Part 1: Introduction to Jersey—a Standard, Open Source REST Implementation

This article is part 1 of a four-part series. It briefly introduces basic Representational State Transfer (REST) principles, and then quickly leaves theory in order to build a real-life sample application. We will use the new Java Platform, Enterprise Edition (Java EE) 6 standard to create a classical JavaServer Faces application, and we will study why this application does not follow the REST principles. Using NetBeans, we will then add a second, Jersey-based view on top of our application, which will run in parallel with the JavaServer Faces front end. We will then compare both approaches to determine their pros and cons.
http://www.oracle.com/technetwork/articles/java/jersey-part1-159891.html