Hi, On Mar 16, 2012, at 1:29 PM, Emmanuel Bernard wrote: the biggest problem is that we really want HV 4.3 being completely backward compatible. Implementing BV 1.1 would mean that we have to change some of the method level validation stuff. Really this would have to go into a HV 5 which in turn would mean we would need to create a branch and do parallel releases. Something I wanted to avoid. Really all the feature for method validation are already in place, just the API looks a little different. I could imagine that that we add things like ParameterNameProvider and implement the constructor validation methods. The methods would, however, still be hosted on org.hibernate.validator.method.MethodValidator. We can also try to get a HV 4.3 out asap just focusing on what's really required. Once it is out we start with HV 5 directly. Bottom line, HV 4.3 should work with BV 1.0 and any added features should be backwards compatible. Then w/ HV 5 we go BV 1.1. Personally I would like to avoid to work on two branches. Instead I would go for the second option where we maybe already add some things like ParameterNameProvider. --Hardy