This application has no explicit mapping for error

Question

I used maven to do the tutorial https   spring io guides gs uploading-files  All the codes I used was copied   The Application can run  but I get the error      Whitelabel Error Page This application has no explicit mapping for  error  so you are seeing this as a fallback     Tue Jun 30 17 24 02 CST 2015 There was an unexpected error  type Not Found  status 404      No message available   How can I fix it

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It sometime happen when your spring app not able to find the spring component and it's not get initialised in sprint container you can add component using @ComponentScan along with your @SpringBootApplication like below example

@SpringBootApplication
@ComponentScan({"model", "service"})
class MovreviewApplication {

                public static void main(String[] args) {
        SpringApplication.run(MovreviewApplication.class, args);

}

in above example model and service are the packages in my app.

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I was facing the same problem  using gradle and it got solved on adding following dependencies-  compile  org springframework boot spring-boot-starter-data-jpa   compile  org springframework boot spring-boot-starter-web   testCompile  org springframework boot spring-boot-starter-test   compile  org apache tomcat embed tomcat-embed-jasper     earlier I was missing the last one causing the same error

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Ensure that you have jasper and jstl in the list of dependencies    x000D   x000D   lt dependency gt  x000D       lt groupId gt org apache tomcat embed lt  groupId gt  x000D       lt artifactId gt tomcat-embed-jasper lt  artifactId gt  x000D       lt scope gt provided lt  scope gt  x000D   lt  dependency gt  x000D   lt dependency gt  x000D       lt groupId gt javax servlet lt  groupId gt  x000D       lt artifactId gt jstl lt  artifactId gt  x000D   lt  dependency gt  x000D   x000D   x000D    Here is a working starter project - https   github com spring-projects spring-boot tree master spring-boot-samples spring-boot-sample-web-jsp  Author  Biju Kunjummen

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this can happen if you forget the  RestController annotation on top of your controller class  import import org springframework web bind annotation RestController   and add the annotation as below   refer the simple example below   import org springframework web bind annotation RestController  import org springframework web bind annotation RequestMapping     RestController public class HelloController    RequestMapping          public String index             return  Greetings from Spring Boot

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The tutorial expects you to have the Thymeleaf template engine in classpath  I ran into the same problem and finally figured this out  I ll reach out to the tutorial author to include that info   The easiest way if you ve followed the tutorial is to add the dependency to your pom xml in the project root folder  Next time you run your app Spring will detect Thymeleaf and use the uploadform template   lt dependency gt     lt groupId gt org springframework boot lt  groupId gt     lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   lt  dependency gt    For the full example see their Github repository

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Make sure your Main class should be on top of your controllers  In case of the following example   Main class containing    SpringBootApplication public class Main       public static void main String   args            SpringApplication run Main class  args             EmployeeController class containing    RestController public class EmployeeController        InitBinder     public void setAllowedFields WebDataBinder dataBinder            dataBinder setDisallowedFields  id                RequestMapping value     employee save   method   RequestMethod GET      public String save            Employee newEmp   new Employee            newEmp setAge 25           newEmp setFirstName  Pikachu            newEmp setId 100           return  Name      newEmp getFirstName        Age      newEmp getAge        Id       newEmp getId              If your main class is in the root folder  just like this path   projectname  src main java main then make sure your controllers below your Main class  For example  projectname  src main java main controllers

