public ResponseEntity<ApiErrorDTO> constraintException(ConstraintViolationException exception) {
        ApiErrorDTO apiErrorDTO = new ApiErrorDTO();
        apiErrorDTO.setMessage(exception.getMessage());
        apiErrorDTO.setTimestamp(new Date().getTime());
        apiErrorDTO.setCode(exception.getMessage());
        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
                .header("Content-Type", "application/json; charset=utf-8")
                .body(apiErrorDTO);
    }