Thank you for the reply. Unfortunately, I've already seen that page. This is what it suggested: anonymous wrote : I'm inside the application server, how do I install the exception listener? | | * You don't need to for an MDB, JBoss does it for you. | * For anything else, you should be using the JMS resource adapter which also does it for you. | This project already does these. So basically, if in the application server, "This shouldn't happen" is the answer -- which doesn't really help! I still don't understand how the Hypersonic JMS backend would get a ping timeout at all! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973344#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...