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