오류 처리 및 조언

public class UserNotFoundException extends RuntimeException {
  public UserNotFoundException(Long id) {
    super("User not found with id " + id);
  }
}

public User find(Long id) {
  return repo.findById(id)
            .orElseThrow(() -> new UserNotFoundException(id));
}

import org.springframework.web.bind.annotation.*;@ControllerAdvice
public class GlobalExceptionHandler {
  @ExceptionHandler(UserNotFoundException.class)
  @ResponseBody
  public String handleNotFound(UserNotFoundException ex) {
    return ex.getMessage();
  }
}