I'm developing a system using Hibernate with Annotations, and while I've seen plenty of doco about Validator Constraints, as far as I can tell there is none on validating across multiple properties.

For instance, I have a Class with a highBoundary Double, and a lowBoundary Double. While both are nullable in and of themselves, I want to specify that they can't BOTH be null. Is there any way of doing this with Hibernate Annotations?

Thanks in advance,
--Alan