I just wrote a quick test, and rollback wouldn't work if pre-ack. So.. what' s the expected semantic of pre-ACK on transactions? IMIO, preACK should be ignored if SessionType = Transacted (and that should be of course documented): The test is committed as org.hornetq.tests.integration.jms.client.PreACKJMSTest The failing test is disabled_testPreACKTransactional. To run it you can simply remove the disabled. BTW: used this dev-list as the dev-forum is down (again). Clebert Suconic