Jersey-app-engine-demo is a project mainly written in Java, based on the MIT license.
Demo application of Jersey running on Google App Engine
This is a demo application showcasing Jersey running on App Engine.
Thanks to http://blogs.sun.com/naresh/entry/running_the_jersey_webapp_on for initial setup.
More documentation on what you can do with Jersey is here:
http://docs.sun.com/app/docs/doc/820-4867/ggnxo?l=en&a=view