JWebSwing - Yet another Java Web Framework
And oddly close to the only one that's only Java ...
Excepting NextApp's Echo and the likes, minus all the complexity of management deployment and control with them.
With the Core being built ground up - directly with Ajax, CometServer Push, Events, JQuery and Javascript:
Component creation becomes as simple as using Swing. Start styling your applications without thousands of lines of CSS, rather use a couple of lines of Java in a self contained class.
Use Adapters to register events, dynamically alter any component on a page with immediate rendering, Stylish Web Application Creation becomes a breeze.