That's a pertinent point. Okay, I am not removing it just yet until I demonstrate validation in one of the example applications using (perhaps) Apache Commons Validator. The next drop of Taimen (0.1 Alpha-4) will still include the validators.
The idea behind removing the validator is to get rid of the dead weight. I started JWebMVC with the UNIX goal of doing one thing but doing it well -- so it may never become a complete solution for the MVC layer. It only provides the controller (C in MVC) and a flexible way to handle the controller-end scenarios. Remaining pieces such as validator, view layer, view tiling, Resource-oriented data layer etc can be integrated with Taimen or be built around it.
Regards,
Shantanu