[jboss-user] [JBoss Messaging] - Re: automatically truncate message table on server startup

[paul_da_programmer]

So would non-persistent messages still preserve the transactional integrity of the JMS transaction?

onMsg(...) {
  |    //performSomeDBOperation( ) // or any XA transactional operation
  |    ...biz throws an uncaught exception  which is propagated to the JMS container
  | }
  | 
Can I assume the DB updates would be automatically rolled back - regardless of whether the message was persisted is a XA resource like a DB? So is JMS itself is an XA transactional resource irrespective of how persistence is handled? If so, that's something I guess I've missed all of these years using JMS.
I assumed that JMS being a 'potential' XA resource was only because of it's persistence implementation - I assumed if no persistence is used (or a non-transactional persistence impl like a filesystem) then consistent JMS<->DB transactions couldn't be guaranteed.  

For so value added here's a good description:
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JMS6.html#wp81843

...from Sun's tutorial...
anonymous wrote : # You can use the setDeliveryMode method of the MessageProducer interface to set the delivery mode for all messages sent by that producer. For example, the following call sets the delivery mode to NON_PERSISTENT for a producer:
  | 
  | producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
  | 
  | # You can use the long form of the send or the publish method to set the delivery mode for a specific message. The second argument sets the delivery mode. For example, the following send call sets the delivery mode for message to NON_PERSISTENT:
  | 
  | producer.send(message, DeliveryMode.NON_PERSISTENT, 3,  10000);
  | 
  | The third and fourth arguments set the priority level and expiration time, which are described in the next two subsections. 


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