[jboss-jira] [JBoss JIRA] (WFCORE-3948) Potential race condition on deployment of EAR when Class-Path manifest entry is in use

[Scott Marlow (Jira)]

    [ https://issues.jboss.org/browse/WFCORE-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13818542#comment-13818542 ] 

Scott Marlow commented on WFCORE-3948:
--------------------------------------

{quote}All of my above discussion is wrong; all that's needed is for AttachmentList to be thread safe.{quote}
Do we need the AttachementList to be iteration (thread) safe as well? 
 As in [CopyOnWriteArrayList|https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html]?

Or is [SynchronizedList|https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#synchronizedList-java.util.List-] (not iteration thread safe) enough?

> Potential race condition on deployment of EAR when Class-Path manifest entry is in use
> --------------------------------------------------------------------------------------
>
>                 Key: WFCORE-3948
>                 URL: https://issues.jboss.org/browse/WFCORE-3948
>             Project: WildFly Core
>          Issue Type: Bug
>          Components: Server
>            Reporter: Stuart Douglas
>            Assignee: Brian Stansberry
>            Priority: Major
>
> Attachments#ADDITIONAL_MODULES is attached to the top level DU, but modified by sub deployments in ManifestClassPathProcessor#createAdditionalModule without any sort of synchronisation. This can result in ConcurrentModificationException when the list is read/written to by other sub deployments at the same time.



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