As you are probably aware ColdFusion allows you to use the integrated J2EE sessions that are provided as part of the J2EE server (by enabling the Use J2EE session variables setting in ColdFusion Administrator).

Greg Murray, the Servlet specification lead is asking how do you use the Java Servlet API, and where would you like it to go:

As part of Java EE 5.0 servlets will be undergoing a maintenance release.

I like to setup my development machine with different versions ColdFusion, but all with the same web root. I setup a server for each instance, so I can use the same url on different ports (eg CFMX 6 on port 8600, CFMX 7 on port 8700, etc).