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https://issues.apache.org/jira/browse/GERONIMO-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12670437#action_12670437
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Jarek Gawor commented on GERONIMO-4393:
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Committed the patch to txmanager trunk (revision 740839) and
branches/geronimo-txmanager-parent-2.1 (revision 740842).
> Duplicate Xid with multiple JVMs on single host - default impl needs some
> 'random' entropy
> ------------------------------------------------------------------------------------------
>
> Key: GERONIMO-4393
> URL: https://issues.apache.org/jira/browse/GERONIMO-4393
> Project: Geronimo
> Issue Type: Bug
> Security Level: public(Regular issues)
> Components: transaction manager
> Affects Versions: 2.1.3
> Environment: multiple JVMs on single machine
> Reporter: Gary Tully
> Fix For: 2.1.4, 2.2
>
> Attachments: GERONIMO-4393.patch
>
>
> the default generation of baseId in XidFactoryImpl is not sufficient for
> multiple JVMs on a single node. There needs to be some entropy in the form of
> a few Random bytes to ensure that ids are different because given a
> duplication of code, the hashCode of the XidFactoryImpl will not be unique
> across the JVMs and given a single node, the IP addresss will be shared.
> This emerged via https://issues.apache.org/activemq/browse/AMQ-1824 where the
> workaround was to pass in the baseId as a constructor arg via spring.
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