[jira] [Resolved] (AMQ-5953) XA Transaction 'XID:[...]' has not been started. xaErrorCode:-4 on MessageAck

["Gary Tully (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-5953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gary Tully resolved AMQ-5953.
-----------------------------
    Resolution: Fixed

fixed up the sync around get access to the shared xatransaction map

> XA Transaction 'XID:[...]' has not been started. xaErrorCode:-4 on MessageAck
> -----------------------------------------------------------------------------
>
>                 Key: AMQ-5953
>                 URL: https://issues.apache.org/jira/browse/AMQ-5953
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.12.0
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.13.0
>
>
> There is a sync issue in TransactionBroker, that can result in contention on the xatransaction map.
> The result is a get returning null for something present. So an Ack cannot resolve the corresponding transaction. 
> The error - transaction not started - xaErrorCode:-4
> Either a resize or unrelated remove op could cause inconsistency and presumably allow a transient null.
> Trying to reproduce reliably in a test case is elusive. 



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