Principal in a servlet

In Jetspeed 2.1.3 I have a servlet that uses request.getUserPrincipal() to
determine if their is someone logged into Jetspeed or not. It works
perfectly.

I am in the process of upgrading to Jetspeed 2.2.2 and this is no longer
working. The request.getUserPrincipal() always returns null now. Is there
some configuration setting I need to change to get the principal to
populate in the standard servlet request? The servlet is running in the
same application as my portlets and I can see my other session attributes.

Is there some other way to determine if the user is logged in from a
servlet?

--
Michael Binette