wangmh opened a new issue #1044: 5.0.0-alpha grpc server CallServerInterceptor 
some times has null exception
URL: https://github.com/apache/incubator-skywalking/issues/1044
 
 
   Please answer these questions before submitting your issue.
   
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [# ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   
   ### Bug
   - Which version of SkyWalking, OS and JRE?
     5.0.0 alpha  mac jdk 1.8
   - Which company or project?
     http://hualala.com/
   - What happen?
   
   `
   四月 07, 2018 2:55:18 下午 io.grpc.internal.SerializingExecutor run
   严重: Exception while executing runnable 
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1Closed@5cd81a9e
   java.lang.NullPointerException
        at 
org.apache.skywalking.apm.agent.core.context.ContextManager.activeSpan(ContextManager.java:163)
        at 
org.apache.skywalking.apm.agent.core.context.ContextManager.stopSpan(ContextManager.java:167)
        at 
org.apache.skywalking.apm.plugin.grpc.v1.CallServerInterceptor$ServerCallListener.onComplete(CallServerInterceptor.java:97)
        at 
io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.closed(ServerCallImpl.java:278)
        at 
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1Closed.runInContext(ServerImpl.java:679)
        at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
        at 
io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)`
   

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