MDB rollback to Queues/Topics

Can somebody explain the MDB rollback behaviour in Queues and Topics.
My specific questions are:
1) When a MDB, listening to a Queue, performs a rollback, does the message go back to the head of the queue (assumption is that the message should go back to the head of the queue)? Is this somewhere in the spec? Seems like different providers have different interpretations, all the JMS providers do not gurantee this behaviour.
2) If we replace the queue with Topic, where does the message go on a rollback?
3) Where does the message go when there are multiple subscribers to the Topic? Can the other subscribers that did consume the message successfully get the message again, if a subscriber performs a rollback?
The JMS specification does not cover these situation very well, so we are left to the mercy of the JMS providers.
4) Can somebody share the experience in this context, if we are trying to build a 'JMS agnostic' solution, how should we handle this rollback?
Thanks

1. Its dependent on the JMS provider. In ActiveMQ 4.x it is replayed to the consumer a number of times before being placed on the head of the queue - so ordering is maintained if the message is successfully processed by the same consumer.
However ordering is often broken if the message is put back on the head of the queue if you have multiple consumers, since they compete for messages. Though if you have multiple consumers anyway, you often loose total ordering unless you use a technique like Exclusive Queues or Message Groups.
2. Typically it'll be replayed to the same consumer again. Most JMS providers provide a way to customize the redelivery policy; how many times will it be redelivered before sending to a dead letter queue, what is the replay exponential back off time etc.
3. Yes. Each topic subscriber gets their own copy of the message. It doesn't matter if one consumer does or does not process the message; other consumers are unaffected.
4. I'd just retry the operation and rely on the MDB/JMS providers dead letter queue and you should be fine.
BTW if ever you need a tool to browse the dead letter queues and maybe move messages from the dead letter queue back to the originating queue, you could try Hermes
http://www.hermesjms.com/
James
http://logicblaze.com/

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JMS Queue/Topic MDB

Es posible crear Queue/Topic diamicamente
Es posible crear los MDB dinamicamente.
de que manera se puede implementar.
gracias.

Hi Rolper
La capacidad de crear din�micamente un queue/topic depende de su abastecedor de JMS. La mayor�a de los abastecedores de JMS tienen un "API administrativo" para hacer esto - por ejemplo ArjunaMS (http://www.arjuna.com) proporciona un API comprensivo para crear queue y topics en runtime.
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With the following advice/information from
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Have you tried the SAP WebDispatcher. This should acomplish what you want.
http://help.sap.com/saphelp_nw04/helpdata/en/42/5cfd3b0e59774ee10000000a114084/frameset.htm

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http://download.oracle.com/docs/cd/E14571_01/integration.1111/e10231/adptr_jms.htm#CJAHAFGF
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Multiple Apps and Multiple Queues/Topics

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          "David Cherryhomes" <[email protected]> wrote in message
          news:[email protected]...
          >
          > In WL7, is it possible to have two applications both do the same JNDI
          lookup and get
          > different queues? This is possible with EJB's because Weblogic has its own
          local
          > JNDI lookup that the java:comp/env/ejb/XXX references, however you cannot
          do the
          > local lookup with JMS queues/topics. My situation is that I may have more
          than one
          > client on a given box, and the messages going into a queue are destined
          for specific
          > clients, but the programs are both looking up the same queue (e.g.,
          jms/UpdateCache).
          > Is the only way to do this through using filters? I don't want to make any
          code changes
          > from one client app to the next.

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To manage a queue's messages:
1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. In the Administration Console, navigate to the queue resource that you want to configure:
* Navigate to JMS Resources in System Modules
* Navigate to JMS resources in an application module
3. Click the Monitoring tab.
4. Select the check box next to the queue, and then click Show Messages to access the queue's JMS Messages table. You can then
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MDB rollback to Queues/Topics

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