How to get response in JSON format using @ExceptionHandler in Spring MVC

You can annotate the handler method with @ResponseBody and return any object you want and it should be serialized to JSON (depending on your configuration of course). For instance:

public class Error {    private String message;    // Constructors, getters, setters, other properties ...}@ResponseBody@ResponseStatus(HttpStatus.BAD_REQUEST)@ExceptionHandler(MethodArgumentNotValidException.class)public Error handleValidationException(MethodArgumentNotValidException e) {    // Optionally do additional things with the exception, for example map    // individual field errors (from e.getBindingResult()) to the Error object    return new Error("Invalid data");}

which should produce response with HTTP 400 code and following body:

{    "message": "Invalid data"}

Also see Spring JavaDoc for @ExceptionHandler which lists possible return types, one of which is:

@ResponseBody annotated methods (Servlet-only) to set the response content. The return value will be converted to the response stream using message converters.

Replace

@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "Error in the process")

by

@ResponseStatus(value = HttpStatus.NOT_FOUND)

the 'reason' attribute force html render!I've waste 1 day on that.....

ResponseEntity class will serialize you JSON response by default here andthrow RuntimeException wherever you want to in application

throw RuntimeException("Bad Request")

Write GlobalExceptionHandler class

@ControllerAdvicepublic class GlobalExceptionHandler extends ResponseEntityExceptionHandler {    private class JsonResponse {        String message;        int httpStatus ;        public JsonResponse() {        }        public JsonResponse(String message, int httpStatus ) {            super();            this.message = message;            this.httpStatus = httpStatus;        }        public String getMessage() {            return message;        }        public void setMessage(String message) {            this.message = message;        }        public int getHttpStatus() {            return httpStatus;        }        public void setHttpStatus(int httpStatus) {            this.httpStatus = httpStatus;        }    }    @ExceptionHandler({ RuntimeException.class })    public ResponseEntity<JsonResponse> handleRuntimeException(    Exception ex, WebRequest request) {      return new ResponseEntity<JsonResponse>(              new JsonResponse(ex.getMessage(), 400 ), new HttpHeaders(), HttpStatus.BAD_REQUEST);    }}

Output:

{    "message": "Bad Request",    "httpStatus": 400}