Spring validation returns long error messages, not just the customized message

问题

Spring validation returns long error message instead of the customized once.

This is the section of code in the dto.

public class RequestDto implements Serializable {
    @NotNull(message="{id.required}")
    private Long id;

}

In controller added the @Valid for input.

@RequestMapping(value = ApiPath.PATH, method = RequestMethod.POST, produces = { "application/xml",
            "application/json" })
    public @ResponseBody ResultDecorator saveRequest(
            @Valid @RequestBody RequestDto msaDisabScreenRequestDto) throws Exception {

}

API returns the following error.

<message>Validation failed for argument at index 0 in method: public om.gov.moh.msa.framework.resolver.ResultDecorator om.controller.MaController.saveRequest(om..dto.RequestDto) throws java.lang.Exception, with 1 error(s): [Field error in object 'requestDto' on field 'id': rejected value [null]; codes [NotNull.requestDto.id,NotNull.id,NotNull.java.lang.Long,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [requestDto.id,id]; arguments []; default message [civilId]]; **default message [ID is required.]]** </message>

Here the custom message is present at the end. (default message [ID is required.)

Using Controller advice for global exception and I'm overriding handleMethodArgumentNotValid. How can I return only the custom message here?

@Order(Ordered.HIGHEST_PRECEDENCE)
@ControllerAdvice
public class RestExceptionHandler extends ResponseEntityExceptionHandler {



   /**
    * Spring validation related exception
    */
   @Override
   protected ResponseEntity<Object> handleMethodArgumentNotValid(
           MethodArgumentNotValidException ex,
           HttpHeaders headers,
           HttpStatus status,
           WebRequest request) {

       ApiError apiError = new ApiError(HttpStatus.BAD_REQUEST);
       apiError.setMessage(ex.getMessage());
       return buildResponseEntity(apiError);
   }
}

回答1:

You can get default/custom message like result.getFieldError("yourFieldName").getDefaultMessage()

You can catch error messages either through controller method which should look like this

    @RequestMapping(value = ApiPath.PATH, method = RequestMethod.POST, produces = { "application/xml", "application/json" })
    public @ResponseBody ResultDecorator saveRequest(@Valid @RequestBody RequestDto msaDisabScreenRequestDto, BindingResult result) throws Exception {
        if(result.hasErrors()){
            String errorMessage = result.getFieldError("yourFieldName").getDefaultMessage();
        }
    }

Or through Global Exception handler

Updated

    @Order(Ordered.HIGHEST_PRECEDENCE)
    @ControllerAdvice
    public class RestExceptionHandler extends ResponseEntityExceptionHandler {



       /**
        * Spring validation related exception
        */
       @Override
       protected ResponseEntity<Object> handleMethodArgumentNotValid(
               MethodArgumentNotValidException ex,
               HttpHeaders headers,
               HttpStatus status,
               WebRequest request) {

           //New Code
           BindingResult bindingResult = ex.getBindingResult();
           String errorMessage = result.getFieldError("yourFieldName").getDefaultMessage();
//---------------
           ApiError apiError = new ApiError(HttpStatus.BAD_REQUEST);
           apiError.setMessage(errorMessage);
           return buildResponseEntity(apiError);
       }
    }

回答2:

As Afridi said in @ControllerAdvice can do this also:

@ExceptionHandler(value = MethodArgumentNotValidException.class)
@SuppressWarnings("unchecked")
@ResponseBody
public Result methodArgumentNotValidExceptionHandler(HttpServletRequest req, HttpServletResponse response, MethodArgumentNotValidException e) throws IOException {
    String message = e.getBindingResult().getAllErrors().get(0).getDefaultMessage();

    // todo return to your custom result
}

There are two point :

• Exception class is MethodArgumentNotValidException
• The first Error getDefaultMessage() can get your custom message in Annotation

回答3:

Thanks Afridi, Created a string buffer and added all the error messages into that.

   /**
    * Spring validation related exception
    */
   @Override
   protected ResponseEntity<Object> handleMethodArgumentNotValid(
           MethodArgumentNotValidException ex,
           HttpHeaders headers,
           HttpStatus status,
           WebRequest request) {

       final StringBuffer errors = new StringBuffer();
       ApiError apiError = new ApiError(HttpStatus.BAD_REQUEST);
       for (final FieldError error : ex.getBindingResult().getFieldErrors()) {
           errors.append("\n");
           errors.append(error.getField() + ": " + error.getDefaultMessage());
       }
       apiError.setMessage(errors.toString());
       return buildResponseEntity(apiError);
   }

来源：https://stackoverflow.com/questions/50737381/spring-validation-returns-long-error-messages-not-just-the-customized-message