We create a transacted session with: QueueSession session = conn.createQueueSession(true, -1); It means all the messages created in that session are apart of an atomic unit and there can be none interposing in that order. However the starting of a transacted session doesn't take a destination as a parameter. So it couldn't be blocking at this time, other destinations should be able to accept whatever messages they please. So is the transaction started when we call QueueSender senderJMS = session.createSender(Destination); or in fact is not really a transaction at all so other "transactions" started after this one but who finished before it, actualy get their group of messages before this transaction's group?
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