SpringMVC ResponseStatusException Sınıfı

Giriş

Şu satırı dahil ederiz

import org.springframework.web.server.ResponseStatusException;

Bu sınıfın iki kullanım yöntemi var

1. Servis kodundan fırlatılır ve istemciye kadar gitmesine izin verilir

2. Servis kodundan fırlatılır ve @ExceptionHandler(ResponseStatusException.class) ile yakalanarak bir exception sonucu nesnesine çevrilir.

Ancak bu iki yöntem yerine şu yöntem tercih edilebilir. Açıklaması şöyle

This exception can even be used at the service level and that approach can help you in terms of the number of exceptions you are creating. But as you can probably guess by now it is not a good solution for unified exception handling compared to ControllerAdvice or HandlerExceptionResolver.

Örnek

Şöyle yaparız

@RestController
@RequestMapping("/api/v1/")
public class StudentRestController {

  @Autowired
  StudentService studentService;

  @GetMapping("student/{id}")
  public ResponseEntity<Student> getUser(
    @PathVariable(name = "id", required = false) Long id  ) {
    Student student;
    try {
      student = studentService.findStudentById(null);
    } catch (InvalidIdException e) {
      throw new ResponseStatusException(HttpStatus.BAD_REQUEST, 
        e.getMessage(), e);
    } catch (ServiceDownTimeException e) {
      throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE, 
        e.getMessage(), e);
    }
    return ResponseEntity
      .status(HttpStatus.OK)
      .body(student);
  }
}

HTTP sonucu şöyle

{
  "timestamp": "2022-05-20T19:17:54.442+00:00",
  "status": 503,
  "error": "Service Unavailable",
  "message": "1-2 AM is service downtime!",
  "path": "/api/v1/student/1"
}

Örnek - Kalıtım

Şöyle yaparız

public class NoSuchElementFoundException extends ResponseStatusException {

  public NoSuchElementFoundException(String message){
    super(HttpStatus.NOT_FOUND, message);
  }

  @Override
  public HttpHeaders getResponseHeaders() {
      // return response headers
  }
}

getStatusCode metodu

Spring 3 ile ResponseStatusException -> getStatus() metodu yerine getStatusCode() metodu geldi

Örnek

Şöyle yaparız

@ExceptionHandler(ResponseStatusException.class)
public ResponseEntity<ErrorResponse> handleNotFound(ResponseStatusException exception) {
  final ErrorResponse errorResponse = new ErrorResponse();

 // errorResponse.setHttpStatus(exception.getStatus().value());
 errorResponse.setHttpStatus(exception.getStatusCode().value());

 errorResponse.setException(exception.getClass().getSimpleName());
 errorResponse.setMessage(exception.getMessage());
 
 // return new ResponseEntity<>(errorResponse, exception.getStatus());
 return new ResponseEntity<>(errorResponse, exception.getStatusCode());
}