Celebration:


extensions: refspoof, refontrol, modify headers, no-referer

Completely disable: the option is available in about:config under "network.http.sendRefererHeader" and you want to set this to 0 to disable referer passing.

Google chrome / Chromium:

extensions: noref, spoofy, external noreferrer

Completely disable: Chnage ~/.config/google-chrome/Default/Preferences or ~/.config/chromium/Default/Preferences and set this:

   "enable_referrers": false,

Or simply add --no-referrers to shortcut or in cli:

google-chrome --no-referrers


Completely disable: Settings > Preferences > Advanced > Network, and uncheck "Send referrer information"

Spoofing web service:

Standalone filtering proxy (spoof any header):


Spoofing http_referer when using wget


Spoofing http_referer when using curl

-e, --referer

Spoofing http_referer wth telnet

telnet 80 (press return)
GET /index.html HTTP/1.0 (press return)
Referer: (press return)
(press return again)

How can I slice an ArrayList out of an ArrayList in Java?

I have found a way if you know startIndex and endIndex of the elements one need to remove from ArrayList

Let al be the original ArrayList and startIndex,endIndex be start and end index to be removed from the array respectively:

al.subList(startIndex, endIndex + 1).clear();

Why should I use an IDE?

Simply put, an IDE offers additional time-saving features over a simple editor.

How can I cast int to enum?

The following is a slightly better extension method:

public static string ToEnumString<TEnum>(this int enumValue)
    var enumString = enumValue.ToString();
    if (Enum.IsDefined(typeof(TEnum), enumValue))
        enumString = ((TEnum) Enum.ToObject(typeof (TEnum), enumValue)).ToString();
    return enumString;

PostgreSQL error: Fatal: role "username" does not exist

After trying many other people's solutions, and without success, this answer finally helped me.

In short, running

sudo -u postgres createuser owning_user

creates a role with name owning_user (in this case, h9uest). After that you can run rake db:create from the terminal under whatever account name you set up without having to enter into the Postgres environment.

How to use comparison and ' if not' in python?

In this particular case the clearest solution is the S.Lott answer

But in some complex logical conditions I would prefer use some boolean algebra to get a clear solution.

Using De Morgan's law ¬(A^B) = ¬Av¬B

not (u0 <= u and u < u0+step)
(not u0 <= u) or (not u < u0+step)
u0 > u or u >= u0+step


if u0 > u or u >= u0+step:

... in this case the «clear» solution is not more clear :P

Show only two digit after decimal

Here i will demonstrate you that how to make your decimal number short. Here i am going to make it short upto 4 value after decimal.

  double value = 12.3457652133
  value =Double.parseDouble(new DecimalFormat("##.####").format(value));

ASP.NET MVC JsonResult Date Format

Annoying, isn't it ?

My solution was to change my WCF service to get it to return DateTimes in a more readable (non-Microsoft) format. Notice below, the "UpdateDateOriginal", which is WCF's default format of dates, and my "UpdateDate", which is formatted to something more readable.

enter image description here

Here's how to do it:

Changing WCF date format

Hope this helps.

search in java ArrayList

Personally I rarely write loops myself now when I can get away with it... I use the Jakarta commons libs:

Customer findCustomerByid(final int id){
    return (Customer) CollectionUtils.find(customers, new Predicate() {
        public boolean evaluate(Object arg0) {
            return ((Customer) arg0).getId()==id;

Yay! I saved one line!

Leave out quotes when copying from cell

It's also possible to remove these double-quotes by placing your result on the "Clean" function.



The output will be pasted without the double-quotes on other programs such as Notepad++.

Sorting objects by property values

I have wrote this simple function for myself:

function sortObj(list, key) {
    function compare(a, b) {
        a = a[key];
        b = b[key];
        var type = (typeof(a) === 'string' ||
                    typeof(b) === 'string') ? 'string' : 'number';
        var result;
        if (type === 'string') result = a.localeCompare(b);
        else result = a - b;
        return result;
    return list.sort(compare);

for example you have list of cars:

var cars= [{brand: 'audi', speed: 240}, {brand: 'fiat', speed: 190}];
var carsSortedByBrand = sortObj(cars, 'brand');
var carsSortedBySpeed = sortObj(cars, 'speed');

Get first and last day of month using threeten, LocalDate

The API was designed to support a solution that matches closely to business requirements

import static java.time.temporal.TemporalAdjusters.*;

LocalDate initial = LocalDate.of(2014, 2, 13);
LocalDate start = initial.with(firstDayOfMonth());
LocalDate end = initial.with(lastDayOfMonth());

However, Jon's solutions are also fine.

Possible to change where Android Virtual Devices are saved?

Modify the file "virtual_android2.2.ini" in "C:\Documents and Settings{your windows login}.android\avd\":


And move the folder "virtual_android2.2.avd" from "C:\Documents and Settings{your windows login}.android\avd\" into "E:\android_workspace\avd\".

Create view with primary key?

I got the error "The table/view 'dbo.vMyView' does not have a primary key defined" after I created a view in SQL server query designer. I solved the problem by using ISNULL on a column to force entity framework to use it as a primary key. You might have to restart visual studio to get the warnings to go away.

CREATE VIEW [dbo].[vMyView]
SELECT ISNULL(Id, -1) AS IdPrimaryKey, Name
FROM  dbo.MyTable

add image to uitableview cell

Try this code:--

UIImageView *imv = [[UIImageView alloc]initWithFrame:CGRectMake(3,2, 20, 25)];
imv.image=[UIImage imageNamed:@"arrow2.png"];
[cell addSubview:imv];
[imv release];

When and why do I need to use cin.ignore() in C++?

It is better to use scanf(" %[^\n]",str) in c++ than cin.ignore() after cin>> statement.To do that first you have to include < cstdio > header.

How do I clone a single branch in Git?

Let us take the example of flask repo. It has 3 branches in addition to master. Let us checkout the 1.1.x remote branch

clone the git repo

git clone

cd into the repo.

cd flask

fetch remote branch 1.1.x

git fetch origin 1.1.x

checkout the branch

git checkout 1.1.x

You will switch to the branch 1.1.x and it will track the remote 1.1.x branch.

How to select data of a table from another database in SQL Server?

To do a cross server query, check out the system stored procedure: sp_addlinkedserver in the help files.

Once the server is linked you can run a query against it.

Open links in new window using AngularJS

@m59 Directives will work for ng-bind-html you just need to wait for $viewContentLoaded to finish

app.directive('targetBlank', function($timeout) {
  return function($scope, element) {
    $scope.initializeTarget = function() {
      return $scope.$on('$viewContentLoaded', $timeout(function() {
        var elems;
        elems = element.prop('tagName') === 'A' ? element : element.find('a');
        elems.attr('target', '_blank');
    return $scope.initializeTarget();


What causes the error "undefined reference to (some function)"?

It's a linker error. ld is the linker, so if you get an error message ending with "ld returned 1 exit status", that tells you that it's a linker error.

The error message tells you that none of the object files you're linking against contains a definition for avergecolumns. The reason for that is that the function you've defined is called averagecolumns (in other words: you misspelled the function name when calling the function (and presumably in the header file as well - otherwise you'd have gotten a different error at compile time)).

How do I increase the capacity of the Eclipse output console?

Eclipse has limit of 32000 characters per line. If you have, for example JSONObject, which you want to log into console, you won't succeed. You can't handle this with the checkbox. Tested

Click a button programmatically - JS

I have never developed with HangOut. I ran into the same problems with FB-login and I was trying so hard to get it to click programatically. Then later I discovered that the sdk won't allow you to programatically click the button because of some security reasons. The user has to physically click on the button. This also happens with async asp fileupload button. So please check if HangOut does allow you to programatically click a buttton. All above codes are correct and they should work. If you dig deep enough you will see that my answer is the right answer for your situation you.

MySQL Data Source not appearing in Visual Studio

The Connector 6.7.x does not integrate the native data provider anymore. For "Visual Studio 2012" or less, you have to install "MySQL for Visual Studio". If you are using "Visual Studio 2013" there is no possibility to integrate MySQL for the "Entity Framework" yet. A solution should be available on 10/2013!

How to center align the cells of a UICollectionView?

I think you can achieve the single line look by implementing something like this:

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(0, 100, 0, 0);

You will have to play around with that number to figure out how to force the content into a single line. The first 0, is the top edge argument, you could adjust that one too, if you want to center the content vertically in the screen.

How should I remove all the leading spaces from a string? - swift

Swift 3 version

  //This function trim only white space:
   func trim() -> String
            return self.trimmingCharacters(in: CharacterSet.whitespaces)
    //This function trim whitespeaces and new line that you enter:
     func trimWhiteSpaceAndNewLine() -> String
            return self.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

How to add to the end of lines containing a pattern with sed or awk?

Here is another simple solution using sed.

$ sed -i 's/all.*/& anotherthing/g' filename.txt


all.* means all lines started with 'all'.

& represent the match (ie the complete line that starts with 'all')

then sed replace the former with the later and appends the ' anotherthing' word

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

This error occurs when you have a Google Services Json file downloaded in your project whose Package name doesn't match with your Project's package name.

Recently renamed the project's package name?

It does update all the classes but not the Gradle File. So check if your package name is correct in your Gradle, and also maybe Manifest too.

How to access the value of a promise?

.then function of promiseB receives what is returned from .then function of promiseA.

here promiseA is returning is a number, which will be available as number parameter in success function of promiseB. which will then be incremented by 1

How to store a byte array in Javascript

var array = new Uint8Array(100);    
array[10] = 256;
array[10] === 0 // true

I verified in firefox and chrome, its really an array of bytes :

var array = new Uint8Array(1024*1024*50);  // allocates 50MBytes

error: ORA-65096: invalid common user or role name in oracle

I just installed oracle11g

ORA-65096: invalid common user or role name in oracle

No, you have installed Oracle 12c. That error could only be on 12c, and cannot be on 11g.

Always check your database version up to 4 decimal places:

SELECT banner FROM v$version WHERE ROWNUM = 1;

Oracle 12c multitenant container database has:

  • a root container(CDB)
  • and/or zero, one or many pluggable databases(PDB).

You must have created the database as a container database. While, you are trying to create user in the container, i.e. CDB$ROOT, however, you should create the user in the PLUGGABLE database.

You are not supposed to create application-related objects in the container, the container holds the metadata for the pluggable databases. You should use the pluggable database for you general database operations. Else, do not create it as container, and not use multi-tenancy. However, 12cR2 onward you cannot create a non-container database anyway.

And most probably, the sample schemas might have been already installed, you just need to unlock them in the pluggable database.

For example, if you created pluggable database as pdborcl:

sqlplus SYS/password@PDBORCL AS SYSDBA


sqlplus scott/tiger@pdborcl

SQL> show user;

To show the PDBs and connect to a pluggable database from root container:

SQL> show con_name


SQL> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 ORCLPDB                        READ WRITE NO

SQL> alter session set container = ORCLPDB;

Session altered.

SQL> show con_name;


I suggest read, Oracle 12c Post Installation Mandatory Steps

Note: Answers suggesting to use the _ORACLE_SCRIPT hidden parameter to set to true is dangerous in a production system and might also invalidate your support contract. Beware, without consulting Oracle support DO NOT use hidden parameters.

How can I enable cURL for an installed Ubuntu LAMP stack?

For those who are trying to install php-curl on PHP 7, it will result in an error. Actually if you are installing php-curl in PHP 7, the package name should be;

sudo apt-get install php-curl

Not php5-curl or php7-curl, just php-curl.

How to set DialogFragment's width and height?

Add to your FragmentDialog:

public void onResume() {
    Window window = getDialog().getWindow();
    Point size = new Point();
    Display display = window.getWindowManager().getDefaultDisplay();
    window.setLayout( (int)(size.x * 0.9), WindowManager.LayoutParams.WRAP_CONTENT );
    window.setGravity( Gravity.CENTER );

How to encode the filename parameter of Content-Disposition header in HTTP?

I know this is an old post but it is still very relevant. I have found that modern browsers support rfc5987, which allows utf-8 encoding, percentage encoded (url-encoded). Then Naïve file.txt becomes:

Content-Disposition: attachment; filename*=UTF-8''Na%C3%AFve%20file.txt

Safari (5) does not support this. Instead you should use the Safari standard of writing the file name directly in your utf-8 encoded header:

Content-Disposition: attachment; filename=Naïve file.txt

IE8 and older don't support it either and you need to use the IE standard of utf-8 encoding, percentage encoded:

Content-Disposition: attachment; filename=Na%C3%AFve%20file.txt

In ASP.Net I use the following code:

string contentDisposition;
if (Request.Browser.Browser == "IE" && (Request.Browser.Version == "7.0" || Request.Browser.Version == "8.0"))
    contentDisposition = "attachment; filename=" + Uri.EscapeDataString(fileName);
else if (Request.Browser.Browser == "Safari")
    contentDisposition = "attachment; filename=" + fileName;
    contentDisposition = "attachment; filename*=UTF-8''" + Uri.EscapeDataString(fileName);
Response.AddHeader("Content-Disposition", contentDisposition);

I tested the above using IE7, IE8, IE9, Chrome 13, Opera 11, FF5, Safari 5.

