First, a few prerequisites. You need an installed Java Development Kit (JDK) of version 1.4 or later. As of this writing, using GWT distribution gwt-mac-1.2.22, you cannot use the Java 5 features such as generics or autoboxing with your client-side code, but you can certainly use the Java 5 JDK compiler as you write these classes.
The GWT developers released GWT Release Candidate (RC) 1.3 at the time we published this shortcut. This release is associated with the GWT open-source announcement, however, and did not provide any new functionality. The demo application was compiled and tested with gwt-mac-1.3.1 RC and the official gwt-mac-1.2.22 release.
You have to download and unpack the GWT framework. The download address is http://code.google.com/webtoolkit. You can download the framework for Windows, Linux, or Mac OS X.
The unpacked archive includes:
Now we're almost ready to start coding.