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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.

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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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