映射到 MethodArgumentNotValidException 和 NoHandlerFoundException 的模糊 @ExceptionHandler 方法

Question

我需要在全局异常处理程序中使用 NoHandlerFoundException 异常处理程序。

我已经通过从扩展的 ResponseEntityExceptionHandler 类重写 MethodArgumentNotValidException 处理程序来使用它。

现在，在运行应用程序时，我收到此异常。

我使用 Argument Not valid handler 方法来处理请求正文中缺少的字段。

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate \[org.springframework.web.servlet.HandlerExceptionResolver\]: Factory method 'handlerExceptionResolver' threw exception with message: Ambiguous @ExceptionHandler method mapped for \[class org.springframework.web.bind.MethodArgumentNotValidException\]: {protected org.springframework.http.ResponseEntity com.kroger.iwt.coreservice.exception.handler.GlobalExceptionHandler.handleMethodArgumentNotValid(org.springframework.web.bind.MethodArgumentNotValidException,org.springframework.http.HttpHeaders,org.springframework.http.HttpStatusCode,org.springframework.web.context.request.WebRequest), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest) throws java.lang.Exception}

@Slf4j
@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler({ NoHandlerFoundException.class })
    @ResponseBody
    @ResponseStatus(HttpStatus.NOT_FOUND)
    public ResponseEntity<ErrorListResponse> notFound(final NoHandlerFoundException exception) {
        log.error("{} {}", 404, exception.getMessage());
        ErrorListResponse errorListResponse = errorResponse("Request URI Not Found", exception);
        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(errorListResponse);
    }



//    @Override
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ResponseBody
    protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatusCode status, WebRequest request) {
        List<FieldError> errors = ex.getBindingResult().getFieldErrors();
        List<ErrorListResponse.ErrorDetails> errorDetails = new ArrayList<>();
        for (FieldError fieldError : errors) {
            ErrorListResponse.ErrorDetails error = new ErrorListResponse.ErrorDetails();
            error.setReason(fieldError.getDefaultMessage());
            error.setCode("BAD_REQUEST");
            error.setDatetime(new DateTimeResponse(Instant.now().toString(), "America/New_York"));
            errorDetails.add(error);
        }
        ErrorListResponse errorResponse = new ErrorListResponse();
        errorResponse.setErrors(errorDetails);
        log.error("{} {}", 400, "Multiple fields are invalid");
        return new ResponseEntity(errorResponse, HttpStatus.BAD_REQUEST);
    }
}

Answer 1

当您扩展

ResponseEntityExceptionHandler

类并重写其方法时，您不应使用

@ExceptionHandler

注释。

否则 Spring 的

org.springframework.web.servlet.HandlerExceptionResolver

会为同一个异常类找到多个处理程序并报告错误。

这对于仅处理这些异常的方法也有效。即使有不同的名字。此处列出了例外情况：

@ExceptionHandler({
    HttpRequestMethodNotSupportedException.class,
    HttpMediaTypeNotSupportedException.class,
    HttpMediaTypeNotAcceptableException.class,
    MissingPathVariableException.class,
    MissingServletRequestParameterException.class,
    MissingServletRequestPartException.class,
    ServletRequestBindingException.class,
    MethodArgumentNotValidException.class,
    HandlerMethodValidationException.class,
    NoHandlerFoundException.class,
    NoResourceFoundException.class,
    AsyncRequestTimeoutException.class,
    ErrorResponseException.class,
    MaxUploadSizeExceededException.class,
    ConversionNotSupportedException.class,
    TypeMismatchException.class,
    HttpMessageNotReadableException.class,
    HttpMessageNotWritableException.class,
    MethodValidationException.class,
    BindException.class
})

解决方案

从处理与

@ExceptionHandler

中相同的异常的方法中删除

ResponseEntityExceptionHandler

注释。