Okay, I think I reproduced it. The exception that the OP posted occurs on Tomcat 5.5.17 with a Seam 1.1.0GA registration example. For some reason, this version of tomcat will allow me to load up the registration page, but if I enter inputs "abcd" for all three form fields, you will see the exception. On Tomcat 5.5.20 as I stated in the post above, you will not even get that far. Not sure about JBoss. Hope this helps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000207#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...