[jboss-jira] [JBoss JIRA] (WFLY-10253) ConcurrentModificationException on startup

[Martin Herschke (JIRA)]

Martin Herschke created WFLY-10253:
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             Summary: ConcurrentModificationException on startup
                 Key: WFLY-10253
                 URL: https://issues.jboss.org/browse/WFLY-10253
             Project: WildFly
          Issue Type: Bug
          Components: JPA / Hibernate
    Affects Versions: 10.1.0.Final
            Reporter: Martin Herschke
            Assignee: Scott Marlow


standalone wildfly startup: This exception appears sporadically and is caused by different modules and projects.

Multiple threads are used to deploy modules ({{MSC service thread 1-7}}), but a static method {{lookupProvider}} is called. The provider list is a normal ArrayList that causes the exception.

{code}
16:36:23,604 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC000001: Failed to start service jboss.deployment.subunit."<our_ear>"."<our_module>".FIRST_MODULE_USE: org.jboss.msc.service.StartException in service jboss.deployment.subunit."<our_ear>"."<our_module>".FIRST_MODULE_USE: WFLYSRV0153: Failed to process phase FIRST_MODULE_USE of subdeployment "<our_module>" of deployment "<our_ear>"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:154)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at org.jboss.as.jpa.processor.PersistenceUnitServiceHandler.lookupProvider(PersistenceUnitServiceHandler.java:940)
at org.jboss.as.jpa.processor.PersistenceUnitServiceHandler.nextPhaseDependsOnPersistenceUnit(PersistenceUnitServiceHandler.java:1052)
at org.jboss.as.jpa.processor.PersistenceUnitServiceHandler.deploy(PersistenceUnitServiceHandler.java:136)
at org.jboss.as.jpa.processor.PersistenceBeginInstallProcessor.deploy(PersistenceBeginInstallProcessor.java:52)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:147)
... 5 more
{code}



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