Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]

I'm trying to handle MethodArgumentNotValidException using @ControllerAdvice as code given below:

@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

    private Logger log = LoggerFactory.getLogger(RestResponseEntityExceptionHandler.class);

    @Autowired
    private ApplicationContext applicationContext;

    @ExceptionHandler({ ConstraintViolationException.class })
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ResponseBody
    public ErrorWrapper handleConstraintViolationException(ConstraintViolationException e) {
        String fieldName = e.getConstraintName();
        String message = getResourceMessage(fieldName + ".alreadyExists", "Already Exists");
        return new ErrorWrapper(fieldName + ".error", message);
    }

    @ExceptionHandler({ MethodArgumentNotValidException.class })
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ResponseBody
    public ErrorWrapper handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
        return new ErrorWrapper(".error", "test");
    }

    private String getResourceMessage(String key, String defaultMessage) {
        String message = applicationContext.getMessage(key, null, Locale.getDefault());
        if (StringUtils.isNotEmpty(message)) {
            return message;
        }
        return defaultMessage;
    }
}

I'm getting following Exception

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public com.ca.bean.ErrorWrapper com.ca.exceptionHandler.RestResponseEntityExceptionHandler.handleMethodArgumentNotValidException(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest)}
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:775) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) ~[spring-context-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) [spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5099) [catalina.jar:7.0.70]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5615) [catalina.jar:7.0.70]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) [catalina.jar:7.0.70]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571) [catalina.jar:7.0.70]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561) [catalina.jar:7.0.70]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_92]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_92]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_92]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_92]
Caused by: java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public com.ca.bean.ErrorWrapper com.ca.exceptionHandler.RestResponseEntityExceptionHandler.handleMethodArgumentNotValidException(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest)}
    at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.addExceptionMapping(ExceptionHandlerMethodResolver.java:109) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.<init>(ExceptionHandlerMethodResolver.java:76) ~[spring-web-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.initExceptionHandlerAdviceCache(ExceptionHandlerExceptionResolver.java:265) ~[spring-webmvc-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.afterPropertiesSet(ExceptionHandlerExceptionResolver.java:241) ~[spring-webmvc-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.3.0.RELEASE.jar:4.3.0.RELEASE]
    ... 21 common frames omitted

I'm using spring 4.3.0. I want to handle MethodArgumentNotValidException and want to send custom message. What mistake I'm doing? Please help.

Springs ResponseEntityExceptionHandler has a method handleException which is annotated with :

@ExceptionHandler({     
        ...
        MethodArgumentNotValidException.class,
        ... 
    })

Your method handleMethodArgumentNotValidException is also annotated to handle MethodArgumentNotValidException. So spring finds two methods that should be used to handle the same exception, that is the reason for the exception.

**Solution ** Do not add a new method handleMethodArgumentNotValidException instead just override the method ResponseEntityExceptionHandler.handleMethodArgumentNotValid , and do not annotate it. Your class ErrorWrapper must extend ResponseEntity for that.

Try to override the method handleMethodArgumentNotValid, In my case the method become like this:

  @Override
  protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
                                                                HttpHeaders headers, HttpStatus status,
                                                                WebRequest request) {
    String errorMessage = ex.getBindingResult().getFieldErrors().stream()
                 .map(DefaultMessageSourceResolvable::getDefaultMessage)
                 .findFirst()
                 .orElse(ex.getMessage());
    return response(ex, request, HttpStatus.BAD_REQUEST, errorMessage);
  }

  private ResponseEntity<Object> response(Exception ex, WebRequest request, HttpStatus status,
                                          String message) {
    return handleExceptionInternal(ex, message, header(), status, request);
  }

Handel Exception

@RestControllerAdvice
@Slf4j
public class ExceptionHandler extends ResponseEntityExceptionHandler {
    @Override
    protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
        List<String> errorList = ex
                .getBindingResult()
                .getFieldErrors()
                .stream()
                .map(fieldError -> fieldError.getDefaultMessage())
                .collect(Collectors.toList());
        ErrorDetails errorDetails = new ErrorDetails(HttpStatus.BAD_REQUEST, ex.getLocalizedMessage(), errorList);
        return handleExceptionInternal(ex, errorDetails, headers, errorDetails.getStatus(), request);
    }
}

Customize Error Message

@Data
public class ErrorDetails {
    private HttpStatus status;
    private String message;
    private List<String> errors;

    public ErrorDetails(HttpStatus status, String message, List<String> errors) {
        super();
        this.status = status;
        this.message = message;
        this.errors = errors;
    }

    public ErrorDetails(HttpStatus status, String message, String error) {
        super();
        this.status = status;
        this.message = message;
        errors = Arrays.asList(error);
    }
}

Sample Response

  {
      "status": "BAD_REQUEST",
      "message": "Validation failed for argument [0] in public void com.ns.hospitalmanagement.resource.PatientResource.createPatient(com.ns.hospitalmanagement.entity.Patient) with 2 errors: [Field error in object 'patient' on field 'name': rejected value [null]; codes [NotNull.patient.name,NotNull.name,NotNull.java.lang.String,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [patient.name,name]; arguments []; default message [name]]; default message [Name Can not be Null]] [Field error in object 'patient' on field 'name': rejected value [null]; codes [NotEmpty.patient.name,NotEmpty.name,NotEmpty.java.lang.String,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [patient.name,name]; arguments []; default message [name]]; default message [Name Can not be Empty]] ",
      "errors": [
        "Name Can not be Null",
        "Name Can not be Empty"
      ]
    }