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You can solve this by adding an ErrorController in your application  You can have the error controller return a view that you need    Error Controller in my application looks like below   import org springframework boot autoconfigure web ErrorAttributes  import org springframework boot autoconfigure web ErrorController  import org springframework http HttpStatus  import org springframework http ResponseEntity  import org springframework stereotype Controller  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation ResponseBody  import org springframework web context request RequestAttributes  import org springframework web context request ServletRequestAttributes  import org springframework web servlet ModelAndView   import javax servlet http HttpServletRequest  import java util Map          Basic Controller which is called for unhandled errors      Controller public class AppErrorController implements ErrorController                  Error Attributes in the Application             private ErrorAttributes errorAttributes       private final static String ERROR PATH     error                   Controller for the Error Controller         param errorAttributes             public AppErrorController ErrorAttributes errorAttributes            this errorAttributes   errorAttributes                        Supports the HTML Error View         param request         return              RequestMapping value   ERROR PATH  produces    text html       public ModelAndView errorHtml HttpServletRequest request            return new ModelAndView   errors error   getErrorAttributes request  false                          Supports other formats like JSON  XML         param request         return              RequestMapping value   ERROR PATH       ResponseBody     public ResponseEntity lt Map lt String  Object gt  gt  error HttpServletRequest request            Map lt String  Object gt  body   getErrorAttributes request  getTraceParameter request            HttpStatus status   getStatus request           return new ResponseEntity lt Map lt String  Object gt  gt  body  status                         Returns the path of the error page                 return the error path              Override     public String getErrorPath             return ERROR PATH              private boolean getTraceParameter HttpServletRequest request            String parameter   request getParameter  trace            if  parameter    null                return false                    return   false  equals parameter toLowerCase                private Map lt String  Object gt  getErrorAttributes HttpServletRequest request                                                     boolean includeStackTrace            RequestAttributes requestAttributes   new ServletRequestAttributes request           return this errorAttributes getErrorAttributes requestAttributes                  includeStackTrace              private HttpStatus getStatus HttpServletRequest request            Integer statusCode    Integer  request                  getAttribute  javax servlet error status code            if  statusCode    null                try                   return HttpStatus valueOf statusCode                             catch  Exception ex                                    return HttpStatus INTERNAL SERVER ERROR            The above class is based on Springs BasicErrorController class   You can instantiate the above ErrorController like this in a  Configuration file     Autowired  private ErrorAttributes errorAttributes     Bean  public AppErrorController appErrorController   return new AppErrorController errorAttributes      You can choose override the default ErrorAttributes by implementing ErrorAttributes  But in most cases the DefaultErrorAttributes should suffice

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This happens when an explicit error page is not defined  To define an error page  create a mapping of  error with a view  e g  the below code maps to a string value being returned in case of an error   package com rumango controller   import org springframework boot web servlet error ErrorController  import org springframework stereotype Controller  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation ResponseBody   Controller public class IndexController implements ErrorController      private final static String PATH     error        Override      RequestMapping PATH       ResponseBody     public String getErrorPath                TODO Auto-generated method stub         return  No Mapping Found

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Change  Controller to  RestController in your controller class and everything should go smoothly

User · Answer

Make sure  RestController annotation is added right after the  SpringBootApplication  RestController annotation tells Spring that this code describes an endpoint that should be made available over the web

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All I have done to solve this kind of problem is to mention anotation  Configuration in MVCConfig Class    Like this one    package com example          Created by sartika s hasibuan on 1 10 2017      import org springframework boot autoconfigure EnableAutoConfiguration  import org springframework context annotation ComponentScan  import org springframework context annotation Configuration  import org springframework web servlet config annotation ViewControllerRegistry  import org springframework web servlet config annotation WebMvcConfigurerAdapter    EnableAutoConfiguration  Configuration  ComponentScan public class MvcConfig extends WebMvcConfigurerAdapter         Override     public void addViewControllers ViewControllerRegistry registry            registry addViewController   home   setViewName  home            registry addViewController      setViewName  home            registry addViewController   hello   setViewName  hello            registry addViewController   login   setViewName  login

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Make sure that your main class is in a root package above other classes   When you run a Spring Boot Application   i e  a class annotated with  SpringBootApplication   Spring will only scan the classes below your main class package   com     - APP           - Application java   lt --- your main class should be here  above your controller classes                      - model               - user java           - controller               - UserController java

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I had a similar mistake  I use the spring boot and velocity  my solution is to check the file application properties  spring velocity toolbox-config-location found that this property is wrong

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You have to organize the packages so that the package containing public static main or where you wrote  SpringBootApplication   the father of all your other packages

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If you have annotated the interface with requestMapping  make sure you also annotate the Class which implements the interface with  Component

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In my case the controller class was annotated with  Controller  Changing that to  RestController resolved the problem   Basically  RestController is  Controller    ResponseBody So either use  RestController   or  Controller with  ResponseBody annotation with each method   Some useful notes here   https   www genuitec com spring-frameworkrestcontroller-vs-controller

