How about taking care of the conversion yourself, by letting the requestparam being just a String? A try-catch in your method takes care of any Exceptions, and some static code somewhere which you can call with params like the name of the reqparam, and some errorstring that it will set to the facesmessages? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042248#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...