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Type: Bug
Resolution: Cannot Reproduce
Priority: Major
Fix Version/s: None
Affects Version/s: Future GA
Component/s: management, testing
Labels:
- flaky-test

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The test org.apache.activemq.artemis.tests.integration.management.QueueControlTest#testGetFirstMessage[durable=false] does occasionally fail with an NPE. The failure rate is about 1 in 500 executions. (It used to be more frequent in a checkout from last week.)

The weird thing is that the queueControl variable seems to become null due to activity of some thread in the background, while the test is doing its own thing. The println succeeded, but the call after that did not.

[...]
      // It's empty, so it's supposed to be like this
      assertEquals("[{}]", queueControl.getFirstMessageAsJSON());

      long beforeSend = System.currentTimeMillis();
      ClientProducer producer = session.createProducer(address);
      producer.send(session.createMessage(false).putStringProperty("x", "valueX").putStringProperty("y", "valueY"));

      System.out.println("first:" + queueControl.getFirstMessageAsJSON());

      long firstMessageTimestamp = queueControl.getFirstMessageTimestamp();  // <--- NPE here
[...]

[main] 18:39:24,062 INFO  [org.apache.activemq.artemis.core.server] **** start #test testGetFirstMessage[durable=false]() ***
[main] 18:39:24,063 INFO  [org.apache.activemq.artemis.core.server] AMQ221000: live Message Broker is starting with configuration Broker Configuration (clustered=false,journalDirectory=/home/jdanek/Work/repos/activemq-artemis/tests/integration-tests/./target/tmp/junit6121931814512757719/journal0-L,bindingsDirectory=/home/jdanek/Work/repos/activemq-artemis/tests/integration-tests/./target/tmp/junit6121931814512757719/bindings0-L,largeMessagesDirectory=/home/jdanek/Work/repos/activemq-artemis/tests/integration-tests/./target/tmp/junit6121931814512757719/large-msg0-L,pagingDirectory=/home/jdanek/Work/repos/activemq-artemis/tests/integration-tests/./target/tmp/junit6121931814512757719/page0-L)
[main] 18:39:24,063 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE
[main] 18:39:24,063 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-amqp-protocol]. Adding protocol support for: AMQP
[main] 18:39:24,063 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-stomp-protocol]. Adding protocol support for: STOMP
[main] 18:39:24,063 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-openwire-protocol]. Adding protocol support for: OPENWIRE
[main] 18:39:24,064 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-hornetq-protocol]. Adding protocol support for: HORNETQ
[main] 18:39:24,064 INFO  [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-mqtt-protocol]. Adding protocol support for: MQTT
[main] 18:39:24,067 INFO  [org.apache.activemq.artemis.core.server] AMQ221007: Server is now live
[main] 18:39:24,067 INFO  [org.apache.activemq.artemis.core.server] AMQ221001: Apache ActiveMQ Artemis Message Broker version 2.7.0-SNAPSHOT [localhost, nodeID=7125a371-9a60-11e8-94a9-a6b1a7c8b6a3] 
first:[{}]
[main] 18:39:24,076 INFO  [org.apache.activemq.artemis.core.server] AMQ221002: Apache ActiveMQ Artemis Message Broker version 2.7.0-SNAPSHOT [7125a371-9a60-11e8-94a9-a6b1a7c8b6a3] stopped, uptime 0.013 seconds
[main] 18:39:24,077 INFO  [org.apache.activemq.artemis.core.server] **** end #test testGetFirstMessage[durable=false]() ***

java.lang.NullPointerException
	at org.apache.activemq.artemis.tests.integration.management.QueueControlTest.testGetFirstMessage(QueueControlTest.java:313)
	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runners.Suite.runChild(Suite.java:127)
	at org.junit.runners.Suite.runChild(Suite.java:26)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:67)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

is incorporated by

ENTMQBR-1968 Stabilization of ActiveMQ Artemis upstream test suite

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