...
In short, you write, test and debug your client-side code in Java and let GWT cross-compiler convert it all into cross-browser JavaScript. When compiled the Client-side is now pure JavaScript and HTML.
GWT Cross-Compiler compresses the JS naming and obsfuscates your code to the shortest possible length.
With GWIT With GWT you "Only pay for what you use!"
So, The GWT Cross-Compiler prunes unused classes, methods and attributes, from your code. In addition, the Cross-compiler compresses the JS naming and obsfuscates your code to the shortest possible length.
In fact, GWT can generate faster JavaScript than you can write by hand!
In the ideal world, the Java developer would never have to write JavaScript code.
This is the fulfilled promise of GWT...
GWT is all Java
Only one language : JAVA
...
The built-in library of UI components will look very familiar to Java developers, particularly those having Swing experience.
In the ideal world, the Java developer would never have to write JavaScript code.
This is the fulfilled promise of GWT...
Open Source and Community Initiative
...