Update November 2013:

Here is the code I currently use. I still have to support IE8, so I cannot get rid of the first part. It turns out that browsers on Android use the built in Android download manager and it cannot reliably parse file names in the standard way.

string contentDisposition;
if (Request.Browser.Browser == "IE" && (Request.Browser.Version == "7.0" || Request.Browser.Version == "8.0"))
    contentDisposition = "attachment; filename=" + Uri.EscapeDataString(fileName);
else if (Request.UserAgent != null && Request.UserAgent.ToLowerInvariant().Contains("android")) // android built-in download manager (all browsers on android)
    contentDisposition = "attachment; filename=\"" + MakeAndroidSafeFileName(fileName) + "\"";
    contentDisposition = "attachment; filename=\"" + fileName + "\"; filename*=UTF-8''" + Uri.EscapeDataString(fileName);
Response.AddHeader("Content-Disposition", contentDisposition);

The above now tested in IE7-11, Chrome 32, Opera 12, FF25, Safari 6, using this filename for download: ??abcABCæøåÆØÅäöüïëêîâéíáóúýñ½§!#¤%&()=`@£$€{[]}+´¨^~'-_,;.txt

On IE7 it works for some characters but not all. But who cares about IE7 nowadays?

This is the function I use to generate safe file names for Android. Note that I don't know which characters are supported on Android but that I have tested that these work for sure:

private static readonly Dictionary<char, char> AndroidAllowedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._-+,@£$€!½§~'=()[]{}0123456789".ToDictionary(c => c);
private string MakeAndroidSafeFileName(string fileName)
    char[] newFileName = fileName.ToCharArray();
    for (int i = 0; i < newFileName.Length; i++)
        if (!AndroidAllowedChars.ContainsKey(newFileName[i]))
            newFileName[i] = '_';
    return new string(newFileName);

@TomZ: I tested in IE7 and IE8 and it turned out that I did not need to escape apostrophe ('). Do you have an example where it fails?

@Dave Van den Eynde: Combining the two file names on one line as according to RFC6266 works except for Android and IE7+8 and I have updated the code to reflect this. Thank you for the suggestion.

@Thilo: No idea about GoodReader or any other non-browser. You might have some luck using the Android approach.

@Alex Zhukovskiy: I don't know why but as discussed on Connect it doesn't seem to work terribly well.

How to output loop.counter in python jinja template?

change this {% if loop.counter == 1 %} to {% if forloop.counter == 1 %} {#your code here#} {%endfor%}

and this from {{ user }} {{loop.counter}} to {{ user }} {{forloop.counter}}

Move SQL data from one table to another

If the two tables use the same ID or have a common UNIQUE key:

1) Insert the selected record in table 2

INSERT INTO table2 SELECT * FROM table1 WHERE (conditions)

2) delete the selected record from table1 if presents in table2

DELETE FROM table1 as A, table2 as B WHERE (A.conditions) AND  (A.ID = B.ID)

Char array in a struct - incompatible assignment?

You can try in this way. I had applied this in my case.


struct name

  char first[20];

  char last[30];



// struct name sara={"Sara","Black"};

int main()



struct name sara={"Sara","Black"};




How do you send a Firebase Notification to all devices via CURL?

Just make all users who log in subscribe to a specific topic, and then send a notification to that topic.

Remove specific characters from a string in Python

How about this:

def text_cleanup(text):
    new = ""
    for i in text:
        if i not in " ?.!/;:":
            new += i
    return new

File name without extension name VBA

Simple but works well for me

FileName = ActiveWorkbook.Name 
If InStr(FileName, ".") > 0 Then 
   FileName = Left(FileName, InStr(FileName, ".") - 1) 
End If

Replace all particular values in a data frame

Like this:

> df[df==""]<-NA
> df
     A    B
1 <NA>   12
2  xyz <NA>
3  jkl  100

Clearing my form inputs after submission

var btnClear = document.querySelector('button');
var inputs = document.querySelectorAll('input');
btnClear.addEventListener('click', () => {
    inputs.forEach(input =>  input.value = '');

What is monkey patching?

No, it's not like any of those things. It's simply the dynamic replacement of attributes at runtime.

For instance, consider a class that has a method get_data. This method does an external lookup (on a database or web API, for example), and various other methods in the class call it. However, in a unit test, you don't want to depend on the external data source - so you dynamically replace the get_data method with a stub that returns some fixed data.

Because Python classes are mutable, and methods are just attributes of the class, you can do this as much as you like - and, in fact, you can even replace classes and functions in a module in exactly the same way.

But, as a commenter pointed out, use caution when monkeypatching:

  1. If anything else besides your test logic calls get_data as well, it will also call your monkey-patched replacement rather than the original -- which can be good or bad. Just beware.

  2. If some variable or attribute exists that also points to the get_data function by the time you replace it, this alias will not change its meaning and will continue to point to the original get_data. (Why? Python just rebinds the name get_data in your class to some other function object; other name bindings are not impacted at all.)

Passing ArrayList through Intent

//arraylist/Pojo you can Pass using bundle  like this 
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
Bundle args = new Bundle();

Get SecondActivity like this
  Intent intent = getIntent();
        Bundle args = intent.getBundleExtra("BUNDLE");
String filter = bundle.getString("imageSliders");

//Happy coding

The module was expected to contain an assembly manifest

First try to open the file with a decompiler such as ILSpy, your dll might be corrupt. I had this error on an online web site, when I downloaded the dll and tried to open it, it was corrupt, probably some error occurred while uploading it via ftp.

What's the best way to convert a number to a string in JavaScript?

If I had to take everything into consideration, I will suggest following

var myint = 1;
var mystring = myint + '';
/*or int to string*/
myint = myint + ''

IMHO, its the fastest way to convert to string. Correct me if I am wrong.

How to find a hash key containing a matching value

You could use hashname.key(valuename)

Or, an inversion may be in order. new_hash = hashname.invert will give you a new_hash that lets you do things more traditionally.

Android XML Percent Symbol

Not exactly your problem but a similar one.

If you have more than one formatting in your string entry, you should not use "%s" multiple times.


<string name="entry">Planned time %s - %s (%s)</string>

DO :

<string name="entry">Planned time %1$s - %2$s (%3$s)</string>

HTML&CSS + Twitter Bootstrap: full page layout or height 100% - Npx

I know it's late in the day but might help someone else!

body,html {
  height: 100%;

.contentarea {

  * replace 160px with the sum of height of all other divs 
  * inc padding, margins etc 
  min-height: calc(100% - 160px); 

Oracle Differences between NVL and Coalesce

COALESCE is more modern function that is a part of ANSI-92 standard.

NVL is Oracle specific, it was introduced in 80's before there were any standards.

In case of two values, they are synonyms.

However, they are implemented differently.

NVL always evaluates both arguments, while COALESCE usually stops evaluation whenever it finds the first non-NULL (there are some exceptions, such as sequence NEXTVAL):

FROM    (
        FROM    dual
        CONNECT BY
                level <= 10000

This runs for almost 0.5 seconds, since it generates SYS_GUID()'s, despite 1 being not a NULL.

FROM    (
        FROM    dual
        CONNECT BY
                level <= 10000

This understands that 1 is not a NULL and does not evaluate the second argument.

SYS_GUID's are not generated and the query is instant.

Can I disable a CSS :hover effect via JavaScript?

There isn’t a pure JavaScript generic solution, I’m afraid. JavaScript isn’t able to turn off the CSS :hover state itself.

You could try the following alternative workaround though. If you don’t mind mucking about in your HTML and CSS a little bit, it saves you having to reset every CSS property manually via JavaScript.


<body class="nojQuery">


/* Limit the hover styles in your CSS so that they only apply when the nojQuery 
class is present */

body.nojQuery ul#mainFilter a:hover {
    /* CSS-only hover styles go here */


// When jQuery kicks in, remove the nojQuery class from the <body> element, thus
// making the CSS hover styles disappear.


Spring Boot Multiple Datasource

I solved the problem (How to connect multiple database using spring and Hibernate) in this way, I hope it will help :)

NOTE: I have added the relevant code, kindly make the dao with the help of impl I used in the below mentioned code.


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi=""
    xmlns="" xmlns:web=""
    id="WebApp_ID" version="3.0">


<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
    xmlns="" xmlns:xsi=""
    <persistence-unit name="localPersistenceUnitOne"
        <exclude-unlisted-classes />
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
            <property name="hibernate.jdbc.batch_size" value="0" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankar?sslmode=require" />
            <property name="hibernate.connection.username" value="username" />
            <property name="hibernate.connection.password" value="password" />
            <property name="" value="update" />
    <persistence-unit name="localPersistenceUnitTwo"
        <exclude-unlisted-classes />
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
            <property name="hibernate.jdbc.batch_size" value="0" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankarTwo?sslmode=require" />
            <property name="hibernate.connection.username" value="username" />
            <property name="hibernate.connection.password" value="password" />
            <property name="" value="update" />


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""
    xmlns:task="" xmlns:p=""
    xmlns:xsi="" xmlns:context=""
    xmlns:mvc="" xmlns:tx=""
    xmlns:aop="" xmlns:util=""
    <!-- Configure messageSource -->

    <mvc:annotation-driven />
    <context:component-scan base-package="in.india.*" />
    <bean id="messageResource"
        <property name="basename" value="messageResource"></property>

        <property name="prefix">
        <property name="suffix">

    <bean id="entityManagerFactoryOne"
        <property name="persistenceUnitName" value="localPersistenceUnitOne" />

    <bean id="messageSource"
        <property name="basename" value="messageResource" />

    <bean id="entityManagerFactoryTwo"
        <property name="persistenceUnitName" value="localPersistenceUnitTwo" />

    <bean id="manager1" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactoryOne" />

    <bean id="manager2" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactoryTwo" />

    <tx:annotation-driven transaction-manager="manager1" />
    <tx:annotation-driven transaction-manager="manager2" />

    <!-- declare dependies here -->

    <bean class="in.india.service.dao.impl.CustomerServiceImpl" />
    <bean class="in.india.service.dao.impl.CompanyServiceImpl" />

    <!-- Configure MVC annotations -->
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />

java class to persist into one database

package in.india.service.dao.impl;

import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Transactional;

public class CompanyServiceImpl implements CompanyService {

    @PersistenceContext(unitName = "entityManagerFactoryTwo")
    EntityManager entityManager;

    public boolean companyService(CompanyDetails companyDetails) {

        boolean flag = false;
            flag = true;
        catch (Exception e)
            flag = false;

        return flag;


java class to persist in another database

package in.india.service.dao.impl;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Transactional;

import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;

public class CustomerServiceImpl implements CustomerService {

    @PersistenceContext(unitName = "localPersistenceUnitOne")
    EntityManager entityManager;

    @Transactional(value = "manager1")
    public boolean customerService(CustomerDetails companyData) {

        boolean flag = false;
        return flag;


<%@page language="java" contentType="text/html; charset=ISO-8859-1"
<%@taglib uri="" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
    <form:form method="GET" action="addCustomer.htm"  modelAttribute="customerBean" >
                <td><form:label path="firstName">First Name</form:label></td>
                <td><form:input path="firstName" /></td>
                <td><form:label path="lastName">Last Name</form:label></td>
                <td><form:input path="lastName" /></td>
                <td><form:label path="emailId">Email Id</form:label></td>
                <td><form:input path="emailId" /></td>
                <td><form:label path="profession">Profession</form:label></td>
                <td><form:input path="profession" /></td>
                <td><form:label path="address">Address</form:label></td>
                <td><form:input path="address" /></td>
                <td><form:label path="age">Age</form:label></td>
                <td><form:input path="age" /></td>
                <td><input type="submit" value="Submit"/></td>


<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <form:form method="GET" action="addCompany.htm"  modelAttribute="companyBean" >
        <td><form:label path="companyName">Company Name</form:label></td>
        <td><form:input path="companyName" /></td>
        <td><form:label path="companyStrength">Company Strength</form:label></td>
        <td><form:input path="companyStrength" /></td>
        <td><form:label path="companyLocation">Company Location</form:label></td>
        <td><form:input path="companyLocation" /></td>
            <input type="submit" value="Submit"/>


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <center><h1>Multiple Database Connectivity In Spring sdfsdsd</h1></center>

<a href='customerRequest.htm'>Click here to go on Customer page</a>
<a href='companyRequest.htm'>Click here to go on Company page</a>


