Can I use the latest version of Tomcat inside Sun's J2EE implementation?

The J2EE reference implementation ships with Tomcat. The classes for Tomcat are located inside the libj2ee.jar. If you wanted to use the latest version of Tomcat you would have to replace the classes in this archive.

This would of course not be supported.

[Does anyone have experience/advice about updating this JAR? -Alex]