I would be surprised, since that would mean a server roundtrip.
I was trying to find a way for client side validation as trinidad offers.
I read in JIRA that Gavin agreed with client side validation in Seam, so I am curious how to ;D
We don't have any support currently for client side validation based on Hibernate Validator annotations.
This is something that would be added to RichFaces, you can vote for the feature on the RichFaces future wiki page.