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I added this dependency and it solved my problem    lt dependency gt       lt groupId gt org springframework boot lt  groupId gt        lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   lt  dependency gt

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Quite late to the party  As per spring official documentation  Spring Boot installs a whitelabel error page that you see in a browser client if you encounter a server error   https   docs spring io spring-boot docs current reference htmlsingle  howto-customize-the-whitelabel-error-page   You can disable the feature by setting server error whitelabel enabled false in application yml or application properties file    2 Recommended way is set your error page so that end user can understand  Under resources templates folder create a error html file and add dependency in pom xml file      lt dependency gt   lt groupId gt org springframework boot lt  groupId gt   lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   lt  dependency gt    Spring will automatically choose the error html page as the default error template  Note - Don t forget to update maven project after adding dependency

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I am developing Spring Boot application for a few weeks   And i was gettig same error like below       Whitelabel Error Page   This application has no explicit mapping for  error  so you are seeing this as a fallback    Thu Jan 18 14 12 11 AST 2018   There was an unexpected error  type Not Found  status 404     No message available   When i get this error massage i realized my controller or rest controller class is note defined in my project  I mean our all controller packages aren t same package with main class which include  SpringBootApplication annotation   I mean you need to add you controller package s name to  ComponentScan annotation to your main class which is inludes  SpringBootApplication annotation If you write codes of below your problem will be solving    Most important thing is you have to add your all controller s package to  ComponentScan annotation like i did in the below  package com example demo   import org springframework boot SpringApplication  import org springframework boot autoconfigure SpringBootApplication  import org springframework context annotation ComponentScan    SpringBootApplication  ComponentScan    com controller package1  com controller package2  com controller package3  com controller packageN    controller    service       If our Controller class or Service class is not in the same packages we have   to add packages s name like this   directory package  with main class public class MainApp       public static void main String   args            SpringApplication run MainApp class  args             I hope this codes are going to help someone     If you find another way to solve this error or you have some suggestions for me  please write to comments    thanks

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

User · Answer

In tutorial  the controller is annotated with  Controller which is used to to create a Map of model object and find a view but  RestController simply return the object and object data is directly written into HTTP response as JSON or XML  If you want to view response  use  RestController or use  ResponseBody as well with  Controller    Controller  ResponseBody   Read more  https   javarevisited blogspot com 2017 08 difference-between-restcontroller-and-controller-annotations-spring-mvc-rest html ixzz5WtrMSJHJ

User · Answer

Try adding the dependency    lt dependency gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   lt  dependency gt

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When we create a Spring boot application we annotate it with  SpringBootApplication annotation  This annotation  wraps up  many other necessary annotations for the application to work  One such annotation is  ComponentScan annotation  This annotation tells Spring to look for Spring components and configure the application to run   Your application class needs to be top of your package hierarchy  so that Spring can scan sub-packages and find out the other required components   package com test spring boot  import org springframework boot SpringApplication  import org springframework boot autoconfigure SpringBootApplication    SpringBootApplication public class App       public static void main String   args            SpringApplication run App class  args             Below code snippet works as the controller package is under com test spring boot package  package com test spring boot controller   import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RestController    RestController public class HomeController         RequestMapping          public String home            return  Hello World              Below code snippet  does NOT Work as the controller package is NOT under com test spring boot package  package com test controller   import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RestController    RestController public class HomeController          RequestMapping           public String home             return  Hello World                From Spring Boot documentation      Many Spring Boot developers always have their main class annotated   with  Configuration   EnableAutoConfiguration and  ComponentScan    Since these annotations are so frequently used together  especially if   you follow the best practices above   Spring Boot provides a   convenient  SpringBootApplication alternative       The  SpringBootApplication annotation is equivalent to using    Configuration   EnableAutoConfiguration and  ComponentScan with their   default attributes

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In your java file   say  Viper java  having main class add    RestController  and  RequestMapping        SpringBootApplication  RestController public class Viper       RequestMapping          public String home              return  This is what i was looking for                                 public static void main  String   args       SpringApplication run Viper class   args

