Hi Georgios, thanks for reporting this issue. The annotation processor does not yet support method/constructor constraints and thus cross-parameter constraints. Good to hear that you found a workaround for the time being.

That said, would you be interested in contributing a fix for this? The processor code base is quite straight-forward so it would be a great chance if you'd like to dive a bit into Hibernate Validator development If you're interested I could give you some guidance on the general design and how to get started.