If you really want to break with traditional Java web dev then Lift is probably a good fit. It's really different from every other framework I've worked with..

If you really want to break with traditional Java web dev then Lift is probably a good fit. It's really different from every other framework I've worked with... In kind of a good but strange way. They have MVC and restful use patterns now but the original functional approach of the framework is very powerful, though it takes some getting used to.