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <b>Successfully Saved</b>


package in.india.controller;

import in.india.bean.CompanyBean;
import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

public class CompanyController {

    CompanyService companyService;

    @RequestMapping(value = "/companyRequest.htm", method = RequestMethod.GET)
    public ModelAndView addStudent(ModelMap model) {
        CompanyBean companyBean = new CompanyBean();
        return new ModelAndView("company");

    @RequestMapping(value = "/addCompany.htm", method = RequestMethod.GET)
    public ModelAndView companyController(@ModelAttribute("companyBean") CompanyBean companyBean, Model model) {
        CompanyDetails  companyDetails = new CompanyDetails();
        return new ModelAndView("success");



package in.india.controller;

import in.india.bean.CustomerBean;
import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

public class CustomerController {

    CustomerService customerService;

    @RequestMapping(value = "/customerRequest.htm", method = RequestMethod.GET)
    public ModelAndView addStudent(ModelMap model) {
        CustomerBean customerBean = new CustomerBean();
        return new ModelAndView("customer");

    @RequestMapping(value = "/addCustomer.htm", method = RequestMethod.GET)
    public ModelAndView customerController(@ModelAttribute("customerBean") CustomerBean customer, Model model) {
        CustomerDetails customerDetails = new CustomerDetails();
        return new ModelAndView("success");


CompanyDetails Entity

package in.india.entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Table(name = "company_details")
public class CompanyDetails {

    @SequenceGenerator(name = "company_details_seq", sequenceName = "company_details_seq", initialValue = 1, allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "company_details_seq")
    @Column(name = "company_details_id")
    private Long companyDetailsId;
    @Column(name = "company_name")
    private String companyName;
    @Column(name = "company_strength")
    private Long companyStrength;
    @Column(name = "company_location")
    private String companyLocation;

    public Long getCompanyDetailsId() {
        return companyDetailsId;

    public void setCompanyDetailsId(Long companyDetailsId) {
        this.companyDetailsId = companyDetailsId;

    public String getCompanyName() {
        return companyName;

    public void setCompanyName(String companyName) {
        this.companyName = companyName;

    public Long getCompanyStrength() {
        return companyStrength;

    public void setCompanyStrength(Long companyStrength) {
        this.companyStrength = companyStrength;

    public String getCompanyLocation() {
        return companyLocation;

    public void setCompanyLocation(String companyLocation) {
        this.companyLocation = companyLocation;

CustomerDetails Entity

package in.india.entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Table(name = "customer_details")
public class CustomerDetails {

    @SequenceGenerator(name = "customer_details_seq", sequenceName = "customer_details_seq", initialValue = 1, allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "customer_details_seq")
    @Column(name = "customer_details_id")
    private Long customerDetailsId;
    @Column(name = "first_name ")
    private String firstName;
    @Column(name = "last_name ")
    private String lastName;
    @Column(name = "email_id")
    private String emailId;
    @Column(name = "profession")
    private String profession;
    @Column(name = "address")
    private String address;
    @Column(name = "age")
    private int age;
    public Long getCustomerDetailsId() {
        return customerDetailsId;

    public void setCustomerDetailsId(Long customerDetailsId) {
        this.customerDetailsId = customerDetailsId;

    public String getFirstName() {
        return firstName;

    public void setFirstName(String firstName) {
        this.firstName = firstName;

    public String getLastName() {
        return lastName;

    public void setLastName(String lastName) {
        this.lastName = lastName;

    public String getEmailId() {
        return emailId;

    public void setEmailId(String emailId) {
        this.emailId = emailId;

    public String getProfession() {
        return profession;

    public void setProfession(String profession) {
        this.profession = profession;

    public String getAddress() {
        return address;

    public void setAddress(String address) {
        this.address = address;

    public int getAge() {
        return age;

    public void setAge(int age) {
        this.age = age;

Python: split a list based on a condition?

Concise and Elegant

Inspired by DanSalmo's comment, here is a solution that is concise, elegant, and at the same time is one of the fastest solutions.

good, bad = [], []
for item in my_list:
    good.append(item) if item in set(goodvals) else bad.append(item)

Tip: Turning goodval into a set gives us an easy 40% speed boost.


If you have the need for maximum speed, we take the fastest answer and turbocharge it by turning good_list into a set. That gives us a 45% speed boost, and we end up with a solution that is more than 5.5x as fast as the slowest solution, even while it remains readable.

good_list_set = set(good_list)  # 45% faster than a tuple.

good, bad = [], []
for item in my_origin_list:
    if item in good_list_set:

A little shorter:

good_list_set = set(good_list)  # 45% faster than a tuple.

good, bad = [], []
for item in my_origin_list:
    out = good if item in good_list_set else bad

Elegance can be somewhat subjective, but some of the Rube Goldberg style solutions that are cute and ingenious are quite concerning and should not be used in production code in any language, let alone python which is elegant at heart.

Benchmark results:

filter_BJHomer                  80/s       --   -3265%   -5312%   -5900%   -6262%   -7273%   -7363%   -8051%   -8162%   -8244%
zip_Funky                       118/s    4848%       --   -3040%   -3913%   -4450%   -5951%   -6085%   -7106%   -7271%   -7393%
two_lst_tuple_JohnLaRoy         170/s   11332%    4367%       --   -1254%   -2026%   -4182%   -4375%   -5842%   -6079%   -6254%
if_else_DBR                     195/s   14392%    6428%    1434%       --    -882%   -3348%   -3568%   -5246%   -5516%   -5717%
two_lst_compr_Parand            213/s   16750%    8016%    2540%     967%       --   -2705%   -2946%   -4786%   -5083%   -5303%
if_else_1_line_DanSalmo         292/s   26668%   14696%    7189%    5033%    3707%       --    -331%   -2853%   -3260%   -3562%
tuple_if_else                   302/s   27923%   15542%    7778%    5548%    4177%     343%       --   -2609%   -3029%   -3341%
set_1_line                      409/s   41308%   24556%   14053%   11035%    9181%    3993%    3529%       --    -569%    -991%
set_shorter                     434/s   44401%   26640%   15503%   12303%   10337%    4836%    4345%     603%       --    -448%
set_if_else                     454/s   46952%   28358%   16699%   13349%   11290%    5532%    5018%    1100%     469%       --

The full benchmark code for Python 3.7 (modified from FunkySayu):

good_list = ['.jpg','.jpeg','.gif','.bmp','.png']

import random
import string
my_origin_list = []
for i in range(10000):
    fname = ''.join(random.choice(string.ascii_lowercase) for i in range(random.randrange(10)))
    if random.getrandbits(1):
        fext = random.choice(list(good_list))
        fext = "." + ''.join(random.choice(string.ascii_lowercase) for i in range(3))

    my_origin_list.append((fname + fext, random.randrange(1000), fext))

# Parand
def two_lst_compr_Parand(*_):
    return [e for e in my_origin_list if e[2] in good_list], [e for e in my_origin_list if not e[2] in good_list]

# dbr
def if_else_DBR(*_):
    a, b = list(), list()
    for e in my_origin_list:
        if e[2] in good_list:
    return a, b

# John La Rooy
def two_lst_tuple_JohnLaRoy(*_):
    a, b = list(), list()
    for e in my_origin_list:
        (b, a)[e[2] in good_list].append(e)
    return a, b

# # Ants Aasma
# def f4():
#     l1, l2 = tee((e[2] in good_list, e) for e in my_origin_list)
#     return [i for p, i in l1 if p], [i for p, i in l2 if not p]

# My personal way to do
def zip_Funky(*_):
    a, b = zip(*[(e, None) if e[2] in good_list else (None, e) for e in my_origin_list])
    return list(filter(None, a)), list(filter(None, b))

# BJ Homer
def filter_BJHomer(*_):
    return list(filter(lambda e: e[2] in good_list, my_origin_list)), list(filter(lambda e: not e[2] in good_list,                                                                             my_origin_list))

# ChaimG's answer; as a list.
def if_else_1_line_DanSalmo(*_):
    good, bad = [], []
    for e in my_origin_list:
        _ = good.append(e) if e[2] in good_list else bad.append(e)
    return good, bad

# ChaimG's answer; as a set.
def set_1_line(*_):
    good_list_set = set(good_list)
    good, bad = [], []
    for e in my_origin_list:
        _ = good.append(e) if e[2] in good_list_set else bad.append(e)
    return good, bad

# ChaimG set and if else list.
def set_shorter(*_):
    good_list_set = set(good_list)
    good, bad = [], []
    for e in my_origin_list:
        out = good if e[2] in good_list_set else bad
    return good, bad

# ChaimG's best answer; if else as a set.
def set_if_else(*_):
    good_list_set = set(good_list)
    good, bad = [], []
    for e in my_origin_list:
        if e[2] in good_list_set:
    return good, bad

# ChaimG's best answer; if else as a set.
def tuple_if_else(*_):
    good_list_tuple = tuple(good_list)
    good, bad = [], []
    for e in my_origin_list:
        if e[2] in good_list_tuple:
    return good, bad

def cmpthese(n=0, functions=None):
    results = {}
    for func_name in functions:
        args = ['%s(range(256))' % func_name, 'from __main__ import %s' % func_name]
        t = Timer(*args)
        results[func_name] = 1 / (t.timeit(number=n) / n) # passes/sec

    functions_sorted = sorted(functions, key=results.__getitem__)
    for f in functions_sorted:
        diff = []
        for func in functions_sorted:
            if func == f:
                diff.append(f"{results[f]/results[func]*100 - 100:5.0%}")
        diffs = " ".join(f'{x:>8s}' for x in diff)

        print(f"{f:27s} \t{results[f]:,.0f}/s {diffs}")

if __name__=='__main__':
    from timeit import Timer
cmpthese(1000, 'two_lst_compr_Parand if_else_DBR two_lst_tuple_JohnLaRoy zip_Funky filter_BJHomer if_else_1_line_DanSalmo set_1_line set_if_else tuple_if_else set_shorter'.split(" "))

Can Mockito capture arguments of a method called multiple times?

I think it should be

verify(mockBar, times(2)).doSomething(...)

Sample from mockito javadoc:

ArgumentCaptor<Person> peopleCaptor = ArgumentCaptor.forClass(Person.class);
verify(mock, times(2)).doSomething(peopleCaptor.capture());

List<Person> capturedPeople = peopleCaptor.getAllValues();
assertEquals("John", capturedPeople.get(0).getName());
assertEquals("Jane", capturedPeople.get(1).getName());

How to convert java.lang.Object to ArrayList?

Rather Cast It to an Object Array.

Object obj2 = from some source . . ;
Object[] objects=(Object[])obj2;

Change IPython/Jupyter notebook working directory

As MrFancypants mentioned in the comments, if you are using Jupyter (which you should, since it currently supersedes the older IPython Notebook project), things are a little different. For one, there are no profiles any more.

After installing Jupyter, first check your ~/.jupyter folder to see its content. If no config files were migrated from the default IPython profile (as they weren't in my case), create a new one for Jupyter Notebook:

jupyter notebook --generate-config

This generates ~/.jupyter/ file with some helpfully commented possible options. To set the default directory add:

c.NotebookApp.notebook_dir = u'/absolute/path/to/notebook/directory'

As I switch between Linux and OS X, I wanted to use a path relative to my home folder (as they differ – /Users/username and /home/username), so I set something like:

import os
c.NotebookApp.notebook_dir = os.path.expanduser('~/Dropbox/dev/notebook')

Now, whenever I run jupyter notebook, it opens my desired notebook folder. I also version the whole ~/.jupyter folder in my dotfiles repository that I deploy to every new work machine.

As an aside, you can still use the --notebook-dir command line option, so maybe a simple alias would suit your needs better.

jupyter notebook --notebook-dir=/absolute/path/to/notebook/directory

Which comment style should I use in batch files?

After I realized that I could use label :: to make comments and comment out code REM just looked plain ugly to me. As has been mentioned the double-colon can cause problems when used inside () blocked code, but I've discovered a work-around by alternating between the labels :: and :space

:: This, of course, does
:: not cause errors.

  :: But
   : neither
  :: does
   : this.

It's not ugly like REM, and actually adds a little style to your code.

So outside of code blocks I use :: and inside them I alternate between :: and :.

By the way, for large hunks of comments, like in the header of your batch file, you can avoid special commands and characters completely by simply gotoing over your comments. This let's you use any method or style of markup you want, despite that fact that if CMD ever actually tried to processes those lines it'd throw a hissy.

@echo off
goto :TopOfCode


  COOLCODE [/?] | [ [/a][/c:[##][a][b][c]] INPUTFILE OUTPUTFILE ]

       /?    - This menu
       /a    - Some option
       /c:## - Where ## is which line number to begin the processing at.
         :a  - Some optional method of processing
         :b  - A third option for processing
         :c  - A forth option
  INPUTFILE  - The file to process.
  OUTPUTFILE - Store results here.

