Thank you Petemuir for your help I'm using Jboss server (jboss-4.0.5.GA) and my TaskFormLibrary class appears only in the subdirectory jar of the exploded-archives folder, with the other classes of my session beans but not in the war subdirectory. Found no copy of facelets.jar. anonymous wrote : | Why not just use xml to set up your components? Could you show me how to use xml for my tag library ? Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4044720#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...