The growing interest in AJAX development brings to the flourish of tools and framework to simplify the developers work and augment their productivity. One of the most interesting of this tools is the Google Web Toolkit (GWT).

The Google Web Toolkit tries a visionary approach to AJAX development: write Java code and compile it in Javascript code for browser execution. This approach grants to Java developers to use their preferred tools and techniques to develop the application that will be converted in Javascript through the GWT compiler. Moreover, GWT provides a set of widgets (Panel, Menus, Buttons, Trees, etc.) to build quickly an interactive web page. There is another value in GWT, Google provides with it a simple RMI framework, based on JSON serialization, to make remote requests to Java servlets. The development cycle, as described on GWT site, is the next:

1. Use your favorite Java IDE to write and debug an application in the Java language, using as many (or as few) GWT libraries as you find useful.

2. Use GWT's Java-to-JavaScript compiler to distill your application into a set of JavaScript and HTML files that you can serve with any web server.

3. Confirm that your application works in each browser that you want to support, which usually takes no additional work.

The key value of a tool like GWT is that it gives the possibility to reduce the number of development errors that are common in Javascript development, simply because the code is written in an highly typed language like Java.

More information about GWT can be found in [11].