Lately I have had the pleasure of working with Vaadin, which is the sexiest Java UI language I have ever seen.
To cut to the chase, have a play around with this very snazzy interactive demo of Vaadin. (written in Vaadin!)
For those of you still here, Vaadin is a framework for building web applications using pure Java. No need to learn another language or attempt to deal with Swing, just code! Furthermore, the web application is built on the fly by your server. This means you can directly call all your other Java services and fetch data without having to worry about serialisation!
No more data transfer objects, no more worrying about translating types and no more code that isn't Java. (And on a personal note, no more Adobe Flash Builder... HORRAY!)
If you want to find out more, I recommend their outstanding book, which is online and free! Did I mention the whole framework is totally free as well? It comes in like a single tiny jar file as well... stop reading and download it now!!!
