liliang8858 opened a new issue #1226: Exception while executing runnable 
URL: https://github.com/apache/incubator-skywalking/issues/1226
 
 
   - Why do you submit this issue?
   - [0] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [ ] Feature or performance improvement
   
   ___
   ### Question
   - What do you want to know?
   Exception while executing runnable 
   ___
   ### Bug
   - Which version of SkyWalking, OS and JRE?
   5.0.0
   - Which company or project?
   collector
   
   - What happen?
   spring boot - > 11800 
   SEVERE: Exception while executing runnable 
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed@1667dc5
   java.lang.NullPointerException
           at 
org.apache.skywalking.apm.collector.storage.es.dao.cache.ApplicationEsCacheDAO.getApplicationIdByCode(ApplicationEsCacheDAO.java:66)
           at 
org.apache.skywalking.apm.collector.cache.caffeine.service.ApplicationCacheCaffeineService.getApplicationIdByCode(ApplicationCacheCaffeineService.java:69)
           at 
org.apache.skywalking.apm.collector.analysis.register.provider.service.ApplicationIDService.getOrCreateForApplicationCode(ApplicationIDService.java:71)
           at 
org.apache.skywalking.apm.collector.agent.grpc.provider.handler.ApplicationRegisterServiceHandler.applicationCodeRegister(ApplicationRegisterServiceHandler.java:52)
           at 
org.apache.skywalking.apm.network.proto.ApplicationRegisterServiceGrpc$MethodHandlers.invoke(ApplicationRegisterServiceGrpc.java:225)
           at 
io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:171)
           at 
io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:272)
           at 
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:653)
           at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
           at 
io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
           at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
           at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
           at java.lang.Thread.run(Thread.java:748)
   
   
   spring boot + dubbo + zookeeper   
   skywalking
   
   

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