Does Spring JtaTransactionManager automatically omit non-used resources per transactions from Two-Phase Commit?

As far as I know, Spring does not care about the XA but is just handling the XA TX manager as a generic JTA manager. So its up to the manager to do it's work when getting committed / rolled back. Spring does just ensure the call is done.

That's done by the same proxy implementation that is used by any other Spring TA proxy.

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