[jira] Resolved: (GERONIMO-4393) Duplicate Xid with multiple JVMs on single host - default impl needs some 'random' entropy

["Jarek Gawor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GERONIMO-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jarek Gawor resolved GERONIMO-4393.
-----------------------------------

    Resolution: Fixed
      Assignee: Jarek Gawor

> 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
>            Assignee: Jarek Gawor
>             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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