Hi,
great to see that there are some integration attempts with Scala. Not sure how much I can help. You probably need to provide a little more context, because I don't know so much about Scala.
That said, it seems that you maybe need method/parameter level validation. That is currently not yet possible with Hibernate Validator and it is only a suggestion of the Bean Validation specification. We are working on method level validation under
HV-347. Gunnar has a POC ready and we should have this feature ready soon.
Not sure though if this is really your problem. Is it ;-) ?
--Hardy