Has anyone had any success running Tomcat as a service in a 64-bit Windows 2008 server environment for any of the rational products?

Yes I have ... just last week ..copied my local tomcat5w parameters directly in to window 2008 service worked perfectly ... we did however, have to download the 64bit versions of tomcat to accomplish this before it would work - replacing the existing with the new 64bit versions

How exactly did you replace the existing tomcat with the 64-bit version? Did you still use version 5.5? And where did you find the 64-bit version? I do not see a differentiation between 32/64 bit here: http://tomcat.apache.org/download-55.cgi.

Also, wouldn't changing the configuration leave it unsupported by IBM? Just a thought.

I have found a technote detailing this problem here:

http://www-01.ibm.com/support/docview.wss?rs=3488&context=SSCP65&dc=DB560&dc=DB520&uid=swg21404257&loc=en_US&cs=UTF-8&lang=en&rss=ct3488rational

The technote will refer you to install the 64-bit version of tomcat, but after you install the new tomcat it will direct you to an RTC technote:

http://jazz.net/library/techtip/72

This seemed to work for me just fine except for the fact that there was no jazz.log created in the tomcat/logs directory when started from the windows service. After digging around I found that if you:

- open the file C:\<install_directory>\server\conf\jazz\log4j.properties
- update the log4j.appender.file.File properties to be log4j.appender.file.File=C:/<install_directory>/server/logs/jazz.log

I've noticed that there are a few other logs that don't populate as well, but the jazz.log and catalina.out should be all you need.