Say.. you have a JMS Session, transacted... | Session consumerSess = conn.createSession(true, Session.SESSION_TRANSACTED); | MessageConsumer consumer = consumerSess.createConsumer(queue1); | conn.start(); | Say, an user now being aware of what he is doing calls message.acknowledge(); int count = 0; | while (true) | { | Message m = consumer.receive(200); | if (m == null) | { | break; | } | m.acknowledge(); // This is invalid, but I guess we should just ignore this call | count++; | } | ATM, a subsequent call to rollback is useless, as m.acknowledge already fired a transaction commit. Message javadoc states we should ignore the call to ack: "Calls to acknowledge are ignored for both transacted sessions and sessions specified to use implicit acknowledgement modes. " so.. what should we do on this case? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4221136#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...