This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The base code you need to have to get GWT working is a web "renderable" page which embeds the generated GWT<->JS (typically the auto generated nocache.js file)
You can have a servlet/jsp which pumps back this page, including the embedded JS