9. Instant Messenger Application

This chapter shows how to build the web-based Instant Messenger application. The application is a good example of building on top of a well-defined GWT-RPC interface. Every client that loads the application will connect to a servlet on the server and make method calls through RPC. Each client connects to the same server, so it is possible for clients to collaborate with each other. The chapter also looks at building an unobtrusive user interface that integrates well with an existing web page and that only presents information to the user when necessary. We close the chapter by seeing how events can be added to HTTP using GWT-RPC and how to integrate with server features that make event-based protocols ...

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