wolfstudy opened a new issue #4099: [flaky unit test] URL: https://github.com/apache/pulsar/issues/4099 **Describe the bug** ``` 2019-04-22\T\03:52:53.868 [ERROR] testUnsupportedBatchMessageConsumer(org.apache.pulsar.client.impl.BrokerClientIntegrationTest) Time elapsed: 1.36 s <<< FAILURE! java.lang.NullPointerException at org.apache.pulsar.client.impl.BrokerClientIntegrationTest.testUnsupportedBatchMessageConsumer(BrokerClientIntegrationTest.java:382) 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 org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124) at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:54) at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:44) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ``` when i run java unit tests of Jenkins, there will always be some strange mistakes. In java unit tests of pulsar, there are a lot of test cases that use the same topicName, I was wondering if it is related to this reason. ``` final String topicName = "persistent://my-property/my-ns/my-topic1"; ``` **Screenshots** 
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