@ControllerAdvice
public class ExceptionControllerAdvice {

  @ExceptionHandler({
    ConstraintViolationException.class,
    DataIntegrityViolationException,
    IllegalArgumentException
  })
  @ResponseBody
  public ResponseEntity<Error> invalidRequestHandler(RuntimeException ex) {
    // ...
    return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
  }
// ...
}

@RestControllerAdvice 
public class ExceptionRestControllerAdvice {

  @ExceptionHandler({
    ConstraintViolationException.class,
    DataIntegrityViolationException,
    IllegalArgumentException
  })
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  public ResponseEntity<Error> invalidRequestHandler(RuntimeException ex) {
    Error error = Error.builder()
      .timestamp(new Date())
      .message(ex.getMessage())
      .build();
    return error;
  }
// ...
}