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Using Spring Boot and application properties file I had to change a structure of my project  JSP files should to be in this location   src main resources META-INF resources WEB-INF jsp  After this change my project works  I ve found solution here  https   www logicbig com tutorials spring-framework spring-boot boot-serve-dynamic html

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In the main class  after the configuration   SpringBootApplication   adding   ComponentScan  without having any arguments  worked for me      Main Class     SpringBootApplication  ComponentScan public class CommentStoreApplication        public static void main String   args            SpringApplication run CommentStoreApplication class  args              RestController Class     RestController public class CommentStoreApp         RequestMapping           public String hello             return  Hello World              P S  Don t miss to run  mvn clean and mvn install commands  before launching the application

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I was facing this issue and then later realized that I was missing the  Configuration annotation in the MvcConfig class which basically does the mapping for ViewControllers and setViewNames   Here is the content of the file    import org springframework context annotation Configuration  import org springframework web servlet config annotation ViewControllerRegistry  import org springframework web servlet config annotation WebMvcConfigurer     Configuration   public class MvcConfig implements WebMvcConfigurer     public void addViewControllers ViewControllerRegistry registry             registry addViewController      setViewName  login          registry addViewController   login   setViewName  login          registry addViewController   dashboard   setViewName  dashboard             Hope this helps somebody

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Do maven clean or clean verify and try to run it The instances has to be cleaned before deploying the another project  It worked for me  I tried it for 2 days to understand this

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In my case  this problem occurs when running the SpringApplication from within IntelliJ after running it first with maven   To solve the problem  I run first mvn clean  Then I run SpringApplication from within IntelliJ

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If all configurations are done correctly  as described in first two-three answers of this question  and still you are getting  Whitelabel Error Page  This application has no explicit mapping for  error  then this solution may help you   Sometimes beside configuration  issue can also be from your code side as well   You might have missed something very basic  To identify issue you need to check the trace  for that follow below steps  Open terminal  1 cd project location  to get the project location  e g  eclipse- project right click - properties- resource tab - copy path against location field  2 then run script   mvnw spring-boot run  then go to http   localhost 8080    http   localhost 8080 xyz whichever url you expecting data As soon as you hit the link  trace would have got updated    I was getting error like 2020-05-23 06 52 42 405 ERROR 3512 ---  nio-8080-exec-1  o a c c C          dispatcherServlet       Servlet service   for servlet  dispatcherServlet  in context with path    threw exception  Request processing failed  nested exception is org springframework orm jpa JpaSystemException  No default constructor for entity     com ibsplc com payroll model Employee  nested exception is org hibernate InstantiationException  No default constructor for entity     com ibsplc com payroll model Employee  with root cause  So  i added a default constructor for Employee model  run project as maven-build then then run script   mvnw spring-boot run  it worked for me

User · Answer

Do check if you have marked the controller class with  RestController annotation

User · Answer

it means you are trying to access the page which is not there  suppose your jsp file is at  webapp home jsp now if you use  RequestMapping   home   on your code and return  home jsp   then you will get this error if you try to access using localhost port  but if you try localhost port home there will be no error you can fix this by checking your  RequestMapping      here put  mapping path of the page you are trying to access  and you can also try adding a dependency of tomcat jaspher from maven dependency

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in my case it because of package position   meaning package of controller must be above main class package   if my main class package is package co companyname spring tutorial  any controller package should package co companyname spring tutorial WHAT EVER HERE   package co companyname spring tutorial     package for main class  SpringBootApplication public class FirstProjectApplication        public static void main String   args            SpringApplication run FirstProjectApplication class  args             package co companyname spring tutorial controllers     package for controllers   import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RestController    RestController  public class HelloController      RequestMapping   hello     public String hello         return  Hello  world          after finish coding press boot dashboard    one last thing to make sure your controller is mapping or not just console you should see somehting smilliar   Mapped     hello    onto public java lang String co companyname spring tutorial controllers HelloController hello     happy coding

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Please make sure You are not placing your View or JSP or HTML in WEB-INF or META-INF  Mention this details carefully   spring mvc view prefix spring mvc view suffix

