title: OAuth 2.0 Open Source implementation in Java
body: <p>We will shortly build a prototype which will play the role of an OAuth client to interact with sites such as Facebook. A requirement is that we use OAuth 2.0 (knowing it is still in draft status). <br>
  Do you know of any Open Source Java implementations of an OAuth 2.0 client library?
  Our goal is to use it in our prototype, contributing to the project if possible.</p>