Question

我正在使用Jetty 9.3.3。我实现了我的自定义错误处理程序类，调用了handle方法，但是不知道为什么导致没有throwable对象：

以下是我班级的代码：

public class TestExecuterServerErrorHandler extends ErrorHandler{

    private Logger logger=Logger.getLogger(this.getClass().getName());  

    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException{
        logger.systemWriteOutput("handeling error", 3);

        ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
        Throwable th = (Throwable)request.getAttribute(RequestDispatcher.ERROR_EXCEPTION); 

        response.setContentType("text/xml");

        if(th!=null)
        {
            writeResponseError(response.getStatus(), th, writer);
            th.printStackTrace();
        }

        writer.flush();
        response.setContentLength(writer.size());       
        writer.writeTo(response.getOutputStream());
        writer.destroy();        
    }
}

输出：

handeling error
handeling error

如何打印句柄方法调用的原因？

Answer 1

使用Jetty和Jersey时遇到了同样的问题。我通过将属性// Rather than setting -myLocationEnabled to YES directly, // call this method: - (void)enableMyLocation { CLAuthorizationStatus status = [CLLocationManager authorizationStatus]; if (status == kCLAuthorizationStatusNotDetermined) [self requestLocationAuthorization]; else if (status == kCLAuthorizationStatusDenied || status == kCLAuthorizationStatusRestricted) return; // we weren't allowed to show the user's location so don't enable else [self.view setMyLocationEnabled:YES]; } // Ask the CLLocationManager for location authorization, // and be sure to retain the manager somewhere on the class - (void)requestLocationAuthorization { _locationAuthorizationManager = [[CLLocationManager alloc] init]; _locationAuthorizationManager.delegate = self; [_locationAuthorizationManager requestAlwaysAuthorization]; } // Handle the authorization callback. This is usually // called on a background thread so go back to main. - (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status { if (status != kCLAuthorizationStatusNotDetermined) { [self performSelectorOnMainThread:@selector(enableMyLocation) withObject:nil waitUntilDone:[NSThread isMainThread]]; _locationAuthorizationManager.delegate = nil; _locationAuthorizationManager = nil; } }设置为ServerProperties.RESPONSE_SET_STATUS_OVER_SEND_ERROR来解决它，从而阻止Jersey过早地返回响应（在将异常附加到请求对象之前）。

Jetty自定义错误处理程序类被调用但没有可抛出的对象

1 个答案: