ya i am using hsqldb. The linkage error that i got was solved when i used jboss4.0.5.GA. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031565#4031565 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4031565