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Between this and GWT (and the Google Wave app they are going to open source), I'm getting pretty interested in Java and using tools like GWT to just generate all of the javascript etc. It almost sounds like it will be /easier/ than Ruby on Rails.

Is that crazy?

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No I don't think so ... I actually found this library as I was watching the GoogleIO Wave Keynote. When I saw what the wave team did with GWT, compiling Java => Javascript became a viable option in my mind. Before the demo, it had always been a mystery to me as to why anyone would want to use such an absurd amount of abstraction.

In Vaadin you do not have to compile Java to JavaScript. Instead you are using native Java on server-side. GWT is used only for compiling "client-side thinclient". This is only needed when you want to add more widets to Vaadin - if you are happy with the default widgets you do not have to worry about GWT/browsers/compilation.

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