A.3. Acknowledgment Modes

The AckEquivExample.java program shows how the following two scenarios both ensure that a message will not be acknowledged until processing of it is complete:

  • Using an asynchronous receiver—a message listener—in an AUTO_ACKNOWLEDGE session
  • Using a synchronous receiver in a CLIENT_ACKNOWLEDGE session

With a message listener, the automatic acknowledgment happens when the onMessage method returns—that is, after message processing has finished. With a synchronous receiver, the client acknowledges the message after processing is complete. (If you use AUTO_ACKNOWLEDGE with a synchronous receive, the acknowledgment happens immediately after the receive call; if any subsequent processing steps fail, the message cannot be ...

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