See Greg's tech tip on using Java technology for the server-side processing of AJAX interactions. He provides sample code for an autocomplete application and shows how to run on GlassFish.

Before Abhijit left as project lead, he and Sriramulu published a tech tip on Converting a POJO to a Persistent Entity. The example shows you how to convert a POJO (Plain Old Java Object) to a persistent entity, and how to use that entity from a Java Servlet. They also provide instructions for running on GlassFish along with alot of sample code in the tech tip itself.