This is what I'm working on:
>> THE REST WITH SPRING CLASSES

• Technical forum: rest-security google group
• Docs: Main wiki
• Continuous Integration: CI on Cloudbees

git clone git://github.com/eugenp/REST.git
cd REST
mvn install
mvn cargo:run -f sec/pom.xml

• next: start consuming the service like so: REST API: Consuming Examples with curl

REST Security is a Proof of Concept implementation of a RESTful Service.
The project also provides a reference implementation for:

• REST Discoverability and HATEOAS
  
• Basic and Digest Authentication
  
• ETag support
• support for Multiple Representations (on the same URIs) (JSON, XML)
  
• a full REST based Query Language for advanced filtering of resources
  
• Sorting and Pagination in REST
  
• Statelessness for REST with Spring
  
• full integration testing suites at every layer: unit tests, integration tests for the DAO and Service layers, integration tests against the REST service
  

The project uses the following technologies:

• web/REST: Spring 3.1.x
  
• marshalling: Jackson 2.x (for JSON) and XStream (for XML)
  
• persistence: Spring Data JPA and Hibernate 4.1.x
  
• persistence providers: h2, MySQL
• testing: junit, hamcrest, mockito, rest-assured
  

Link to the API Documentation

• Built on Cloudbees: REST Security Jenkins CI
  
  

• Discussion Group/Mailing List

• see the Eclipse wiki page of this project