   Bla bla bla.


Use what ever notation you wish *'s, @'s etc.

Initializing C dynamic arrays

p = {1,2,3} is wrong.

You can never use this:

int * p;
p = {1,2,3};

loop is right

int *p,i;
p = malloc(3*sizeof(int));
for(i = 0; i<3; ++i)
    p[i] = i;

Easiest way to copy a single file from host to Vagrant guest?

Try this.. vagrant ubuntu 14.04 This worked for me.

scp -r -P 2222 vagrant@localhost:/home .

Finding the direction of scrolling in a UIScrollView?

If you work with UIScrollView and UIPageControl, this method will also change the PageControl's page view.

  func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    let targetOffset = targetContentOffset.memory.x
    let widthPerPage = scrollView.contentSize.width / CGFloat(pageControl.numberOfPages)

    let currentPage = targetOffset / widthPerPage
    pageControl.currentPage = Int(currentPage)

Thanks @Esq 's Swift code.

IntelliJ shortcut to show a popup of methods in a class that can be searched

command+fn+F12 is correct. Lacking of button fn the F12 is used adjust the volume.

How to correctly catch change/focusOut event on text input in React.js?

You'd need to be careful as onBlur has some caveats in IE11 (How to use relatedTarget (or equivalent) in IE?,

There is, however, no way to use onFocusOut in React as far as I can tell. See the issue on their github if you need more information.

What is the difference between public, protected, package-private and private in Java?

The difference can be found in the links already provided but which one to use usually comes down to the "Principle of Least Knowledge". Only allow the least visibility that is needed.

How to encrypt String in Java

Like many of the guys have already told, you should use a standard cypher that is overly used like DES or AES.

A simple example of how you can encrypt and decrypt a string in java using AES.

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class EncryptorDemo {

    public static String encrypt(String key, String randomVector, String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(randomVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(value.getBytes());
            System.out.println("encrypted text: "  + Base64.encodeBase64String(encrypted));
            return Base64.encodeBase64String(encrypted);
        } catch (Exception e) {
        return null;

    public static String decrypt(String key, String randomVector, String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(randomVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] originalText = cipher.doFinal(Base64.decodeBase64(encrypted));
            System.out.println("decrypted text: "  + new String(originalText));
            return new String(originalText);
        } catch (Exception e) {
        return null;

    public static void main(String[] args) {
        String key = "JavasEncryptDemo"; // 128 bit key
        String randomVector = "RandomJavaVector"; // 16 bytes IV
        decrypt(key, randomVector, encrypt(key, randomVector, "Anything you want to encrypt!"));


How should I use try-with-resources with JDBC?

I realize this was long ago answered but want to suggest an additional approach that avoids the nested try-with-resources double block.

public List<User> getUser(int userId) {
    try (Connection con = DriverManager.getConnection(myConnectionURL);
         PreparedStatement ps = createPreparedStatement(con, userId); 
         ResultSet rs = ps.executeQuery()) {

         // process the resultset here, all resources will be cleaned up

    } catch (SQLException e) {

private PreparedStatement createPreparedStatement(Connection con, int userId) throws SQLException {
    String sql = "SELECT id, username FROM users WHERE id = ?";
    PreparedStatement ps = con.prepareStatement(sql);
    ps.setInt(1, userId);
    return ps;

General guidelines to avoid memory leaks in C++

Manage memory the same way you manage other resources (handles, files, db connections, sockets...). GC would not help you with them either.

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing

I had a similar problem and although I made sure that referenced entities were saved first it keeps failing with the same exception. After hours of investigation it turns out that the problem was because the "version" column of the referenced entity was NULL. In my particular setup i was inserting it first in an HSQLDB(that was a unit test) a row like that:

INSERT INTO project VALUES (1,1,'2013-08-28 13:05:38','2013-08-28 13:05:38','aProject','aa',NULL,'bb','dd','ee','ff','gg','ii',NULL,'LEGACY','0','CREATED',NULL,NULL,1,'0',NULL,NULL,NULL,NULL,'0','0', NULL);

The problem of the above is the version column used by hibernate was set to null, so even if the object was correctly saved, Hibernate considered it as unsaved. When making sure the version had a NON-NULL(1 in this case) value the exception disappeared and everything worked fine.

I am putting it here in case someone else had the same problem, since this took me a long time to figure this out and the solution is completely different than the above.

Get all files that have been modified in git branch

The following batch file is based on twalberg's answer but will work in Windows:

C:                               :: <== OR USE A DIFFERENT DRIVE
CD \path\to\where\git\files\are  :: <== CHANGE TO THE ACTUAL PATH
SET /p b="Enter full path of an ALREADY MERGED branch to compare with origin/master: "
bash --login -i -c "git diff --name-only %b% $(git merge-base %b1% origin/drop2/master)"

The above assumes that the main branch is origin/master and that git bash was included when Git was installed (and its location is in the path environment). I actually needed to show the actual differences using a configured diff tool (kdiff3) so substituted the following bash command above:

bash --login -i -c "git difftool --dir-diff %b% $(git merge-base %b1% origin/drop2/master)"

How can I generate a 6 digit unique number?

If you want it to start at 000001 and go to 999999:

$num_str = sprintf("%06d", mt_rand(1, 999999));

Mind you, it's stored as a string.

PHP sessions default timeout

It depends on the server configuration or the relevant directives session.gc_maxlifetime in php.ini.

Typically the default is 24 minutes (1440 seconds), but your webhost may have altered the default to something else.

Build an iOS app without owning a mac?

My experience is that Ionic Pro ( can do the most of the Development and Publish job but you still need Mac or Mac in cloud at these steps:

  • create .p12 Certification file
  • upload the .ipa file to the App Store

After you created your Certification file, You can upload it to Ionic Pro. You can build .ipa files with proper credentials in cloud. But unfortunately I didn't found another way to upload the .ipa file to App Store, only with Application Loader from Mac.

So I decided to use a pay-as-you-go Mac in cloud account (you pay only for minutes you are logged in) since the time I spend on Mac is very limited (few minutes per App publication).

Search and get a line in Python

>>> for x in items:

you can also get the line if there are other characters before token


The above works like grep token on unix and keyword 'in' or .contains in python and C#


token qwerty

''' matches the following 2 lines

token qwerty

jQuery - How to dynamically add a validation rule

You need to call .validate() before you can add rules this way, like this:

$("#myForm").validate(); //sets up the validator
$("input[id*=Hours]").rules("add", "required");

The .validate() documentation is a good guide, here's the blurb about .rules("add", option):

Adds the specified rules and returns all rules for the first matched element. Requires that the parent form is validated, that is, $("form").validate() is called first.

Safari 3rd party cookie iframe trick no longer working?

I used modified (added signed_request param to the link) Whiteagle's trick and it worked ok for safari, but IE is constantly refreshing the page in that case. So my solution for safari and internet explorer is:

$fbapplink = '[appnamespace]/';
$isms = stripos($_SERVER['HTTP_USER_AGENT'], 'msie') !== false;

// safari fix
if(! $isms  && !isset($_SESSION['signed_request'])) {

    if (isset($_GET["start_session"])) {
        $_SESSION['signed_request'] = $_GET['signed_request'];
        die(header("Location:" . $fbapplink ));

    if (!isset($_GET["sid"])) {
        die(header("Location:?sid=" . session_id() . '&signed_request='.$_REQUEST['signed_request']));
    $sid = session_id();
    if (empty($sid) || $_GET["sid"] != $sid) {

// IE fix
header('P3P: CP="CAO PSA OUR"');
header('P3P: CP="HONK"');

.. later in the code

$sr = $_REQUEST['signed_request'];
if($sr) {
        $_SESSION['signed_request'] = $sr;
} else {
        $sr = $_SESSION['signed_request'];

How do you say not equal to in Ruby?

Yes. In Ruby the not equal to operator is:


You can get a full list of ruby operators here:

How to make the script wait/sleep in a simple way in unity

There are many ways to wait in Unity. It is really simple but I think it's worth covering most ways to do these:

1.With a coroutine and WaitForSeconds.

The is by far the simplest way. Put all the code that you need to wait for some time in a coroutine function then you can wait with WaitForSeconds. Note that in coroutine function, you call the function with StartCoroutine(yourFunction).

Example below will rotate 90 deg, wait for 4 seconds, rotate 40 deg and wait for 2 seconds, and then finally rotate rotate 20 deg.

void Start()

IEnumerator waiter()
    //Rotate 90 deg
    transform.Rotate(new Vector3(90, 0, 0), Space.World);

    //Wait for 4 seconds
    yield return new WaitForSeconds(4);

    //Rotate 40 deg
    transform.Rotate(new Vector3(40, 0, 0), Space.World);

    //Wait for 2 seconds
    yield return new WaitForSeconds(2);

    //Rotate 20 deg
    transform.Rotate(new Vector3(20, 0, 0), Space.World);

2.With a coroutine and WaitForSecondsRealtime.

The only difference between WaitForSeconds and WaitForSecondsRealtime is that WaitForSecondsRealtime is using unscaled time to wait which means that when pausing a game with Time.timeScale, the WaitForSecondsRealtime function would not be affected but WaitForSeconds would.

void Start()

IEnumerator waiter()
    //Rotate 90 deg
    transform.Rotate(new Vector3(90, 0, 0), Space.World);

    //Wait for 4 seconds
    yield return new WaitForSecondsRealtime(4);

    //Rotate 40 deg
    transform.Rotate(new Vector3(40, 0, 0), Space.World);

    //Wait for 2 seconds
    yield return new WaitForSecondsRealtime(2);

    //Rotate 20 deg
    transform.Rotate(new Vector3(20, 0, 0), Space.World);

Wait and still be able to see how long you have waited:

3.With a coroutine and incrementing a variable every frame with Time.deltaTime.

A good example of this is when you need the timer to display on the screen how much time it has waited. Basically like a timer.

It's also good when you want to interrupt the wait/sleep with a boolean variable when it is true. This is where yield break; can be used.

bool quit = false;

void Start()

IEnumerator waiter()
    float counter = 0;
    //Rotate 90 deg
    transform.Rotate(new Vector3(90, 0, 0), Space.World);

    //Wait for 4 seconds
    float waitTime = 4;
    while (counter < waitTime)
        //Increment Timer until counter >= waitTime
        counter += Time.deltaTime;
        Debug.Log("We have waited for: " + counter + " seconds");
        //Wait for a frame so that Unity doesn't freeze
        //Check if we want to quit this function
        if (quit)
            //Quit function
            yield break;
        yield return null;

    //Rotate 40 deg
    transform.Rotate(new Vector3(40, 0, 0), Space.World);

    //Wait for 2 seconds
    waitTime = 2;
    //Reset counter
    counter = 0;
    while (counter < waitTime)
        //Increment Timer until counter >= waitTime
        counter += Time.deltaTime;
        Debug.Log("We have waited for: " + counter + " seconds");
        //Check if we want to quit this function
        if (quit)
            //Quit function
            yield break;
        //Wait for a frame so that Unity doesn't freeze
        yield return null;

    //Rotate 20 deg
    transform.Rotate(new Vector3(20, 0, 0), Space.World);

You can still simplify this by moving the while loop into another coroutine function and yielding it and also still be able to see it counting and even interrupt the counter.

bool quit = false;

void Start()

IEnumerator waiter()
    //Rotate 90 deg
    transform.Rotate(new Vector3(90, 0, 0), Space.World);

    //Wait for 4 seconds
    float waitTime = 4;
    yield return wait(waitTime);

    //Rotate 40 deg
    transform.Rotate(new Vector3(40, 0, 0), Space.World);

    //Wait for 2 seconds
    waitTime = 2;
    yield return wait(waitTime);

    //Rotate 20 deg
    transform.Rotate(new Vector3(20, 0, 0), Space.World);

IEnumerator wait(float waitTime)
    float counter = 0;

    while (counter < waitTime)
        //Increment Timer until counter >= waitTime
        counter += Time.deltaTime;
        Debug.Log("We have waited for: " + counter + " seconds");
        if (quit)
            //Quit function
            yield break;
        //Wait for a frame so that Unity doesn't freeze
        yield return null;

Wait/Sleep until variable changes or equals to another value:

4.With a coroutine and the WaitUntil function:

Wait until a condition becomes true. An example is a function that waits for player's score to be 100 then loads the next level.

float playerScore = 0;
int nextScene = 0;

void Start()

IEnumerator sceneLoader()
    Debug.Log("Waiting for Player score to be >=100 ");
    yield return new WaitUntil(() => playerScore >= 10);
    Debug.Log("Player score is >=100. Loading next Leve");

    //Increment and Load next scene

5.With a coroutine and the WaitWhile function.

