anonymous wrote : With the first issue I wanted to know if a durable subscriber receives the published messages in the same order the sender had published them. Yes, the JMS spec defines that a messages must be delivered in the order they were sent. anonymous wrote : Moreover I wanted to know if a published message is received only once by a subscriber. This depends on your acknowledgement mode on the session, If you're using AUTO_ACKNOWLEDGE then yes. I would suggest giving a tutorial a read, the sun one is pretty good. http://java.sun.com/products/jms/tutorial/ View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4194563#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...