I also changed commons-collection from AS with the one from Seam lib, w/o success. :-( View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4087217#4087217 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4087217