How to mitigate risk of duplicate messages on XA scenarios under impact?

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Issue

When JBoss Enterprise Application Platform (EAP) 6 is under external impact, like "high CPU" caused by another process and the application uses JMS in a XA scenario; Transactions can end in a heuristic state and/or messages get duplicated .

Environment

JBoss Enterprise Application Platform (EAP) 6
- HornetQ in XA scope

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