zrlw commented on issue #8993:
URL: https://github.com/apache/dubbo/issues/8993#issuecomment-939219910
eclipse交叉执行若干次SingleRegistryCenterInjvmIntegrationTest和SingleRegistryCenterDubboProtocolIntegrationTest单元测试之后，突然发现这两个测试类执行DubboBootstrap.getInstance().start()的结果都是zookeeper
not connected了：
```
java.lang.IllegalStateException: java.lang.IllegalStateException: zookeeper
not connected
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.prepareEnvironment(DefaultApplicationDeployer.java:637)
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.startConfigCenter(DefaultApplicationDeployer.java:266)
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.initialize(DefaultApplicationDeployer.java:195)
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.start(DefaultApplicationDeployer.java:538)
at
org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:230)
```
跟踪进去CuratorFrameworkImpl的blockUntilConnected方法，发现currentConnectionState的值一直是null，curator的事件驱动不运转了。
dubbo: 3.0 7c2f52d [3.0-Triple] support streamObserver cancel (#8946)
pom里配置的zookeeper: 3.4.13， curator: 4.1.0, curator-test: 2.12.0
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