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I ve been getting a similar error while trying out a Spring Boot sample application with Thymeleaf  tried all the different solutions provided unfortunately didn t worked   My error was that the returned string from Controller method was not having a respective view html   It might be you have missed or there could be some typo in the file name  As shown in the example inside the controller   GetMapping      public String listUploadedFiles Model model  throws IOException        model addAttribute  files   storageService loadAll   map              path - gt  MvcUriComponentsBuilder fromMethodName FileUploadController class                       serveFile   path getFileName   toString    build   toString                 collect Collectors toList           return  uploadForm       the return String should be match the html file name at      src main resources templates uploadForm html   Thymeleaf will look for the file with same name as in the return type and display the view  You can try with any html file and give the file name in return statement and it will populate the respective view

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I had tried many ways to fix this problem too  was like  I changed dependency   lt artifactId gt spring-boot-starter-web lt  artifactId gt  to  lt artifactId gt spring-boot-starter-thymeleaf lt  artifactId gt   or I replaced annotation  RestController to  Controller but It was the same error  Finally I found a solution by adding a single line of annotation  ComponentScan basePackages     hello    on the top of Application class and it works perfectly     ComponentScan basePackages     hello    public class Application       public static void main String   args  throws Exception           SpringApplication run App class  args             I hope it helps you guys too

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You might be getting the error i e    This application has no explicit mapping for  error  so you are seeing this as a fallback    This is because it is not scanning your Controller  amp  Service classes which you have to specify in your main   class like this   package com example demo  import org springframework boot SpringApplication  import org springframework boot autoconfigure EnableAutoConfiguration  import org springframework context annotation ComponentScan  import org springframework context annotation Configuration   Configuration  EnableAutoConfiguration    ComponentScan   com example demo    controller    service      public class SpringBootMvcExample1Application       public static void main String   args            SpringApplication run SpringBootMvcExample1Application class  args             Note  Here  I have specified various classes like demo  controller and service to be scanned then only it will work properly

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I know it s not exactly answer to question  but this question is first which appears on Google     Problem   This application has no explicit mapping for  error   appears when trying to access Swagger UI   In my case problems were caused by  RestController   endpoint    which isn t handled properly by swagger   So  this resulted in errors    RestController   endpoint   public class EndpointController     And this was fine   RestController  RequestMapping   endpoint   public class EndpointController

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I too got the same error and was able to resolve the error by adding the below dependency to my pom xml    lt dependency gt       lt groupId gt org apache tomcat embed lt  groupId gt       lt artifactId gt tomcat-embed-jasper lt  artifactId gt       lt scope gt provided lt  scope gt   lt  dependency gt    Reason is we are using JSP as the view  Default embedded servlet container for Spring Boot Starter Web is tomcat   To enable support for JSP   s  we would need to add a dependency on tomcat-embed-jasper   In my case I was returning a JSP as view from controller  Hope this answer helps someone who are struggling with same issue

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The problem is that you are navigating to localhost 8080  instead of localhost 8080 upload as prescribed in the guide  Spring Boot has a default error page used when you navigate to an undefined route to avoid giving away server specific details  which can be viewed as a security risk    You re options are to either  visit the right page  add your own landing page  or override the white error page   To simplify this particular situation  I updated the guide so that it uses   instead of  upload

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By default spring boot will scan current package for bean definition  So if your current package where main class is defined and controller package is not same or controller package is not child package of your main app package it will not scan the controller  To solve this issue one can include list of packages for bean definition in main package   SpringBootApplication scanBasePackages     com module restapi1 controller      or create a hierarchy of package where child package is derived from main package  package com module restapi  package com module restapi controller

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I need to mention this way and give the reference to packages and it worked out  You may exclude  EnableAutoConfiguration this annotation but required for me to bypass any DB related depenencies    SpringBootApplication  EnableAutoConfiguration exclude  DataSourceAutoConfiguration class    ComponentScan basePackages     your package 1    your package2     public class CommentStoreApplication        public static void main String   args            SpringApplication run CommentStoreApplication class  args

[spring] This application has no explicit mapping for /error

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