caqhy commented on PR #20984:
URL: https://github.com/apache/shardingsphere/pull/20984#issuecomment-1246775707
when etcd listener triggers in cluster modeļ¼application throws NPE.
```[ERROR] 2022-09-14 21:31:54.592 [grpc-default-executor-1]
c.g.common.eventbus.EventBus.default - Exception thrown by subscriber method
renew(org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.config.event.rule.RuleConfigurationsChangedEvent)
on subscriber
org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator@6ea246af
when dispatching event:
org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.config.event.rule.RuleConfigurationsChangedEvent@36eaf53b
java.lang.NullPointerException: null
at
org.apache.shardingsphere.mode.manager.ContextManager.getStaleResourceHeldRules(ContextManager.java:325)
at
org.apache.shardingsphere.mode.manager.ContextManager.alterRuleConfiguration(ContextManager.java:271)
at
org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator.renew(ClusterContextManagerCoordinator.java:149)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:87)
at
com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:144)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:72)
at
com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
at
com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:67)
at
com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:108)
at com.google.common.eventbus.EventBus.post(EventBus.java:212)
at
org.apache.shardingsphere.infra.util.eventbus.EventBusContext.post(EventBusContext.java:51)
at java.util.Optional.ifPresent(Optional.java:159)
at
org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.GovernanceWatcherFactory.lambda$watch$0(GovernanceWatcherFactory.java:59)
at
org.apache.shardingsphere.mode.repository.cluster.etcd.EtcdRepository.lambda$watch$2(EtcdRepository.java:157)
at io.etcd.jetcd.Watch$1.onNext(Watch.java:168)
at io.etcd.jetcd.WatchImpl$WatcherImpl.onNext(WatchImpl.java:289)
at io.etcd.jetcd.WatchImpl$WatcherImpl.onNext(WatchImpl.java:111)
at
io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onMessage(ClientCalls.java:465)
at
io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
at
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInternal(ClientCallImpl.java:652)
at
io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:637)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at
io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
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