Just in case somebody finds the same problem: following chopin and Gavin King´s suggestions I tried version 1.1.6 and everything works fine. There are a couple differences between Registration versions (a couple tags missing and declaring Log as static) that are not related with the validation problem. The main problem is that jboss-seam-registration.war generated by version 1.1.0 does not contain jboss-seam-ui.jar in WEB-INF directoy. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4022669#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...