The javascript was not found because there was some problems with the context name. I had renamed the WAR to icefaces.war, but for some reason icefaces was trying to retrieve the Icefaces javascript from wrong web-context, localhost:8080/HelloWorldIcefacesSeamPortlet/xmlhttp/ when the real one was localhost:8080/icefaces/xmlhttp/. After renaming the WAR to HelloWorldIcefacesSeamPortlet.war it started to work ( i changed the name of the portlet also). I wonder how icefaces determines where to lookup the resources (javascript etc) it needs? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3992487#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...