For those that aren't in the know about Java and Google, GWT is the Google Web Toolkit. It's a magical framework that turns Java into JavaScript, and wishes into rainbows. One cool feature is that you can write server rpc's that have the same interface in Java and JavaScript. This works great if you only intend to write your server in Java, or your clients in GWT. I didn't want that constraint, so I looked around and found RestyGWT, which does similar magic to allow you to call REST interfaces just like they were java methods.
I added the ability to send and receive overlay types, which get compiled to native javascript objects. Basically you use the JSON data returned via rest as is, rather than processing into a Java Object, which is a little more heavy weight. It's also useful in cases where the server and client don't share a codebase, or even the same language. Since you'd have to model the data in Java anyway, it might as well be an overlay type.
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