JCaptcha with GWT

Ant Kutschera wrote :
a colleague and i have written an article about GWT, which includes a description of how to integrate JCaptcha with GWT. The article and the free source code are at:

http://www.maxant.co.uk/whitepapers.jsp

The paper is called "Enterprise GWT: Combining Google Web Toolkit, Spring and Other Features to Build Enterprise Applications"