Wait while a condition is true. An example is when you want to exit app when the escape key is pressed.

void Start()

IEnumerator inputWaiter()
    Debug.Log("Waiting for the Exit button to be pressed");
    yield return new WaitWhile(() => !Input.GetKeyDown(KeyCode.Escape));
    Debug.Log("Exit button has been pressed. Leaving Application");

    //Exit program

void Quit()
    UnityEditor.EditorApplication.isPlaying = false;

6.With the Invoke function:

You can call tell Unity to call function in the future. When you call the Invoke function, you can pass in the time to wait before calling that function to its second parameter. The example below will call the feedDog() function after 5 seconds the Invoke is called.

void Start()
    Invoke("feedDog", 5);
    Debug.Log("Will feed dog after 5 seconds");

void feedDog()
    Debug.Log("Now feeding Dog");

7.With the Update() function and Time.deltaTime.

It's just like #3 except that it does not use coroutine. It uses the Update function.

The problem with this is that it requires so many variables so that it won't run every time but just once when the timer is over after the wait.

float timer = 0;
bool timerReached = false;

void Update()
    if (!timerReached)
        timer += Time.deltaTime;

    if (!timerReached && timer > 5)
        Debug.Log("Done waiting");

        //Set to false so that We don't run this again
        timerReached = true;

void feedDog()
    Debug.Log("Now feeding Dog");

There are still other ways to wait in Unity but you should definitely know the ones mentioned above as that makes it easier to make games in Unity. When to use each one depends on the circumstances.

For your particular issue, this is the solution:

IEnumerator showTextFuntion()
    TextUI.text = "Welcome to Number Wizard!";
    yield return new WaitForSeconds(3f);
    TextUI.text = ("The highest number you can pick is " + max);
    yield return new WaitForSeconds(3f);
    TextUI.text = ("The lowest number you can pick is " + min);

And to call/start the coroutine function from your start or Update function, you call it with

StartCoroutine (showTextFuntion());

Wipe data/Factory reset through ADB

After a lot of digging around I finally ended up downloading the source code of the recovery section of Android. Turns out you can actually send commands to the recovery.

 * The arguments which may be supplied in the recovery.command file:
 *   --send_intent=anystring - write the text out to recovery.intent
 *   --update_package=path - verify install an OTA package file
 *   --wipe_data - erase user data (and cache), then reboot
 *   --wipe_cache - wipe cache (but not user data), then reboot
 *   --set_encrypted_filesystem=on|off - enables / diasables encrypted fs

Those are the commands you can use according to the one I found but that might be different for modded files. So using adb you can do this:

adb shell
recovery --wipe_data

Using --wipe_data seemed to do what I was looking for which was handy although I have not fully tested this as of yet.


For anyone still using this topic, these commands may change based on which recovery you are using. If you are using Clockword recovery, these commands should still work. You can find other commands in /cache/recovery/command

For more information please see here:

Reading file line by line (with space) in Unix Shell scripting - Issue

You want to read raw lines to avoid problems with backslashes in the input (use -r):

while read -r line; do
   printf "<%s>\n" "$line"
done < file.txt

This will keep whitespace within the line, but removes leading and trailing whitespace. To keep those as well, set the IFS empty, as in

while IFS= read -r line; do
   printf "%s\n" "$line"
done < file.txt

This now is an equivalent of cat < file.txt as long as file.txt ends with a newline.

Note that you must double quote "$line" in order to keep word splitting from splitting the line into separate words--thus losing multiple whitespace sequences.

Delete all nodes and relationships in neo4j 1.8

Neo4j cannot delete nodes that have a relation. You have to delete the relations before you can delete the nodes.

But, it is simple way to delete "ALL" nodes and "ALL" relationships with a simple chyper. This is the code:


--> DETACH DELETE will remove all of the nodes and relations by Match

Understanding generators in Python

It helps to make a clear distinction between the function foo, and the generator foo(n):

def foo(n):
    yield n
    yield n+1

foo is a function. foo(6) is a generator object.

The typical way to use a generator object is in a loop:

for n in foo(6):

The loop prints

# 6
# 7

Think of a generator as a resumable function.

yield behaves like return in the sense that values that are yielded get "returned" by the generator. Unlike return, however, the next time the generator gets asked for a value, the generator's function, foo, resumes where it left off -- after the last yield statement -- and continues to run until it hits another yield statement.

Behind the scenes, when you call bar=foo(6) the generator object bar is defined for you to have a next attribute.

You can call it yourself to retrieve values yielded from foo:

next(bar)    # Works in Python 2.6 or Python 3.x   # Works in Python 2.5+, but is deprecated. Use next() if possible.

When foo ends (and there are no more yielded values), calling next(bar) throws a StopInteration error.

What does [object Object] mean?

[object Object] is the default toString representation of an object in javascript.

If you want to know the properties of your object, just foreach over it like this:

for(var property in obj) {
    alert(property + "=" + obj[property]);

In your particular case, you are getting a jQuery object. Try doing this instead:

$('#senddvd').click(function ()
   var a=whichIsVisible();

This should alert the id of the visible element.

How do I combine the first character of a cell with another cell in Excel?

This is what formula I used in order to get the first letter of the first name and first letter of the last name from 2 different cells into one:

Lee Ackerman = LA

jQuery Refresh/Reload Page if Ajax Success after time

var val = $.parseJSON(data);
if(val.success == true)
 setTimeout(function(){ location.reload(); }, 5000);


Will using 'var' affect performance?

There is no runtime performance cost to using var. Though, I would suspect there to be a compiling performance cost as the compiler needs to infer the type, though this will most likely be negligable.

What is the "Illegal Instruction: 4" error and why does "-mmacosx-version-min=10.x" fix it?

The "illegal instruction" message is simply telling you that your binaries contain instructions the version of the OS that you are attempting to run them under does not understand. I can't give you the precise meaning of 4 but I expect that is internal to Apple.

Otherwise take a look at these... they are a little old, but probably tell you what you need to know

How does 64 bit code work on OS-X 10.5?
what does macosx-version-min imply?

How do I give ASP.NET permission to write to a folder in Windows 7?

I know this is an old thread but to further expand the answer here, by default IIS 7.5 creates application pool identity accounts to run the worker process under. You can't search for these accounts like normal user accounts when adding file permissions. To add them into NTFS permission ACL you can type the entire name of the application pool identity and it will work.

It is just a slight difference in the way the application pool identity accounts are handle as they are seen to be virtual accounts.

Also the username of the application pool identity is "IIS AppPool\application pool name" so if it was the application pool DefaultAppPool the user account would be "IIS AppPool\DefaultAppPool".

These can be seen if you open computer management and look at the members of the local group IIS_IUSRS. The SID appended to the end of them is not need when adding the account into an NTFS permission ACL.

Hope that helps

Creating an instance of class

   /* 1 */ Foo* foo1 = new Foo ();

Creates an object of type Foo in dynamic memory. foo1 points to it. Normally, you wouldn't use raw pointers in C++, but rather a smart pointer. If Foo was a POD-type, this would perform value-initialization (it doesn't apply here).

   /* 2 */ Foo* foo2 = new Foo;

Identical to before, because Foo is not a POD type.

   /* 3 */ Foo foo3;

Creates a Foo object called foo3 in automatic storage.

   /* 4 */ Foo foo4 = Foo::Foo();

Uses copy-initialization to create a Foo object called foo4 in automatic storage.

   /* 5 */ Bar* bar1 = new Bar ( *new Foo() );

Uses Bar's conversion constructor to create an object of type Bar in dynamic storage. bar1 is a pointer to it.

   /* 6 */ Bar* bar2 = new Bar ( *new Foo );

Same as before.

   /* 7 */ Bar* bar3 = new Bar ( Foo foo5 );

This is just invalid syntax. You can't declare a variable there.

   /* 8 */ Bar* bar3 = new Bar ( Foo::Foo() );

Would work and work by the same principle to 5 and 6 if bar3 wasn't declared on in 7.

5 & 6 contain memory leaks.

Syntax like new Bar ( Foo::Foo() ); is not usual. It's usually new Bar ( (Foo()) ); - extra parenthesis account for most-vexing parse. (corrected)

Cannot retrieve string(s) from preferences (settings)

All your exercise conditionals are separate and the else is only tied to the last if statement. Use else if to bind them all together in the way I believe you intend.

How to downgrade python from 3.7 to 3.6

If you use anaconda, you can just create a new environment with the specified version. In case you don't want to keep the existing version 3.7, you can just uninstall it and install it from here.

Does not contain a static 'main' method suitable for an entry point

For future readers who faced same issue with Windows Forms Application, one solution is to add these lines to your main/start up form class:

    static void Main()
        Application.Run(new MyMainForm());

Then go to project properties > Application > Startup Object dropdown, should see the namespace.MyMainForm, select it, clean and build the solution. And it should work.

PermGen elimination in JDK 8

Reasons of ignoring these argument is permanent generation has been removed in HotSpot for JDK8 because of following drawbacks

  • Fixed size at startup – difficult to tune.
  • Internal Hotspot types were Java objects : Could move with full GC, opaque, not strongly typed and hard to debug, needed meta-metadata.
  • Simplify full collections : Special iterators for metadata for each collector
  • Want to deallocate class data concurrently and not during GC pause
  • Enable future improvements that were limited by PermGen.

The Permanent Generation (PermGen) space has completely been removed and is kind of replaced by a new space called Metaspace. The consequences of the PermGen removal is that obviously the PermSize and MaxPermSize JVM arguments are ignored and you will never get a java.lang.OutOfMemoryError: PermGen error.

Advantages of MetaSpace

  • Take advantage of Java Language Specification property : Classes and associated metadata lifetimes match class loader’s
  • Per loader storage area – Metaspace
  • Linear allocation only
  • No individual reclamation (except for RedefineClasses and class loading failure)
  • No GC scan or compaction
  • No relocation for metaspace objects

Metaspace Tuning

The maximum metaspace size can be set using the -XX:MaxMetaspaceSize flag, and the default is unlimited, which means that only your system memory is the limit. The -XX:MetaspaceSize tuning flag defines the initial size of metaspace If you don’t specify this flag, the Metaspace will dynamically re-size depending of the application demand at runtime.

Change enables other optimizations and features in the future

  • Application class data sharing
  • Young collection optimizations, G1 class unloading
  • Metadata size reductions and internal JVM footprint projects

There is improved GC performace also.

How to sync with a remote Git repository?

Assuming their updates are on master, and you are on the branch you want to merge the changes into.

git remote add origin<github-username>/<repo-name>.git
git pull origin master

Also note that you will then want to push the merge back to your copy of the repository:

git push origin master

How to while loop until the end of a file in Python without checking for empty line?

Find end position of file:

f = open("file.txt","r"),2) #Jumps to the end
f.tell()    #Give you the end location (characters from start)   #Jump to the beginning of the file again

Then you can to:

if line == '' and f.tell() == endLocation:

Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy

In case it helps anyone, my issue was extremely silly. Totally my fault of course. A notification was triggering a method that was calling the modal. But I wasn't removing the notification correctly, so at some point, I would have more than one notification, so the modal would get called multiple times. Of course, after you call the modal once, the viewcontroller that calls it it's not longer in the view hierarchy, that's why we see this issue. My situation caused a bunch of other issue too, as you would expect.

So to summarize, whatever you're doing make sure the modal is not being called more than once.

tsql returning a table from a function or store procedure

Use this as a template

-- =============================================
-- Author:      <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
CREATE FUNCTION <Table_Function_Name, sysname, FunctionName> 
    -- Add the parameters for the function here
    <@param1, sysname, @p1> <data_type_for_param1, , int>, 
    <@param2, sysname, @p2> <data_type_for_param2, , char>
<@Table_Variable_Name, sysname, @Table_Var> TABLE 
    -- Add the column definitions for the TABLE variable here
    <Column_1, sysname, c1> <Data_Type_For_Column1, , int>, 
    <Column_2, sysname, c2> <Data_Type_For_Column2, , int>
    -- Fill the table variable with the rows for your result set


That will define your function. Then you would just use it as any other table:

Select * from MyFunction(Param1, Param2, etc.)

Check if value exists in the array (AngularJS)

You could use indexOf function.

if(list.indexOf(createItem.artNr) !== -1) {
  $scope.message = 'artNr already exists!';

More about indexOf:

What difference between the DATE, TIME, DATETIME, and TIMESTAMP Types

Saty described the differences between them. For your practice, you can use datetime in order to keep the output of NOW().

For example:

  OrderId int NOT NULL,
  ProductName varchar(50) NOT NULL,
  OrderDate datetime NOT NULL DEFAULT NOW(),

You can read more at w3schools.

