spring-mvc - 如何捕获 FeignClient 异常

Question

我 try catch 从 FeignClient 连接的另一个微服务收到的异常。我制作了自定义的 ErrorDecoder，并且

public class CustomErrorDecoder implements ErrorDecoder {

    private final Logger log = LoggerFactory.getLogger(getClass());

    private final ErrorDecoder defaultErrorDecoder = new Default();

    @Override
    public Exception decode(String methodKey, Response response) {

        if (response.status() >= 400 && response.status() <= 499) {
            log.info("----------------- "+methodKey+" , "+response.status()+" , "+ response.reason());
            return new RestApiException(99,99,"");
        }
        return defaultErrorDecoder.decode(methodKey, response);
    }
} 

其中 RestApiException 扩展了 Exception。

@ControllerAdvice
public class GlobalControllerAdvice {

    private final Logger log = LoggerFactory.getLogger(getClass());

    @ExceptionHandler(RestApiException.class)
    public ResponseEntity<RestApiException> handleException(RestApiException exception, HttpServletRequest req) {
        log.error("Sending error to client ( "+req.getUserPrincipal().getName()+" ) \"{}\"", exception.getErrMsg());
        return new ResponseEntity<RestApiException>(exception, exception.getStatus());
    }

    @ExceptionHandler(Throwable.class)
    public ResponseEntity<RestApiException> handleException(Throwable throwable, HttpServletRequest req) {
        RestApiException exception=new RestApiException(HttpStatus.INTERNAL_SERVER_ERROR, 100, 100,
                throwable.getMessage());
        return handleException(exception, req);
    }

结果，当我得到 <--- HTTP/1.1 400 Bad Request (5380ms)
我有默认的错误消息

HttpStatus.INTERNAL_SERVER_ERROR, 100, 100,
throwable.getMessage());

但不是 expexted 自定义异常，我尝试在 CustomErrorDecoder 中设置。

我做错了什么，为什么我不能调用 RetAppiException 并向其余客户端返回错误答案。

谢谢。

Answer 1

您无法使用 @ControllerAdvice 捕获 FeignClient 的异常。 .异常处理程序不会捕获由 feign 客户端、错误解码器生成的异常。

一个简单的解决方案是捕捉你的假调用，然后抛出你想要的异常。

try{
   feignClient.method();
} catch(Exception ex){
  //throw exceptions you want
  throw new YourException();
}

然后你将能够处理它:

@ControllerAdvice
public class GlobalControllerAdvice {

    private final Logger log = LoggerFactory.getLogger(getClass());

    @ExceptionHandler(YourException.class)
    public ResponseEntity<RestApiException> handleException(RestApiException exception, HttpServletRequest req) {
        //impl
    }

}