So the HOWTO I just read says to add these JAVA_OPTS to the startup script:
-Dcom.sun.management.jmxremote=true
-Dcom.sun.management.jmxremote.port=[place port number here]
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
I did this and it works but Tomcat doesn't shut down and gives me
java.net.BindException: Address already in use
when I execute the shutdown script.