I assume that min-poll-size and max-poll-size are typos and that you meant min-pool-size and max-pool-size. Are they also mistyped in *-ds.xml? The sizes are way too small - you need to increase them. Each active user requires at least one connection. By active user, I mean a user who has clicked on something in the portal and is waiting on a response (in other words, has a request active). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169901#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...