Another issue with the shutdown hook I'm seeing with Hibernate testing is that the hook doesn't get removed in internalStop(). JBC should keep a ref to the hook and remove it in internal stop; otherwise: 1) The hook executes at vm shutdown even though the cache was previously stopped/destroyed. That currently just causes a DEBUG log, but it's prone to breakage. 2) Until that happens you've leaked a ref to the CacheImpl to the shutdown hook thread. Might want to make the hook impl a bit more sophisticated so internalStop() can check if it is executing -- i.e. don't call Runtime.removeShutdownHook if it is the hook itself that calls internalStop(). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112021#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...