FYI - The bundled version of tomcat v5.5 that comes with webFOCUS 7.65 may have a "buggy" dll. I say "may" because it might have been fixed already or it may just work for you. But anyway after days of trying to get tomcat to not stick at 100% CPU usage after dumping the CAR file, I found some info that points to a buggy tcnative-1.dll version 1.1.4. I downloaded a newer version 1.1.8 from
"http://tomcat.heanet.ie/native/1.1.8/binaries/win32/" and my problem was gone.

Thanks for sharing!