java - 永远不会调用 RestController 中 MethodArgumentNotValidException 的 Spring Boot ExceptionHandler

Question

我使用的是 Spring Boot v2.2.10 和 Spring v5.2.9。我创建了一个带有 @Valid @RequestBody 注释的 Rest Controller 。验证工作正常(当提交超出约束的值时，我收到 400 BAD REQUEST 响应)，但我不喜欢默认错误消息，因为它揭示了太多的内部结构。因此，我定义了一个 @ExceptionHandler(MethodArgumentNotValidException.class) 方法，但此方法从未被调用。

这是带有异常处理程序的 Controller :

import java.util.List;
import java.util.stream.Collectors;

import javax.validation.Valid;

import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;
import lombok.RequiredArgsConstructor;


@RestController
@RequiredArgsConstructor
@RequestMapping("/api/data")
public class DataController {

    @PostMapping(path = "/{id}", consumes = MediaType.APPLICATION_JSON_VALUE)
    private void postData(
            @PathVariable String id,
            @Valid @RequestBody MyDTO dto) {
        
        // DO SOMETHING

    }
    
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public List<String> handleValidationExceptions(MethodArgumentNotValidException ex) {
        System.out.println("Handling method argument not valid exception");
        return ex.getBindingResult()
            .getAllErrors().stream()
            .map(ObjectError::getDefaultMessage)
            .collect(Collectors.toList());
    } 
}

DTO:

import javax.validation.constraints.Max;
import lombok.Getter;

@Getter
public class MyDTO {
    
    @Max(value = 1, message = "Value should not be greater than 1")
    private float value;
    
}

我还尝试将 ExceptionHandler 放入一个额外的类中:

// Imports

@Order(Ordered.HIGHEST_PRECEDENCE)
@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    // Same as before

}

正如我所说，我的 ExceptionHandler 永远不会被调用。我可能做错了什么？

Answer 1

尝试从类 ResponseEntityExceptionHandler 扩展并覆盖 handleMethodArgumentNotValid

@Order(Ordered.HIGHEST_PRECEDENCE)
@ControllerAdvice
@Slf4j
public class ExceptionController extends ResponseEntityExceptionHandler {

@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
        HttpHeaders headers, HttpStatus status, WebRequest request) {
    return ...;
}