TensorFlow ValueError: Cannot feed value of shape (64, 64, 3) for Tensor u'Placeholder:0', which has shape '(?, 64, 64, 3)'

Powder's comment may go undetected like I missed it so many times,. So with the hope of making it more visible, I will re-iterate his point.

Sometimes using image = array(img).reshape(a,b,c,d) will reshape alright but from experience, my kernel crashes every time I try to use the new dimension in an operation. The safest to use is

np.expand_dims(img, axis=0)

It works perfect every time. I just can't explain why. This link has a great explanation and examples regarding its usage.

A keyboard shortcut to comment/uncomment the select text in Android Studio

To comment/uncomment one line, use: Ctrl + /.

To comment/uncomment a block, use: Ctrl + Shift + /.

What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?

You don't need to specify the module path per se. CMake ships with its own set of built-in find_package scripts, and their location is in the default CMAKE_MODULE_PATH.

The more normal use case for dependent projects that have been CMakeified would be to use CMake's external_project command and then include the Use[Project].cmake file from the subproject. If you just need the Find[Project].cmake script, copy it out of the subproject and into your own project's source code, and then you won't need to augment the CMAKE_MODULE_PATH in order to find the subproject at the system level.

What is the fastest factorial function in JavaScript?

Using ES6 features, can write code on ONE line & without recursion :

var factorial=(n)=>Array.from({length: n},(v, k) => k+1).reduce((a, b) => a*b, 1)

var factorial=(n)=>Array.from(_x000D_
       {length: n}, (v, k) => k+1)   /*Generate Array [1, 2, .., n -1, n]*/_x000D_
       (a, b) => a*b, 1 /*Multiply all aarray items; one with the next*/_x000D_
     ); _x000D_
var n = prompt('Give us "n", we will calculate "n!" ?');_x000D_
if (n) {_x000D_
  alert(`${n}! = ${factorial(n)}`)_x000D_

Extension gd is missing from your system - laravel composer Update

The solution is quite simple.

In your php.ini, just uncomment the line extension=php_gd2.dll (or .so extension for unix systems.)

Hope it helps.

How do I ignore ampersands in a SQL script running from SQL Plus?

I had a CASE statement with WHEN column = 'sometext & more text' THEN ....

I replaced it with WHEN column = 'sometext ' || CHR(38) || ' more text' THEN ...

you could also use WHEN column LIKE 'sometext _ more text' THEN ...

(_ is the wildcard for a single character)

How to set the min and max height or width of a Frame?

A workaround - at least for the minimum size: You can use grid to manage the frames contained in root and make them follow the grid size by setting sticky='nsew'. Then you can use root.grid_rowconfigure and root.grid_columnconfigure to set values for minsize like so:

from tkinter import Frame, Tk

class MyApp():
    def __init__(self):
        self.root = Tk()

        self.my_frame_red = Frame(self.root, bg='red')
        self.my_frame_red.grid(row=0, column=0, sticky='nsew')

        self.my_frame_blue = Frame(self.root, bg='blue')
        self.my_frame_blue.grid(row=0, column=1, sticky='nsew')

        self.root.grid_rowconfigure(0, minsize=200, weight=1)
        self.root.grid_columnconfigure(0, minsize=200, weight=1)
        self.root.grid_columnconfigure(1, weight=1)


if __name__ == '__main__':
    app = MyApp()

But as Brian wrote (in 2010 :D) you can still resize the window to be smaller than the frame if you don't limit its minsize.

Using Bootstrap Modal window as PartialView

Complete and clear example project It displays create, edit and delete entity operation modals with bootstrap and also includes code to handle result returned from those entity operations (c#, JSON, javascript)

bash script read all the files in directory

You can go without the loop:

find /path/to/dir -type f -exec /your/first/command \{\} \; -exec /your/second/command \{\} \; 


Avoid web.config inheritance in child web application using inheritInChildApplications

If (as I understand) you're trying to completely block inheritance in the web config of your child application, I suggest you to avoid using the tag in web.config. Instead create a new apppool and edit the applicationHost.config file (located in %WINDIR%\System32\inetsrv\Config and %WINDIR%\SysWOW64\inetsrv\config). You just have to find the entry for your apppool and add the attribute enableConfigurationOverride="false" like in the following example:

<add name="MyAppPool" autoStart="true" managedRuntimeVersion="v4.0" managedPipelineMode="Integrated" enableConfigurationOverride="false">
    <processModel identityType="NetworkService" />

This will avoid configuration inheritance in the applications served by MyAppPool.


MySQL Trigger: Delete From Table AFTER DELETE

create trigger doct_trigger
after delete on doctor
for each row
delete from patient where patient.PrimaryDoctor_SSN=doctor.SSN ;

flow 2 columns of text automatically with CSS

This solution will split into two columns and divide the content half in one line half in the other. This comes in handy if you are working with data that gets loaded into the first column, and want it to flow evenly every time. :). You can play with the amount that gets put into the first col. This will work with lists as well.


<title>great script for dividing things into cols</title>

    <script type="text/javascript" src=""></script>

var count=$('.firstcol span').length;
var selectedIndex =$('.firstcol span').eq(count/2-1);
var selectIndexafter=selectedIndex.nextAll();

if (count>1)


.secondcol h3 {font-size:18px;font-weight:normal;color:grey}


<div class="firstcol">

<span>1</span><br />
<span>2</span><br />
<span>3</span><br />
<span>4</span><br />
<span>5</span><br />
<span>6</span><br />
<span>7</span><br />
<span>8</span><br />
<span>9</span><br />
<span>10</span><br />
<!--<span>11</span><br />
<span>12</span><br />
<span>13</span><br />
<span>14</span><br />
<span>15</span><br />
<span>16</span><br />
<span>17</span><br />
<span>18</span><br />
<span>19</span><br />
<span>20</span><br />
<span>21</span><br />
<span>22</span><br />
<span>23</span><br />
<span>24</span><br />
<span>25</span><br />-->

<div class="secondcol">




Create a <ul> and fill it based on a passed array

You may also consider the following solution:

let sum = options.set0.concat(options.set1);
const codeHTML = '<ol>' + sum.reduce((html, item) => {
    return html + "<li>" + item + "</li>";
        }, "") + '</ol>';
document.querySelector("#list").innerHTML = codeHTML;

How to view DLL functions?

For native code it's probably best to use Dependency Walker. It also possible to use dumpbin command line utility that comes with Visual Studio.

UICollectionView spacing margins

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {       
         return UIEdgeInsetsMake(7, 10, 5, 10);    

Can't import org.apache.http.HttpResponse in Android Studio

Main build.gradle - /build.gradle

buildscript {
    dependencies {
        classpath '' 
        // Versions:

Module specific build.gradle - /app/build.gradle

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"
    useLibrary 'org.apache.http.legacy'

SQL time difference between two dates result in hh:mm:ss

DECLARE  @StartDate datetime = '10/01/2012 08:40:18.000'
        ,@EndDate   datetime = '10/10/2012 09:52:48.000'
        ,@DaysDifferent int = 0
        ,@Sec BIGINT

select @Sec = DateDiff(s, @StartDate, @EndDate)

IF (DATEDIFF(day, @StartDate, @EndDate) > 0)
        select @DaysDifferent = DATEDIFF(day, @StartDate, @EndDate)
        select @Sec = @Sec - ( @DaysDifferent * 86400 )
        SELECT LTRIM(STR(@DaysDifferent,3)) +'d '+ LTRIM(STR(@Sec/3600, 5)) + ':' + RIGHT('0' + LTRIM(@Sec%3600/60), 2) + ':' + RIGHT('0' + LTRIM(@Sec%60), 2) AS [dd hh:mm:ss]
        SELECT LTRIM(STR(@DaysDifferent,3)) +'d '+ LTRIM(STR(@Sec/3600, 5)) + ':' + RIGHT('0' + LTRIM(@Sec%3600/60), 2) + ':' + RIGHT('0' + LTRIM(@Sec%60), 2) AS [dd hh:mm:ss]

9d 1:12:30

How to properly apply a lambda function into a pandas data frame column

You need mask:

sample['PR'] = sample['PR'].mask(sample['PR'] < 90, np.nan)

Another solution with loc and boolean indexing:

sample.loc[sample['PR'] < 90, 'PR'] = np.nan


import pandas as pd
import numpy as np

sample = pd.DataFrame({'PR':[10,100,40] })
print (sample)
0   10
1  100
2   40

sample['PR'] = sample['PR'].mask(sample['PR'] < 90, np.nan)
print (sample)
0    NaN
1  100.0
2    NaN
sample.loc[sample['PR'] < 90, 'PR'] = np.nan
print (sample)
0    NaN
1  100.0
2    NaN


Solution with apply:

sample['PR'] = sample['PR'].apply(lambda x: np.nan if x < 90 else x)

Timings len(df)=300k:

sample = pd.concat([sample]*100000).reset_index(drop=True)

In [853]: %timeit sample['PR'].apply(lambda x: np.nan if x < 90 else x)
10 loops, best of 3: 102 ms per loop

In [854]: %timeit sample['PR'].mask(sample['PR'] < 90, np.nan)
The slowest run took 4.28 times longer than the fastest. This could mean that an intermediate result is being cached.
100 loops, best of 3: 3.71 ms per loop

JFrame: How to disable window resizing?

You can use a simple call in the constructor under "frame initialization":


After this call, the window will not be resizable.

How to use Oracle ORDER BY and ROWNUM correctly?

The where statement gets executed before the order by. So, your desired query is saying "take the first row and then order it by t_stamp desc". And that is not what you intend.

The subquery method is the proper method for doing this in Oracle.

If you want a version that works in both servers, you can use:

select ril.*
from (select ril.*, row_number() over (order by t_stamp desc) as seqnum
      from raceway_input_labo ril
     ) ril
where seqnum = 1

The outer * will return "1" in the last column. You would need to list the columns individually to avoid this.

Twitter Bootstrap modal on mobile devices

OK this does fix it I tried it today Sept 5-2012 but you have to be sure to check out the demo

The solution by niftylettuce in issue 2130 seems to fix modals in all mobile platforms...

9/1/12 UPDATE: The fix has been updated here: twitter bootstrap jquery plugins

here is the link to the Demo It works great heres the code I used


Indentation Error in Python

Did you maybe use some <tab> instead of spaces?

Try remove all the spaces before the code and readd them using <space> characters, just to be sure it's not a <tab>.

error running apache after xampp install

I got the same error when xampp was installed on windows 10. server certificate does NOT include an ID which matches the server name

So I opened httpd-ssl.conf file in xampp folder and changed the following line



ServerName localhost

And the problem was fixed.

Getting around the Max String size in a vba function?

Couldn't you just have another sub that acts as a caller using module level variable(s) for the arguments you want to pass. For example...

Option Explicit
Public strMsg As String

Sub Scheduler()

    strMsg = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    Application.OnTime Now + TimeValue("00:00:01"), "'Caller'"

End Sub

Sub Caller()

    Call aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa("It Works! " & strMsg)

End Sub

Sub aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(strMessage As String)

    MsgBox strMessage

End Sub

Split bash string by newline characters

There is another way if all you want is the text up to the first line feed:



After that y will contain some and nothing else (no line feed).

What is happening here?

We perform a parameter expansion substring removal (${PARAMETER%PATTERN}) for the shortest match up to the first ANSI C line feed ($'\n') and drop everything that follows (*).

Preview an image before it is uploaded

There are a couple ways you can do this. The most efficient way would be to use URL.createObjectURL() on the File from your <input>. Pass this URL to img.src to tell the browser to load the provided image.

Here's an example:

<input type="file" accept="image/*" onchange="loadFile(event)">_x000D_
<img id="output"/>_x000D_
  var loadFile = function(event) {_x000D_
    var output = document.getElementById('output');_x000D_
    output.src = URL.createObjectURL([0]);_x000D_
    output.onload = function() {_x000D_
      URL.revokeObjectURL(output.src) // free memory_x000D_

You can also use FileReader.readAsDataURL() to parse the file from your <input>. This will create a string in memory containing a base64 representation of the image.

<input type="file" accept="image/*" onchange="loadFile(event)">_x000D_
<img id="output"/>_x000D_
  var loadFile = function(event) {_x000D_
    var reader = new FileReader();_x000D_
    reader.onload = function(){_x000D_
      var output = document.getElementById('output');_x000D_
      output.src = reader.result;_x000D_

What is the cleanest way to get the progress of JQuery ajax request?

jQuery has an AjaxSetup() function that allows you to register global ajax handlers such as beforeSend and complete for all ajax calls as well as allow you to access the xhr object to do the progress that you are looking for

Difference between string object and string literal

The long answer is available here, so I'll give you the short one.

When you do this:

String str = "abc";

You are calling the intern() method on String. This method references an internal pool of String objects. If the String you called intern() on already resides in the pool, then a reference to that String is assigned to str. If not, then the new String is placed in the pool, and a reference to it is then assigned to str.

