Every time you create a JBossMessaging connection, you're creating a Remoting bisocket connection, including a new BisocketClientInvoker.$PingTimerTask. When you close the JBM connection, the PingTimerTask should cancel itself. You're sure that you're closing the JBM connection? Now, the Timer that the PingTimerTasks are registered with is a static object, so I guess it's possible that the Timer is holding references to old PingTimerTasks. I don't know how you're profiling your test, but I know that with JProfiler you can see what's pointing to the PingTimerTasks and preventing them from getting garbage collected. Could you look into that? Thanks, Ron View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150201#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...