Thanks for the reply, I now understand more about the different ack-modes. 
However, my problem still remains. In order to get more to get more control of 
all commits and rollbacks I tried BMT instead, with the following code structure


  | public void onMessage(Message m) {
  |   log.debug("Start onMessage()");
  |   try {
  |     log.debug("Starting transaction");
  |     context.getUserTransaction().begin();
  |   } catch (Exception e) { log.error("Failed to start transaction"); }
  |   try {
  |      // do something that might fail
  |   } catch (HandledException he) {
  |     log.info("Caught HandledExcption, rolling back transaction")
  |     try {
  |       context.getUserTransaction().rollback();
  |     } catch (Exception e) { 
  |       log.error("Failed to rollback transasction " + e.toString()); 
  |     }
  |     return;
  |   } catch (IgnoredException ie) {
  |     log.error("Caught IgnoredException, ignoring");
  |   }
  |   log.debug("Commiting transaction");
  |   try {
  |     context.getUserTransaction().commit();
  |   } catch (Exception e) { 
  |     log.error("Failed to commit transasction: " + e.toString()); 
  |   }
  |   log.debug("End onMessage()");
  | }
  | 

And again, in the normal case, i.e. no exception is thrown it works ok and the 
transaction is commited. But if I provoke a IgnoreException the out put would 
be the following:


  | DEBUG  Start onMessage()
  | DEBUG  Starting transaction
  | ERROR  Caught IgnoredException, ignoring
  | DEBUG  Commiting transaction
  | ERROR  Failed to commit transaction: javax.transaction.RollbackException: 
Already marked for rollback
  | 
  | 
  | Why would the transaction already be marked for rollback in this case? I'm 
thinking there might be some transaction timeout? In my case it's a quite long 
transaction, +1 min. 
  | 
  | Does anyone have any idea on what might be going on here? 
  | 
  | Tnx
  | 
  | /Andreas

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