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From "Jarek Gawor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (GERONIMO-4393) Duplicate Xid with multiple JVMs on single host - default impl needs some 'random' entropy
Date Wed, 04 Feb 2009 19:55:59 GMT

    [ https://issues.apache.org/jira/browse/GERONIMO-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12670437#action_12670437
] 

Jarek Gawor commented on GERONIMO-4393:
---------------------------------------

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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