Brian Walsh has written an article on Ajax CRUD with Struts 2 and TIBCO GI:

In this article you will learn how to create a new Ajax RIA front end to an existing Apache Struts2 .jsp application using TIBCO General Interface (GI), an open source Ajax toolkit with a MVC architecture similar to that of Java Swing. GI is optimized for creating business productivity applications and communicating with XML, SOAP, JSON and other types of services in a SOA.

Specifically we’ll extend the Struts2 CRUD (create, retrieve, update, delete) sample that comes with its installation to expose XML data services optimized for GI interoperation and create the Ajax application that connects the end user with those services though a rich graphical user interface. The intent behind this approach is to demonstrate how you can make incremental changes to existing applications rather than having to rewrite from scratch.