As already mentioned in the user's mailing list the integration of the JSR 303 is problematic because the Tapestry validation mechanism is only aware of the value being validated. There is no chance to get the page or bean whose property is validated. I already started the integration of the JSR 303 in my project but was stuck. Let's discuss some ideas on integration of the JSR 303 without to break the API.
-- Best regards, Igor Drobiazko