ExceptionHandlerController.java

    @ResponseBody
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<List<ObjectError>> processValidationError(HttpServletRequest httpServletRequest, MethodArgumentNotValidException manve) throws MethodArgumentNotValidException {
        return new ResponseEntity<>(manve.getBindingResult().getAllErrors(), HttpStatus.BAD_REQUEST);
    }