Check server.log for the reasons of the rollback. It's probably there.
Other things to remember:
- if you use UserTransaction, either lookup EM after you called tx.begin() or call em.joinTransaction() at that point: the EM has no knowledge that you started the transaction and it needs to subscribe to the TxManager commit callbacks.
- you can't call em.getTransaction() for a JTA EM (see spec for this restriction).
- You can inject an EMF into a multi-treaded component and then create EM for the duration of the method call. Such em will be thread-safe, but you must close it in the finally block to avoid memory and resource leaks.
HTH,
-marina
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