Invoke me service, skywalking logs throw null exception?

[fishinhouse]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• [-] Bug
• Requirement
• Feature or performance improvement

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Question

• What do you want to know?
  Invoke me service, skywalking logs throw null exception?

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Bug

• Which version of SkyWalking, OS and JRE?
  JRE
  OpenJDK Runtime Environment (build 1.8.0_212-b04)
  OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

OS
CentOS7

I download SkyWalking is here https://www.apache.org/dyn/closer.cgi/skywalking/6.2.0/apache-skywalking-apm-6.2.0.tar.gz.

• Which company or project?
  My demo project.
• What happen?
  If possible, provide a way for reproducing the error. e.g. demo application, component version.

DEBUG 2019-07-09 14:10:53:495 SkywalkingAgent-4-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient running, status:CONNECTED.
DEBUG 2019-07-09 14:10:54:134 SkywalkingAgent-4-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient running, status:CONNECTED.
DEBUG 2019-07-09 14:10:55:486 SkywalkingAgent-1-GRPCChannelManager-0 GRPCChannelManager : Selected collector grpc service running, reconnect:false.
DEBUG 2019-07-09 14:10:55:532 SkywalkingAgent-4-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient running, status:CONNECTED.
ERROR 2019-07-09 14:10:56:474 reactor-http-server-epoll-6 InstMethodsInter : class[class reactor.ipc.netty.http.server.HttpServerOperations] after method[onOutboundComplete] intercept failure
java.lang.NullPointerException
at org.apache.skywalking.apm.agent.core.context.ContextManager.activeSpan(ContextManager.java:161)
at org.apache.skywalking.apm.agent.core.context.ContextManager.stopSpan(ContextManager.java:165)
at org.apache.skywalking.apm.plugin.spring.webflux.v5.OnOutboundCompleteInterceptor.afterMethod(OnOutboundCompleteInterceptor.java:40)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105)
at reactor.ipc.netty.http.server.HttpServerOperations.onOutboundComplete(HttpServerOperations.java)
at reactor.ipc.netty.channel.ChannelOperations.onComplete(ChannelOperations.java:221)
at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:321)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableConditionalSubscriber.onComplete(FluxPeekFuseable.java:555)
at reactor.core.publisher.Operators$MonoSubscriber.onComplete(Operators.java:1121)
at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onComplete(MonoIgnoreThen.java:313)
at reactor.core.publisher.Operators.complete(Operators.java:128)
at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:45)
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.ignoreDone(MonoIgnoreThen.java:190)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreInner.onComplete(MonoIgnoreThen.java:239)
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:1318)
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:1318)
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:1318)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onComplete(FluxPeekFuseable.java:265)
at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:321)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:189)
at reactor.core.publisher.MonoFlatMap$FlatMapInner.onComplete(MonoFlatMap.java:260)
at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:321)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onComplete(MonoFlatMap.java:174)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:189)
at reactor.core.publisher.MonoFlatMap$FlatMapInner.onComplete(MonoFlatMap.java:260)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:144)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.ignoreDone(MonoIgnoreThen.java:190)
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreInner.onComplete(MonoIgnoreThen.java:239)
at reactor.core.publisher.Operators$MonoSubscriber.onComplete(Operators.java:1121)
at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onComplete(MonoIgnoreThen.java:313)
at org.springframework.http.server.reactive.ChannelSendOperator$WriteCompletionBarrier.onComplete(ChannelSendOperator.java:373)
at reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onComplete(MonoIgnoreElements.java:80)
at reactor.core.publisher.FluxConcatIterable$ConcatIterableSubscriber.onComplete(FluxConcatIterable.java:121)
at reactor.core.publisher.Operators$MonoSubscriber.onComplete(Operators.java:1121)
at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onComplete(MonoIgnoreThen.java:313)
at reactor.ipc.netty.FutureMono$ChannelFutureSubscription.setSuccess(FutureMono.java:377)
at io.netty.channel.DefaultChannelPromise.setSuccess(DefaultChannelPromise.java:73)
at reactor.ipc.netty.channel.ChannelOperationsHandler$PublisherSender.operationComplete(ChannelOperationsHandler.java:748)
at reactor.ipc.netty.channel.ChannelOperationsHandler$PublisherSender.operationComplete(ChannelOperationsHandler.java:490)
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511)
at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485)
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424)
at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:162)
at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:95)
at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:30)
at reactor.ipc.netty.channel.ChannelOperationsHandler$PublisherSender.onComplete(ChannelOperationsHandler.java:602)
at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:130)
at org.springframework.http.server.reactive.ChannelSendOperator$WriteBarrier.emitCachedSignals(ChannelSendOperator.java:289)
at org.springframework.http.server.reactive.ChannelSendOperator$WriteBarrier.subscribe(ChannelSendOperator.java:314)
at reactor.core.publisher.FluxSource.subscribe(FluxSource.java:52)
at reactor.core.publisher.FluxMap.subscribe(FluxMap.java:62)
at reactor.ipc.netty.FutureMono$1.subscribe(FutureMono.java:141)
at reactor.core.publisher.Flux.subscribe(Flux.java:6877)
at reactor.ipc.netty.channel.ChannelOperationsHandler.drain(ChannelOperationsHandler.java:471)
at reactor.ipc.netty.channel.ChannelOperationsHandler.flush(ChannelOperationsHandler.java:194)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768)
at io.netty.channel.AbstractChannelHandlerContext.access$1500(AbstractChannelHandlerContext.java:38)
at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1129)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1070)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:315)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
at java.lang.Thread.run(Thread.java:748)

D

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Requirement or improvement

• Please describe about your requirements or improvement suggestions.

[fishinhouse]

Error log file is agent/logs/skywalking-api.log.

[fishinhouse]

Version 6.1 and 6.2 all answer.

[wu-sheng]

Make sure the library you are using in our supported list.