As per JIRA (http://jira.jboss.com/jira/browse/JBIDE-429?page=all) two of the argument tabs were misnamed, stop and twiddle. Start args were still start args though, so that is the correct place for it. Start args - vm args Because eclipse is launching jboss directly in its memory space, you need to start ECLIPSE with more memory first using standard -Xblahblah args (lemme see if I can find them for you). http://blog.xam.dk/archives/58-Tracking-down-causes-of-exceptions-in-Ecli... A good post by Max on debugging eclipse, you can use that to keep an eye on your memory and figure out what exactly is happening there. http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/java.html Java command options. You're going to want ot look at -Xmx and -Xms and start eclipse with those arguments. That should increase the memory available to eclipse, and thus to jboss (since jboss would be running in eclipse) Good luck. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4005418#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...