If each user request needs a database connection, then no 25 connection will not be enough. As far as I know, the BasicThreadPool is for use by services (for example, messaging might make use of it (though messaging could have its own thread pool), or if you use remote clients to connect with EJBs the EJBs could be run from threads in the thread pool), and not for web applications - the thread pool defined in server.xml is used for webb apps (servlets/JSPs) and thus also for any EBJs that the web apps call. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4222785#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...