You can't use JBossWeb 2,1,x in JBoss 4.2.x you need a 2.0.x version. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175209#4175209 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4175209