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https://issues.apache.org/jira/browse/TOMEE-2919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526112#comment-17526112
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Geeth Narayanan commented on TOMEE-2919:
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I have created a PR for it : https://github.com/apache/tomee/pull/868
> java.util.ConcurrentModificationException error deploying ear in TomEE Plus
> 7.1.4
> ---------------------------------------------------------------------------------
>
> Key: TOMEE-2919
> URL: https://issues.apache.org/jira/browse/TOMEE-2919
> Project: TomEE
> Issue Type: Bug
> Components: TomEE Core Server
> Affects Versions: 7.1.4
> Reporter: Michelle Solon
> Priority: Blocker
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This issue appears in Tomee 7.1.4 and is a blocker for our project to upgrade
> to 7.1.4. In the openejb-core-7.1.4 jar, some code that was in
> org.apache.open.ejb.assembler.classic.Assembler that is causing the ear file
> in the apps folder to fail on deployment.
> If i replace the openejb-core-7.1.4 jar with openejb-core-7.1.1 jar, I do not
> get the error.
> Here is the stacktrace on startup.
> Nov 04, 2020 6:46:58 PM org.apache.openejb.assembler.classic.Assembler
> buildContainerSystemNov 04, 2020 6:46:58 PM
> org.apache.openejb.assembler.classic.Assembler buildContainerSystemSEVERE:
> Application could not be deployed:
> /apps/our/application/applicationearNov112020
> org.apache.openejb.OpenEJBException: Creating application failed:
> /apps/our/application/applicationearNov112020: null at
> org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:1101)
> at
> org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:755)
> at
> org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:633)
> at org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:485)
> at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:150) at
> org.apache.openejb.OpenEJB.init(OpenEJB.java:307) at
> org.apache.tomee.catalina.TomcatLoader.initialize(TomcatLoader.java:247) at
> org.apache.tomee.catalina.ServerListener.lifecycleEvent(ServerListener.java:168)
> at
> org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
> at
> org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
> at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:137) at
> org.apache.catalina.startup.Catalina.load(Catalina.java:639) at
> org.apache.catalina.startup.Catalina.load(Catalina.java:662) at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498) at
> org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:302) at
> org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:472)Caused by:
> java.util.ConcurrentModificationException at
> java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)
> at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:752)
> at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:750)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042)
> at
> org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:829)
> ... 18 more
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