"jsbhangra" wrote : | Please tell what should i set the value of the preferred maximum pool size ? | This cannot be told instantly without looking into your application behavior .You need to perform the stress tests under heavy loads and see what connection pool count helps you . You application might be causing the connection leaks thus resulting in choking of the pool . look at this http://wiki.jboss.org/wiki/Wiki.jsp?page=CanJBossTellMeWhenIDontCloseACon... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064227#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...