Michael you will have to provide more deatils... on architecure and how things work. As far Hibernate is concerned, Since Jboss uses Hiberbate for its Peristence (as Part of EJB 3.0.. ) - which means yr business layer is POJO based it should be easily portable in JBoss with minor changes. With yr web fron end - what are you using.... Are you using Servlets/JSP or any other framework like Struts or myfaces, than it shouldnt be a problems as well porting to JBoss 4.0 You will have to provide more details though..... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974757#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...