Welcome to OAuth for Spring Security!
As you can probably deduce from its name, the purpose of this project is to provide an OAuth implementation for Spring Security. Support is provided for the implementation of OAuth providers and OAuth consumers. There is also support for two-legged OAuth (a.k.a. "Signed Fetch") and for OAuth 2.0.
Applying security to an application is not for the faint of heart, and OAuth is no exception. Before you get started, you're going to want to make sure you understand OAuth and the problem it's designed to address. There is good documentation at the OAuth site and a good illustration of how OAuth is applied. You will also want to make sure you understand how Spring and Spring Security work.