I can spot two problems 1) If you specify a key, then you should be the value attribute of the selectOneMenu should point to a String setter method (in this or the action method convert it to an object). So this explains the first exception. 2) If you specify a converter then don't specify a key (that will just confuse things) Quite why you got the second exception, I'm not sure, but I would suspect a classloading exception - make sure the selectitems.jar is in the classpath of the ear, and the selectitems-ui.jar is in the classpath of the war. Btw I would recommend writing a custom converter to using a key. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000554#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...