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It is GWT, so it is transpiled to JS. I remember when I first saw this project years ago, I was impressed. Back then GWT was the best choice for statically-typed, large JS project development IMO.
We just chopped GWT out of our project a month or so ago; I'll fully admit that I didn't know much about it, but every step of the way I felt like I was battling it - it ended up being easier, faster and more testable to write our own JS for the front-end.
Can a GWT app be served statically? Do you need a backend? Can't you just compile it to JS+HTML and be done?
It absolutely can and I have done it many times back in the day. Granted I have moved on to alternatives these days.