*Problem*
```
Stacktrace
java.lang.NullPointerException
at
org.apache.pulsar.client.impl.ConsumerImpl.closeAsync(ConsumerImpl.java:696)
at
org.apache.pulsar.client.impl.ConsumerBase.close(ConsumerBase.java:284)
at
org.apache.pulsar.client.api.ServiceUrlProviderTest.testCreateClientWithAutoChangedServiceUrlProvider(ServiceUrlProviderTest.java:115)
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)
```
[ Full content available at: https://github.com/apache/pulsar/issues/2639 ]
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