Maybe it’s just me and my Vista, or my version of the Java Runtime (1.5.0_10) but anytime I get an iTunes upgrade (such as the recent version 8 which I just installed), the WSO2 Mashup Server fails to launch.  Hate that!  Now I don’t know much about Java and environment variables, but here’s what I do to solve this problem:

1. Right click on "Computer" and get properties, then select "Advanced System Settings…".  Or, open up the Control Panel and search for "environment variables" and select the "Edit the system environment variables" task.
2. Click on "Environment Variables."
3. Double click on the "CLASSPATH" variable and find the segment (separated by ‘:’) that contains QTJava.  Delete this path segment and close all the windows.

The Mashup Server should now launch fine.  Now back to work…