I suspect you ran out of perm space (where class objects are loaded). Try running the application with this option: -XX:+PrintHeapAtGC (redirect the output to a file, there could be a lot of it). You will then need to look at the heap sizes reported at each garbage collection to see if the perm space is running out of room. To adjust the perm space size, use the option: -XX:PermSize=, where is something like 128M. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4072599#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...