Gpoker shows what you can do with the google web toolkit. It is a cool multiplayer no-limit Texas Hold’Em implementation with real-time chat. The front end is written with Java which the google web toolkit compiles to javascript. This is an impressive task that GWT does and so far, even though the toolkit is beta, seems seamless. The front end talks to a java servlet on the backend through an RPC layer on top of XMLHttpRequest. The server sends
events back to the clients through the same RPC mechanism so that the players at the table always have an updated rendering.

The layout which comes with a ajax chat, is pretty neat and easy to understand on the first look. Google Web toolkit blog talks about Ryan’s work here