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

[Scott Marlow (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-10253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569366#comment-13569366 ] 

Scott Marlow commented on WFLY-10253:
-------------------------------------

[~mhk] Could you show us the contents of the EAR that you are deploying (output of "jar tf yourapp.ear" and also the contents of contained archives)?  Mostly I am curious if there are any persistence provider jars contained in the EAR and if yes, the location in the EAR.  I'm also interested in the location of the persistence.xml files in the EAR as well.  

This will help me understand why your hitting this and how to responde to [~swd847] point raised in [https://github.com/wildfly/wildfly/pull/11164] about symptoms of a different problem than the pr addresses.

Thanks!

> 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: Dmitrii Tikhomirov
>
> 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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