Please look at my presentation on Java heap tuning: http://www.cecmg.de/doc/tagung_2007/agenda07/24-mai/2b3-peter-johnson/ind... You need to use the command line options to gather garbage collection statistics and go from there. If it is true that your heap is filling up and major collection are not freeing it, then you have a leak in your application. You can use VisualVM to help you analyze that objects your app is not freeing up. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4197882#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...