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

[Brian Stansberry (Jira)]

    [ https://issues.jboss.org/browse/WFCORE-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677817#comment-13677817 ] 

Brian Stansberry commented on WFCORE-3948:
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[~swd847] This seems like a general problem with AttachmentList. Unless AttachmentList was made thread-safe most any use of Attachable.getAttachmentList would need to synchronize on the returned object before reading, particularly iterating.

Was there something particular about this use case that made it stand out?

> 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
>            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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