RaigorJiang opened a new issue #12513:
URL: https://github.com/apache/shardingsphere/issues/12513
## Bug Report
### Which version of ShardingSphere did you use?
master branch
### Steps to reproduce the behavior
When Start with cluster mode, and there is `no existed data on ZooKeeper,`
`NPE` will thrown from the method below:
```java
@Subscribe
public synchronized void renew(final PrimaryStateChangedEvent event) {
ClusterSchema clusterSchema = event.getClusterSchema();
Collection<ShardingSphereRule> rules =
contextManager.getMetaDataContexts().getMetaDataMap().get(clusterSchema.getSchemaName()).getRuleMetaData().getRules();
for (ShardingSphereRule each : rules) {
if (each instanceof StatusContainedRule) {
((StatusContainedRule) each).updateStatus(new
PrimaryDataSourceChangedEvent(clusterSchema.getSchemaName(),
clusterSchema.getDataSourceName(), event.getPrimaryDataSourceName()));
}
}
}
```
Error log:
```
Exception thrown by subscriber method
renew(org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.status.event.PrimaryStateChangedEvent)
on subscriber
org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator@467045c4
when dispatching event:
org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.status.event.PrimaryStateChangedEvent@7b691567
java.lang.NullPointerException
at
org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator.renew(ClusterContextManagerCoordinator.java:229)
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 java.util.Optional.ifPresent(Optional.java:159)
at
org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.GovernanceWatcherFactory.lambda$watch$0(GovernanceWatcherFactory.java:55)
at
org.apache.shardingsphere.mode.repository.cluster.zookeeper.CuratorZookeeperRepository.lambda$watch$1(CuratorZookeeperRepository.java:247)
```
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