May I propose some extensions for registration functionality for the Booking example? 1. Implement Hibernate custom validator for checking password and re-entered password equality. Actually reference manual refers Hibernate custom validators, but there is no example. 2. Perform custom validation for the Username property (user already exists) and fill in message related to property, so it should appear next to input. I saw web2 apps that perform verification asynchronously - it's great. Chapter 9. JSF form validation in Seam doesn't cover complex validation topic. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4013600#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...