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https://jira.codehaus.org/browse/MNG-5304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=301933#comment-301933
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Adrian Nistor commented on MNG-5304:
------------------------------------
Will try to create a sample test and also submit a patch very soon this week.
> maven-surefire-report-plugin fails some times with
> ConcurrentModificationException when running parallel TestNG
> ----------------------------------------------------------------------------------------------------------------
>
> Key: MNG-5304
> URL: https://jira.codehaus.org/browse/MNG-5304
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Sites & Reporting
> Affects Versions: 3.0.4
> Environment: Java version: 1.6.0_32
> Maven version: 3.0.4
> maven-surefire-report-plugin: 2.12
> TestNG: 5.14.10
> Reporter: Adrian Nistor
>
> I'm running TestNG tests in parallel and get this exception
> ConcurrentModificationException.
> My quick analysis is that at the end of the test the method
> TestSetRunListener.getAsString is accessing the list of captured output while
> another thread (a stray thread spawned by the test or a completely different
> concurrent test) generates some more console output causing an append to the
> list which results in ConcurrentModificationException.
> To fix this we need to ensure getAsString accesses the list atomically. A
> possible solution is to copy/clone the list before iterating over it.
> Here is the stakctrace I get.
> java.util.ConcurrentModificationException
> at
> java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> at java.util.AbstractList$Itr.next(AbstractList.java:343)
> at
> org.apache.maven.plugin.surefire.report.TestSetRunListener.getAsString(TestSetRunListener.java:209)
> at
> org.apache.maven.plugin.surefire.report.TestSetRunListener.testFailed(TestSetRunListener.java:168)
> at
> org.apache.maven.surefire.testng.TestNGReporter.onTestFailure(TestNGReporter.java:104)
> at org.testng.internal.Invoker.runTestListeners(Invoker.java:1796)
> at org.testng.internal.Invoker.runTestListeners(Invoker.java:1780)
> at org.testng.internal.Invoker.invokeMethod(Invoker.java:749)
> at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:846)
> at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1170)
> at
> org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
> at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
> at org.testng.TestRunner.runWorkers(TestRunner.java:1147)
> at org.testng.TestRunner.privateRun(TestRunner.java:749)
> at org.testng.TestRunner.run(TestRunner.java:600)
> at org.testng.SuiteRunner.runTest(SuiteRunner.java:317)
> at org.testng.SuiteRunner.access$000(SuiteRunner.java:34)
> at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:351)
> at
> org.testng.internal.thread.ThreadUtil$CountDownLatchedRunnable.run(ThreadUtil.java:147)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
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