how to write a 2D game by using GWT and html5.

I love GWT, but I think it's the wrong choice for a simple game. Take a look at my game: www.playgrape.com. I did it in jQuery using canvas. It has its own physics engine with collision detection, etc., and the total size of the game is less than 6kB (plus jQuery). Even a simple GWT app will get you over 300kB very quickly, even more with RequestFactory.

Unless you have a lot of complex data entities and a complicated UI (many different views, panels, popups), jQuery is a better option.

As for the third party libraries, I would not recommend any for a simple game. Libraries I looked at were heavy and geared for more complex games. Drawing on canvas is pretty simple.

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