hibernate.jar should be on the seam-gen classpath anyway. But put both in seam-gen/lib View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4100147#4100147 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4100147