I found this other thread: http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4158716 It seems that if you have valid connection checker, then basically the redeployment of the datasource would not really be needed. Sure, it might still be better to redeploy instead of waiting for every connection to have thrown an exception, but eventually the pool *should* recover automatically. Only. clearly it doesn't (or it doesn't always). The topic starter has a valid connection checker configured, so if I understand correctly those connections should have been closed and re-opened, shouldn't they? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4257153#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...