I did some searching and ran across agimatic-validation by agimatic GmbH, a JSR-303 implementation in the works. It is published under the Apache 2.0 License. The Hibernate JSR-303 spec jar is currently listed as dependency, but using it with a Geronimo equivalent may be an option.
The JPA 2.0 expert group is looking to incorporate Bean Validation
(JSR-303). Right now, it looks like we might include it as an optional
feature. If a Bean Validation provider is available, then the JPA provider
should use it. Otherwise, it is not a requirement.
The RI is being developed by Redhat. There was an Apache Commons sandbox
started for a potential Bean Validator provider, but the activity has died
So, I'm wondering from an OpenJPA and OpenEJB perspective, what should we
do? I may be mistaken, but my guess is that the EJB spec is going to
contain a similar dependency on Bean Validation. I don't believe the RI
will be directly accessible to us via a Maven dependency. Does anybody know
of other Bean Validation provider implementations that are in plan?