[jboss-jira] [JBoss JIRA] (WFLY-13162) ConcurrentModificationException in WildFlyJobXmlResolver

[Hielke Hoeve (Jira)]

    [ https://issues.redhat.com/browse/WFLY-13162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997909#comment-13997909 ] 

Hielke Hoeve commented on WFLY-13162:
-------------------------------------

Thank you so much

> ConcurrentModificationException in WildFlyJobXmlResolver
> --------------------------------------------------------
>
>                 Key: WFLY-13162
>                 URL: https://issues.redhat.com/browse/WFLY-13162
>             Project: WildFly
>          Issue Type: Bug
>          Components: Batch
>    Affects Versions: 18.0.1.Final, 19.0.0.Beta3, 20.0.0.Beta1
>            Reporter: Hielke Hoeve
>            Assignee: Cheng Fang
>            Priority: Major
>             Fix For: 20.0.0.Beta1
>
>
> Because of a thread unsafe construction in WildFlyJobXmlResolver I am experiencing ConcurrentModificationExceptions while starting my EAR every so often. This is because every EJB of the EAR is processed by WildFlyJobXmlResolver in paralel threads. Even if it has no jbatch dependency or dependency to a EJB which does.
> This is not reproducable for every startup as it depends on the performance of the host machine, number of ejbs in ear, number of threads and thread timing.
> I have created an example project representing our project setup with which I am able to reproduce the issue using a default wildfly build. This test project contains 1 EJB with jbatch, a number of plain EJBs, a WAR which uses the jbatch EJB and an EAR.
> See below for the exception stacktrace.
> I have made a small fix for this issue @ https://github.com/hielkehoeve/wildfly/commit/82047233621c3e5bdbd45333ca4c5c04bfd0d2cb. The example test project can also be found there.
> {code:java}
> 08:32:30,164 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.deployment.subunit."project.ear"."project-d.jar".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.subunit."project.ear"."project-d.jar".POST_MODULE: WFLYSRV0153: Failed to process phase POST_MODULE of subdeployment "project-d.jar" of deployment "project.ear"
> 	at org.jboss.as.server at 10.0.0.Final//org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:183)
> 	at org.jboss.msc at 1.4.11.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1739)
> 	at org.jboss.msc at 1.4.11.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1701)
> 	at org.jboss.msc at 1.4.11.Final//org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1559)
> 	at org.jboss.threads at 2.3.3.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
> 	at org.jboss.threads at 2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
> 	at org.jboss.threads at 2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
> 	at org.jboss.threads at 2.3.3.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1363)
> 	at java.base/java.lang.Thread.run(Thread.java:834)
> Caused by: java.util.ConcurrentModificationException
> 	at java.base/java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)
> 	at java.base/java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:741)
> 	at java.base/java.util.AbstractCollection.addAll(AbstractCollection.java:351)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.merge(WildFlyJobXmlResolver.java:261)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.forDeployment(WildFlyJobXmlResolver.java:127)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.forDeployment(WildFlyJobXmlResolver.java:130)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.forDeployment(WildFlyJobXmlResolver.java:130)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.forDeployment(WildFlyJobXmlResolver.java:130)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.WildFlyJobXmlResolver.forDeployment(WildFlyJobXmlResolver.java:130)
> 	at org.wildfly.extension.batch.jberet at 18.0.0.Final//org.wildfly.extension.batch.jberet.deployment.BatchEnvironmentProcessor.deploy(BatchEnvironmentProcessor.java:78)
> 	at org.jboss.as.server at 10.0.0.Final//org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:176)
> 	... 8 more
> {code}



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