Some open-source software I’ve created which you may find useful:
jvix is a Java wrapper around the VMWare VIX API.
It allows you to stop and start virtual machines within a VMware hypervisor, as well as perform other maintenance tasks.
JDBC driver for use by developers to help investigate and profile commands being sent to a database from a Java application. It doesn’t use AOP. vmaint is a set of scripts for developing on and maintaining virtual machines.