No longer able to extend CookieRetrievingCookieGenerator in Cas Server 3.2.1

[Steve Podell]

Hi Eric,
  I need to upgrade to CAS Server 3.2.1 to get a feature called "single 
sign out" that will notify RPro when it is time to sign out so RPro can 
do some cleanup for Muse/ICE (a 3rd party webapp).
  The problem I am having is that CookieRetrievingCookieGenerator is now 
defined as "public final class CookieRetrievingCookieGenerator extends 
CookieGenerator" -- the final is the killer, since we extend that class 
in public WebpacCookieGenerator.

   Can you think of any way to solve this problem short of modifying the 
CookieRetrievingCookieGenerator.java file and remaking the war?

Thanks,
Steve