Use DR#3 and put the backport-util-concurrent.jar from icefaces package into lib directory. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4039397#4039397 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4039397