Accessing WM from J2EE Application (ART?)


I am looking for documentation about the new 6.0 adapter runtime. Especially if there is a JCA client included for use from within our J2EE application (WLS 6.1 / 8.1).

Or more generally:
What are the possibilities to access WM from within a J2EE application?
I’ve seen the WLI adapter, the EJB Adapter… Which one is best?