RestControllerAdvice.java

@RestControllerAdvice
public class WebRestControllerAdvice {

  /**
   * 필수값이 안넘어왔을때 400 던지는 Custom Exception
   */
  @ExceptionHandler(BadRequestException.class)
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  public SimpleMessageDto invalidParameterException(BadRequestException ex) {
    return new SimpleMessageDto("missing required value");
  }
}