ApiExceptionAdvice.java

import org.springframework.web.bind.MethodArgumentNotValidException;

@RestControllerAdvice("controller")
public class ApiExceptionAdvice {

  @ExceptionHandler(MethodArgumentNotValidException.class)
  public ResponseEntity<ErrorResponse> handleBindException(MethodArgumentNotValidException ex) {
    String errorCodes = ex
        .getBindingResult()
        .getAllErrors()
        .stream()
        .map(error -> error.getCodes()[0])
        .collect(Collectors.joining(","));
    return ResponseEntity
        .status(HttpStatus.BAD_REQUEST)
        .body(new ErrorResponse("errorCodes = " + errorCodes));
  }

}