IBM developerWorks have a new in-depth tutorial on creating an AJAX-enabled web application using Google Web Toolkit and Apache Geronimo(require registration) in two parts. The first part focus on running compiled GWT applications on Geronimo for retrieving stock quotes. The second part will show you how to make the stock quotes application more sophisticated and how to transform it into a stock portfolio application, leveraging both GWT and Geronimo. For system requirements you will need : Geronimo 2.0 with Tomcat, Java 5 or Java 6, Apache Jakarta implementation of JSTL 1.1, Google Web Toolkit (obviously), and Eclipse !! Isn't that too much for a simple stock quote application ?

...building Ajax-enabled Web applications is more difficult than building traditional Web applications. It involves lots of JavaScript and Dynamic HTML (DHTML) development. Quirks among different browsers-and even different versions of the same browser-further complicate things. The GWT is one of many Ajax frameworks that makes your job easier by using a novel approach that lets you write all of your code in the Java language and generates all the JavaScript for you