We are runnning the Sun Java Application Server 7 Q2 and are looking to upgrade the JVM that is used, does anyone know what version this Sun server runs with? Is there any documentation that would indicate what is needing done to upgrade?
I suggest you look at upgrading your appserver7 install to the latest update 6 as well.
Speaking of upgrading just JVM, it is quite easy. If you upgrade jdk it would be picked up automatically from the same location.
If you change jdk directory, you have to modify AS_ROOT/config/asenv.conf and each of your servers server.xml files to point to your new jdk location.