Given the following code:

String str = "abc";
String str2 = "abc";
boolean identity = str == str2;

When you check for object identity by doing == (you are literally asking: do these two references point to the same object?), you get true.

However, you don't need to intern() Strings. You can force the creation on a new Object on the Heap by doing this:

String str = new String("abc");
String str2 = new String("abc");
boolean identity = str == str2;

In this instance, str and str2 are references to different Objects, neither of which have been interned, so that when you test for Object identity using ==, you will get false.

In terms of good coding practice: do not use == to check for String equality, use .equals() instead.

Prevent BODY from scrolling when a modal is opened

I found a working solution after doing some 8-10 hours research on StackOverflow itself.

The breakthrough


So I have built a function to check if any modal is open which will periodically add class *modal-open** to the



The reason to use $(".modal") here is because all modals (in Bootstrap) use class modal (fade/show is as per the state)

So my modals are now running perfectly without the body getting scrolled.

This is a bug/unheard issue in GitHub as well but nobody's bothered.

VBA Excel Provide current Date in Text box

Set the value from code on showing the form, not in the design-timeProperties for the text box.

Private Sub UserForm_Activate()
    Me.txtDate.Value = Format(Date, "mm/dd/yy")
End Sub

How to print a list in Python "nicely"

As the other answers suggest pprint module does the trick.
Nonetheless, in case of debugging where you might need to put the entire list into some log file, one might have to use pformat method along with module logging along with pprint.

import logging
from pprint import pformat

logger = logging.getLogger('newlogger')
handler = logging.FileHandler('newlogger.log')

formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')


data = [ (i, { '1':'one',
         for i in xrange(3)


And if you need to directly log it to a File, one would have to specify an output stream, using the stream keyword. Ref

from pprint import pprint

with open('output.txt', 'wt') as out:
   pprint(myTree, stream=out)

See Stefano Sanfilippo's answer

API Gateway CORS: no 'Access-Control-Allow-Origin' header

I found a simple solution within

API Gateway > Select your API endpoint > Select the method (in my case it was the POST)

Now there is a dropdown ACTIONS > Enable CORS .. select it.

Now select the dropdown ACTIONS again > Deploy API (re-deploy it)

enter image description here

It worked !

What are the uses of "using" in C#?

In conclusion, when you use a local variable of a type that implements IDisposable, always, without exception, use using1.

If you use nonlocal IDisposable variables, then always implement the IDisposable pattern.

Two simple rules, no exception1. Preventing resource leaks otherwise is a real pain in the *ss.

1): The only exception is – when you're handling exceptions. It might then be less code to call Dispose explicitly in the finally block.

Attributes / member variables in interfaces?

Java 8 introduced default methods for interfaces using which you can body to the methods. According to OOPs interfaces should act as contract between two systems/parties.

But still i found a way to achieve storing properties in the interface. I admit it is kinda ugly implementation.

   import java.util.Map;
   import java.util.WeakHashMap;

interface Rectangle

class Storage
    private static final Map<Rectangle, Integer> heightMap = new WeakHashMap<>();
    private static final Map<Rectangle, Integer> widthMap = new WeakHashMap<>();

default public int getHeight()
    return Storage.heightMap.get(this);

default public int getWidth()
    return Storage.widthMap.get(this);

default public void setHeight(int height)
    Storage.heightMap.put(this, height);

default public void setWidth(int width)
    Storage.widthMap.put(this, width);

This interface is ugly. For storing simple property it needed two hashmaps and each hashmap by default creates 16 entries by default. Additionally when real object is dereferenced JVM additionally need to remove this weak reference.

Download Excel file via AJAX MVC

    global: false,
    url: SitePath + "/User/ExportTeamMembersInExcel",
    "data": { 'UserName': UserName, 'RoleId': RoleId, UserIds: AppraseeId },
    "type": "POST",
    "dataType": "JSON",
   "success": function (result) {
        var bytes = new Uint8Array(result.FileContents);
        var blob = new Blob([bytes], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
        var link = document.createElement('a');
        link.href = window.URL.createObjectURL(blob); = "myFileName.xlsx";;
    "error": function () {

    public JsonResult ExportTeamMembersInExcel(string UserName, long? RoleId, string[] UserIds)
        MemoryStream stream = new MemoryStream();
        FileContentResult robj;
        DataTable data = objuserservice.ExportTeamToExcel(UserName, RoleId, UserIds);
        using (XLWorkbook wb = new XLWorkbook())
            wb.Worksheets.Add(data, "TeamMembers");
            using (stream)
        robj = File(stream.ToArray(), System.Net.Mime.MediaTypeNames.Application.Octet, "TeamMembers.xlsx");
        return Json(robj, JsonRequestBehavior.AllowGet);

Load dimension value from res/values/dimension.xml from source code

If you just want to change the size font dynamically then you can:

textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, resources.getDimension(R.dimen.tutorial_cross_marginTop))

As @achie's answer, you can get the dp from dimens.xml like this:

val dpValue = (resources.getDimension(R.dimen.tutorial_cross_marginTop)/ resources.displayMetrics.density).toInt()

or get sp like this

val spValue = (resources.getDimension(R.dimen.font_size)/ resources.displayMetrics.scaledDensity).toInt()

About #{getDimension}

     * Retrieve a dimensional for a particular resource ID.  Unit 
     * conversions are based on the current {@link DisplayMetrics} associated
     * with the resources.
     * @param id The desired resource identifier, as generated by the aapt
     *           tool. This integer encodes the package, type, and resource
     *           entry. The value 0 is an invalid identifier.
     * @return Resource dimension value multiplied by the appropriate 
     * metric.
     * @throws NotFoundException Throws NotFoundException if the given ID does not exist.
     * @see #getDimensionPixelOffset
     * @see #getDimensionPixelSize

Resource dimension value multiplied by the appropriate

Javascript: formatting a rounded number to N decimals

PHP-Like rounding Method

The code below can be used to add your own version of Math.round to your own namespace which takes a precision parameter. Unlike Decimal rounding in the example above, this performs no conversion to and from strings, and the precision parameter works same way as PHP and Excel whereby a positive 1 would round to 1 decimal place and -1 would round to the tens.

var myNamespace = {};
myNamespace.round = function(number, precision) {
    var factor = Math.pow(10, precision);
    var tempNumber = number * factor;
    var roundedTempNumber = Math.round(tempNumber);
    return roundedTempNumber / factor;

myNamespace.round(1234.5678, 1); // 1234.6
myNamespace.round(1234.5678, -1); // 1230

from Mozilla Developer reference for Math.round()

How to detect when an @Input() value changes in Angular?

You can also , have an observable which triggers on changes in the parent component(CategoryComponent) and do what you want to do in the subscribtion in the child component. (videoListComponent)


public categoryChange$ : ReplaySubject<any> = new ReplaySubject(1);


public onCategoryChange(): void {


public ngOnInit(): void {
  service.categoryChange$.subscribe(() => {
   // do your logic

List all sequences in a Postgres db 8.1 with SQL

Kind of a hack, but try this:

select 'select ''' || relname || ''' as sequence, last_value from ' || relname || ' union' FROM pg_catalog.pg_class c WHERE c.relkind IN ('S','');

Remove the last UNION and execute the result

Python SQL query string formatting

you could put the field names into an array "fields", and then:

sql = 'select %s from table where condition1=1 and condition2=2' % (
 ', '.join(fields))

SUM of grouped COUNT in SQL Query

You can use ROLLUP

select nvl(name, 'SUM'), count(*)
from table
group by rollup(name)

Is there a Mutex in Java?

See this page:

It has a slightly different pattern which is (I think) what you are looking for:

try {
  try {
    // do something
  } finally {
} catch(InterruptedException ie) {
  // ...

In this usage, you're only calling release() after a successful acquire()

How do shift operators work in Java?

System.out.println(Integer.toBinaryString(2 << 11)); 

Shifts binary 2(10) by 11 times to the left. Hence: 1000000000000

System.out.println(Integer.toBinaryString(2 << 22)); 

Shifts binary 2(10) by 22 times to the left. Hence : 100000000000000000000000

System.out.println(Integer.toBinaryString(2 << 33)); 

Now, int is of 4 bytes,hence 32 bits. So when you do shift by 33, it's equivalent to shift by 1. Hence : 100

Remove all special characters, punctuation and spaces from string

The most generic approach is using the 'categories' of the unicodedata table which classifies every single character. E.g. the following code filters only printable characters based on their category:

import unicodedata
# strip of crap characters (based on the Unicode database
# categorization:

PRINTABLE = set(('Lu', 'Ll', 'Nd', 'Zs'))

def filter_non_printable(s):
    result = []
    ws_last = False
    for c in s:
        c = unicodedata.category(c) in PRINTABLE and c or u'#'
    return u''.join(result).replace(u'#', u' ')

Look at the given URL above for all related categories. You also can of course filter by the punctuation categories.

Are HTTPS URLs encrypted?

Althought there are some good answers already here, most of them are focusing in browser navigation. I'm writing this in 2018 and probably someone wants to know about the security of mobile apps.

For mobile apps, if you control both ends of the application (server and app), as long as you use HTTPS you're secure. iOS or Android will verify the certificate and mitigate possible MiM attacks (that would be the only weak point in all this). You can send sensitive data through HTTPS connections that it will be encrypted during transport. Just your app and the server will know any parameters sent through https.

The only "maybe" here would be if client or server are infected with malicious software that can see the data before it is wrapped in https. But if someone is infected with this kind of software, they will have access to the data, no matter what you use to transport it.

Write variable to a file in Ansible

Based on Ramon's answer I run into an error. The problem where spaces in the JSON I tried to write I got it fixed by changing the task in the playbook to look like:

- copy:
    content: "{{ your_json_feed }}"
    dest: "/path/to/destination/file"

As of now I am not sure why this was needed. My best guess is that it had something to do with how variables are replaced in Ansible and the resulting file is parsed.

git: patch does not apply

In my case I was stupid enough to create the patch file incorrectly in the first place, actually diff-ing the wrong way. I ended up with the exact same error messages.

If you're on master and do git diff branch-name > branch-name.patch, this tries to remove all additions you want to happen and vice versa (which was impossible for git to accomplish since, obviously, never done additions cannot be removed).

So make sure you checkout to your branch and execute git diff master > branch-name.patch

How to detect duplicate values in PHP array?

To get rid use array_unique(). To detect if have any use count(array_unique()) and compare to count($array).

How do I auto size columns through the Excel interop objects?

This might be too late but if you add




it also works.

Show dialog from fragment?

For me, it was the following-


public class MyFragment extends Fragment implements MyDialog.Callback
    ShowDialog activity_showDialog;

    public void onAttach(Activity activity)
            activity_showDialog = (ShowDialog)activity;
        catch(ClassCastException e)
            Log.e(this.getClass().getSimpleName(), "ShowDialog interface needs to be     implemented by Activity.", e);
            throw e;

    public void onClick(View view) 
        MyDialog dialog = new MyDialog();
        dialog.setTargetFragment(this, 1); //request code

    public void accept()

    public void decline()

    public void cancel()



public class MyDialog extends DialogFragment implements View.OnClickListener
    private EditText mEditText;
    private Button acceptButton;
    private Button rejectButton;
    private Button cancelButton;

    public static interface Callback
        public void accept();
        public void decline();
        public void cancel();

    public MyDialog()
        // Empty constructor required for DialogFragment

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        View view = inflater.inflate(R.layout.dialogfragment, container);
        acceptButton = (Button) view.findViewById(;
        rejectButton = (Button) view.findViewById(;
        cancelButton = (Button) view.findViewById(;
        return view;

    public void onClick(View v)
        Callback callback = null;
            callback = (Callback) getTargetFragment();
        catch (ClassCastException e)
            Log.e(this.getClass().getSimpleName(), "Callback of this class must be implemented by target fragment!", e);
            throw e;

        if (callback != null)
            if (v == acceptButton)
            else if (v == rejectButton)
            else if (v == cancelButton)


public class MyActivity extends ActionBarActivity implements ShowDialog

    public void showDialog(DialogFragment dialogFragment)
        FragmentManager fragmentManager = getSupportFragmentManager();, "dialog");

DialogFragment layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android=""
    android:orientation="vertical" >



        android:text="@string/decline" />

        android:text="@string/cancel" />

        android:text=" " />

As the name dialogfragment_heightfixhiddenbtn shows, I just couldn't figure out a way to fix that the bottom button's height was cut in half despite saying wrap_content, so I added a hidden button to be "cut" in half instead. Sorry for the hack.

Get value of multiselect box using jQuery or pure JS

You could do like this too.

<form action="ResultsDulith.php" id="intermediate" name="inputMachine[]" multiple="multiple" method="post">
    <select id="selectDuration" name="selectDuration[]" multiple="multiple"> 
        <option value="1 WEEK" >Last 1 Week</option>
        <option value="2 WEEK" >Last 2 Week </option>
        <option value="3 WEEK" >Last 3 Week</option>
         <option value="4 WEEK" >Last 4 Week</option>
          <option value="5 WEEK" >Last 5 Week</option>
           <option value="6 WEEK" >Last 6 Week</option>
     <input type="submit"/> 

Then take the multiple selection from following PHP code below. It print the selected multiple values accordingly.



How do I drop a MongoDB database from the command line?

You don't need heredocs or eval, mongo itself can act as an interpreter.

#!/usr/bin/env mongo
var db = new Mongo().getDB("someDatabase");

Make the file executable and run it.

Delete certain lines in a txt file via a batch file

Use the following:

type file.txt | findstr /v ERROR | findstr /v REFERENCE

This has the advantage of using standard tools in the Windows OS, rather than having to find and install sed/awk/perl and such.

See the following transcript for it in operation:

C:\>type file.txt
Good Line of data
bad line of C:\Directory\ERROR\myFile.dll
Another good line of data
bad line: REFERENCE
Good line

C:\>type file.txt | findstr /v ERROR | findstr /v REFERENCE
Good Line of data
Another good line of data
Good line

how to split the ng-repeat data with three columns using bootstrap

Here's an easy-hacky way of doing it. It's more manual and ends up with messy markup. I do not recommend this, but there are situations where this might be useful.

Here's a fiddle link


<div ng-controller="myController">
    <div class="row">
        <div class="col-sm-4">
            <div class="well">
                <div ng-repeat="person in people = data | limitTo:Math.ceil(data.length/3)">
                {{ }}
        <div class="col-sm-4">
            <div class="well">
                <div ng-repeat="person in people = data | limitTo:Math.ceil(data.length/3):Math.ceil(data.length/3)">
                {{ }}
        <div class="col-sm-4">
            <div class="well">
                <div ng-repeat="person in people = data | limitTo:Math.ceil(data.length/3):Math.ceil(data.length/3)*2">
                {{ }}


var app = angular.module('myApp', []);

app.controller('myController', function($scope) {

    $scope.Math = Math;
    $ = [
        {"name":"Person A"},

This setup requires us to use some Math on the markup :/, so you'll need to inject Math by adding this line: $scope.Math = Math;

adb shell command to make Android package uninstall dialog appear

Running the @neverever415 answer I got:


In this case check that you wrote a right package name, maybe it is a debug version like com.package_name.debug:

adb shell pm uninstall com.package_name.debug

Or see

Remove duplicates from an array of objects in JavaScript

If you want to de-duplicate your array based on all arguments and not just one. You can use the uniqBy function of lodash that can take a function as a second argument.

You will have this one-liner:

 _.uniqBy(array, e => { return && })

Case insensitive string as HashMap key

Because of this, I'm creating a new object of CaseInsensitiveString for every event. So, it might hit performance.

Creating wrappers or converting key to lower case before lookup both create new objects. Writing your own java.util.Map implementation is the only way to avoid this. It's not too hard, and IMO is worth it. I found the following hash function to work pretty well, up to few hundred keys.

static int ciHashCode(String string)
    // length and the low 5 bits of hashCode() are case insensitive
    return (string.hashCode() & 0x1f)*33 + string.length();

How to get scrollbar position with Javascript?

I did this for a <div> on Chrome.

element.scrollTop - is the pixels hidden in top due to the scroll. With no scroll its value is 0.

element.scrollHeight - is the pixels of the whole div.

element.clientHeight - is the pixels that you see in your browser.

var a = element.scrollTop;

will be the position.

var b = element.scrollHeight - element.clientHeight;

will be the maximum value for scrollTop.

var c = a / b;

will be the percent of scroll [from 0 to 1].

Windows 7 - 'make' is not recognized as an internal or external command, operable program or batch file

If you already have MinGW installed in Windows 7, just simply do the following:

  1. Make another copy of C:\MinGW\bin\mingw32-make.exe file in the same folder.
  2. Rename the file name from mingw32-make.exe to make.exe.
  3. Run make command again.

Tested working in my laptop for above steps.

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 doesn't change at all. Therefore the change for people accessing via the IP bound to (and CNAME'd by you) will see the change as soon as the VIP swap is complete.

ReferenceError: fetch is not defined

Best one is Axios library for fetching. use npm i --save axios for installng and use it like fetch, just write axios instead of fetch and then get response in then().

How to refresh Gridview after pressed a button in

Before data bind change gridview databinding method, assign GridView.EditIndex to -1. It solved the same issue for me :

 gvTypes.EditIndex = -1;

gvTypes is my GridView ID.

Convert generic List/Enumerable to DataTable?

This is the simple Console Application to convert List to Datatable.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.ComponentModel;

namespace ConvertListToDataTable
    public static class Program
        public static void Main(string[] args)
            List<MyObject> list = new List<MyObject>();
            for (int i = 0; i < 5; i++)
                list.Add(new MyObject { Sno = i, Name = i.ToString() + "-KarthiK", Dat = DateTime.Now.AddSeconds(i) });

            DataTable dt = ConvertListToDataTable(list);
            foreach (DataRow row in dt.Rows)
                for (int x = 0; x < dt.Columns.Count; x++)
                    Console.Write(row[x].ToString() + " ");

        public class MyObject
            public int Sno { get; set; }
            public string Name { get; set; }
            public DateTime Dat { get; set; }

        public static DataTable ConvertListToDataTable<T>(this List<T> iList)
            DataTable dataTable = new DataTable();
            PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));
            for (int i = 0; i < props.Count; i++)
                PropertyDescriptor propertyDescriptor = props[i];
                Type type = propertyDescriptor.PropertyType;

                if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                    type = Nullable.GetUnderlyingType(type);

                dataTable.Columns.Add(propertyDescriptor.Name, type);
            object[] values = new object[props.Count];
            foreach (T iListItem in iList)
                for (int i = 0; i < values.Length; i++)
                    values[i] = props[i].GetValue(iListItem);
            return dataTable;

Hide keyboard in react-native

Keyboard module is used to control keyboard events.

  • import { Keyboard } from 'react-native'
  • Add below code in render method.

    render() { return <TextInput onSubmitEditing={Keyboard.dismiss} />; }

You can use -


static dismiss() Dismisses the active keyboard and removes focus as per react native documents.

List file using ls command in Linux with full path

For listing everything with full path, only in current directory

find $PWD -maxdepth 1

Same as above but only matches a particular extension, case insensitive (.sh files in this case)

find $PWD -maxdepth 1 -iregex '.+\.sh'

$PWD is for current directory, it can be replaced with any directory

mydir="/etc/sudoers.d/" ; find $mydir -maxdepth 1

maxdepth prevents find from going into subdirectories, for example you can set it to "2" for listing items in children as well. Simply remove it if you need it recursive.

To limit it to only files, can use -type f option.

find $PWD -maxdepth 1 -type f

Why is SQL server throwing this error: Cannot insert the value NULL into column 'id'?

use IDENTITY(1,1) while creating the table eg

[Id]     [int]  IDENTITY(1,1) NOT NULL,
[Status] [smallint] NOT NULL,

    [Id] ASC

How do I get the current date and current time only respectively in Django?

For the date, you can use or

For the time, you can use

However, why have separate fields for these in the first place? Why not use a single DateTimeField?

You can always define helper functions on the model that return the .date() or .time() later if you only want one or the other.

How to remove anaconda from windows completely?

Go to C:\Users\username\Anaconda3 and search for Uninstall-Anaconda3.exe which will remove all the components of Anaconda.

Error: JAVA_HOME is not defined correctly executing maven

This solution work for me... just type export PATH=$JAVA_HOME/jre/bin:$PATH in the terminal then run mvn -version it will show the same error but with a log like this

which: no javac in (/jre/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/puppetlabs/bin)
Warning: JAVA_HOME environment variable is not set.
Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T22:59:23+05:30)
Maven home: /opt/apache-maven-3.2.5
Java version: 1.8.0_171, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-693.el7.x86_64", arch: "amd64", family: "unix"

now copy the Java home path i.e. /usr/lib/jvm/java-1.8.0-openjdk- in my case.

now type,

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-

and the error gets resolve. NOTE: paste your own path which is shown by your machine in mvn log at export JAVA_HOME.

How to run docker-compose up -d at system start up?

Use restart: always in your docker compose file.

Docker-compose up -d will launch container from images again. Use docker-compose start to start the stopped containers, it never launches new containers from images.

    restart: always   
    image: nginx   
      - "80:80"
      - "443:443"   links:
      - other_container:other_container

Also you can write the code up in the docker file so that it gets created first, if it has the dependency of other containers.

Nested routes with react router v4 / v5

react-router v6

Update for 2021

The upcoming v6 will have nested Route components that Just Work™

See example code in this blog post

The question is about v4/v5, but when v6 ships the correct answer will be just use that if you can.

react-router v4 & v5

It's true that in order to nest Routes you need to place them in the child component of the Route.

However if you prefer a more inline syntax rather than breaking your Routes up across components, you can provide a functional component to the render prop of the Route you want to nest under.


  <Route path="/" component={Frontpage} exact />
  <Route path="/home" component={HomePage} />
  <Route path="/about" component={AboutPage} />

    render={({ match: { url } }) => (
        <Route path={`${url}/`} component={Backend} exact />
        <Route path={`${url}/home`} component={Dashboard} />
        <Route path={`${url}/users`} component={UserPage} />


If you're interested in why the render prop should be used, and not the component prop, it's because it stops the inline functional component from being remounted on every render. See the documentation for more detail.

Note that the example wraps the nested Routes in a Fragment. Prior to React 16, you can use a container <div> instead.

SQL Server 2005 Using CHARINDEX() To split a string

DECLARE @variable VARCHAR(100) = 'LD-23DSP-1430';
WITH    Split
      AS ( SELECT   @variable AS list ,
                    charone = LEFT(@variable, 1) ,
                    R = RIGHT(@variable, LEN(@variable) - 1) ,
                    'A' AS MasterOne
           UNION ALL
           SELECT   Split.list ,
                    LEFT(Split.R, 1) ,
                    R = RIGHT(split.R, LEN(Split.R) - 1) ,
                    'B' AS MasterOne
           FROM     Split
           WHERE    LEN(Split.R) > 0
FROM    Split

Overflow Scroll css is not working in the div

I edited your: Fiddle

html, body{ margin:0; padding:0; overflow:hidden; height:100% }
.header { margin: 0 auto; width:500px; height:30px; background-color:#dadada;}
.wrapper{ margin: 0 auto; width:500px; overflow:scroll; height: 100%;}

Giving the html-tag a 100% height is the solution. I also deleted the container div. You don't need it when your layout stays like this.

IE Driver download location Link for Selenium

Use the below link to download IE Driver latest version

IE Driver

How to detect the screen resolution with JavaScript?

var width = screen.width;
var height = screen.height;

Change the background color of a row in a JTable

The call to getTableCellRendererComponent(...) includes the value of the cell for which a renderer is sought.

You can use that value to compute a color. If you're also using an AbstractTableModel, you can provide a value of arbitrary type to your renderer.

Once you have a color, you can setBackground() on the component that you're returning.

jQuery, checkboxes and .is(":checked")

I'm still experiencing this behavior with jQuery 1.7.2. A simple workaround is to defer the execution of the click handler with setTimeout and let the browser do its magic in the meantime:

$("#myCheckbox").click( function() {
    var that = this;

Xcode Objective-C | iOS: delay function / NSTimer help?

[NSTimer scheduledTimerWithTimeInterval:.06 target:self selector:@selector(goToSecondButton:) userInfo:nil repeats:NO];

Is the best one to use. Using sleep(15); will cause the user unable to perform any other actions. With the following function, you would replace goToSecondButton with the appropriate selector or command, which can also be from the frameworks.

Getting request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource

Basically, to make a cross domain AJAX requests, the requested server should allow the cross origin sharing of resources (CORS). You can read more about that from here:

In your scenario, you are setting the headers in the client which in fact needs to be set into http://localhost:8080/app server side code.

If you are using PHP Apache server, then you will need to add following in your .htaccess file:

Header set Access-Control-Allow-Origin "*"

How to detect running app using ADB command

Alternatively, you could go with pgrep or Process Grep. (Busybox is needed)

You could do a adb shell pgrep and it would display just the process Id.

As a suggestion, since Android is Linux, you can use most basic Linux commands with adb shell to navigate/control around. :D

Send HTTP GET request with header

You do it exactly as you showed with this line:

get.setHeader("Content-Type", "application/x-zip");

So your header is fine and the problem is some other input to the web service. You'll want to debug that on the server side.