Wicket - Yet Another Java Web Application Frameworks

nHome - Wicket

They say its simple and easy. Got component, even specialized ones such as date picker.

Support AJAX.

Here are some sites reffering to it :-

http://weblogs.java.net/blog/gfx/archive/2005/08/get_to_love_web.html
(This guy call it a candy bar. Damn Nice Post(TM) BTW)

http://www.javalobby.org/java/forums/t60786.html