Resteasy is a JBoss.org project aimed at providing productivity frameworks for developing client and server RESTful applications and services in Java. It is mainly a JAX-RS implementation but you'll find some other experimental code in the repository.
The project page can be found here
The JAX-RS code is in the jaxrs directory.
After pulling down a clone of the Resteasy repository run
- Java Cryptography Extension JCE