sky-dail opened a new issue #5490:
URL: https://github.com/apache/skywalking/issues/5490


   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [x] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   ~~~
   2020-09-15 16:11:41.840  WARN 1 --- [nio-8080-exec-2] 
o.s.c.n.z.filters.post.SendErrorFilter   : Error during filtering
   com.netflix.zuul.exception.ZuulException: Forwarding error
        at 
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:189)
        at 
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:164)
        at 
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:111)
        at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:112)
        at 
com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193)
        at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157)
        at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:118)
        at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96)
        at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116)
        at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81)
        at 
org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:157)
        at 
org.springframework.cloud.netflix.zuul.web.ZuulController.handleRequest(ZuulController.java:44)
        at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
   Caused by: com.netflix.client.ClientException: null
        at 
com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:118)
        at 
org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:152)
        at 
org.springframework.cloud.netflix.zuul.filters.route.support.AbstractRibbonCommand.run(AbstractRibbonCommand.java:49)
        at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302)
        at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
        at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
        at 
rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
        at rx.Observable.unsafeSubscribe(Observable.java:10151)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
        at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
        at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
        at rx.Observable.subscribe(Observable.java:10247)
        at rx.Observable.subscribe(Observable.java:10214)
        at 
rx.internal.operators.BlockingOperatorToFuture.toFuture(BlockingOperatorToFuture.java:51)
        at 
rx.observables.BlockingObservable.toFuture(BlockingObservable.java:411)
        at com.netflix.hystrix.HystrixCommand.queue(HystrixCommand.java:378)
        at com.netflix.hystrix.HystrixCommand.execute(HystrixCommand.java:344)
        at 
org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:158)
        ... 67 common frames omitted
   ~~~
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   
   - Which company or project?
   
   - What happened?
   If possible, provide a way to reproduce the error. e.g. demo application, 
component version.
   
   ___
   ### Requirement or improvement
   - Please describe your requirements or improvement suggestions.
   


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