Solution to detect and discard duplicate JMS messages

Question

Hi All,
          I have a scenario where in I require this scenario:
          Even though JMS messages are sent twice OR multiple times from JMS producer,as for as consumers are concerned,the JMS consumer should be able to detect and discard the message.
          Can somebody tell me how to achive the same?
          Thanks,
          Prashanth Bhat.

Answer 1

Funny - I was just talking to our product manager about exposing a "duplicate-elimination" feature in a future release. Anyhow, I think there are two solutions:
          (1) Use transactions on the producer side to guarantee it sends exactly-once. (Eg. The client uses the same tx to get its src message as it does to produce the messaage.) This is the standard solution - and, with batching, often turns out to be the highest performing solution (by far).
          (2) Modify the consumer to keep a history of received messages so that it can detect and discard duplicates. There's a white-paper on this topic here:
          High Performance Message Processing with BMT Message-Driven Beans and Spring
          http://dev2dev.bea.com/pub/a/2006/01/custom-mdb-processing.htm
          While the article specifically mentions "Spring", "Message-Driven Beans", and "BMT", the general concepts apply to any queuing system.
          Be sure to read through the comments. :)
          Tom