codelipenghui opened a new pull request, #16010:
URL: https://github.com/apache/pulsar/pull/16010

   Fix https://github.com/apache/pulsar/runs/6833250379?check_suite_focus=true
   
   ```
   Error:  Tests run: 4, Failures: 1, Errors: 0, Skipped: 3, Time elapsed: 
9.736 s <<< FAILURE! - in 
org.apache.pulsar.broker.service.BrokerServiceBundlesCacheInvalidationTest
   Error:  
testRecreateNamespace(org.apache.pulsar.broker.service.BrokerServiceBundlesCacheInvalidationTest)
  Time elapsed: 0.223 s  <<< FAILURE!
   java.lang.NullPointerException
        at java.base/java.lang.String.getBytes(String.java:963)
        at 
org.apache.pulsar.client.impl.schema.StringSchema.encode(StringSchema.java:101)
        at 
org.apache.pulsar.client.impl.schema.StringSchema.encode(StringSchema.java:37)
        at 
org.apache.pulsar.client.impl.TypedMessageBuilderImpl.value(TypedMessageBuilderImpl.java:175)
        at org.apache.pulsar.client.impl.ProducerBase.send(ProducerBase.java:65)
        at 
org.apache.pulsar.broker.service.BrokerServiceBundlesCacheInvalidationTest.testRecreateNamespace(BrokerServiceBundlesCacheInvalidationTest.java:57)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:829)
   ```
   
   Not 100% sure what's going on for now, but looks like It's related to the 
concurrency issue in the class initialization. Just found some related 
information.
       
   
https://maven.apache.org/surefire/maven-surefire-plugin/examples/fork-options-and-parallel-execution.html#parallel-test-execution
       
   
https://github.com/testcontainers/testcontainers-java/issues/2939#issuecomment-649810918
   


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