"jchen0516" wrote : We found a problem on JMS. I am not sure if it is my configuration problem. I wrote a simple MDB. At client side, when I put a small size ObjectMessage into the queue, MDB works fine. Only one MDB pickups and processes the message for one time. However, when I put a big size ObjectMessage (~MB) into the queue and MDB needs to process a little longer for a message, I found there are serveral MDB which sequentially pick up the same message from the queue and process it. I wonder if I should set something for message persistence to solve this problem. | | btw, jboss is running on a linux environment. I can see many same session pool message for MeesageDriverBean. Does that multithread or multi-CPU cause the problem? But I doubt because it is running fine for the small size message. | | Thanks for your help in advance! | | ---------------------------------------------------- | This is the my-jbossmq-destinations-service.xml in jboss-4.0.2/server/default/deploy/jms directory | | | | mbean code="org.jboss.mq.server.jmx.Queue" | name="jboss.mq.destination:service=Queue,name=myQueue" | <depends optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager | /mbean> | | | ---------------------------------------------------------- | MDB is very simple. ZippingMessage contains a list of filename need to be zipped. When ZippingMessage is bigger, this MDB needs to process longer time on zipping. | | public void onMessage(Message arg0) { | | // TODO Auto-generated method stub | try { | | ObjectMessage om = (ObjectMessage) arg0; | ZippingMessage izm = (ZippingMessage) om.getObject(); | | // start zipping and wait it finished | ZipManager zipper = new ZipManager(); | zipper.setName(izm.getZipFilename()); | zipper.setFiles(izm.getItems()); | zipper.start(); | zipper.join(); | | } catch (Exception e) { | log.error("Unexpected exception: " + e.getMessage()); | }
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