One othing I noticed: Now if you don't close your jms connections or core client sessions you'll see a warning in the logs when it's closed at gc. You'll notice that *lots* of tests in the test suite are throwing warnings - in other words we have many poorly written tests that don't close connections properly! And yes you're right. If you don't close a connection, with the invm transport, it will keep a reference right through to the server and back which will mean whole servers won't be garbage collected. This should be fixed now (when I commit in the next few hours) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4249759#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...