Here's a few resources that you might find useful.

Java resources
Java Specification Request 80 (JSR 80)
JSR 80 official development site
JSR 80/javax.usb FAQ
SourceForge project page for JSR 80

Other controllers
There are few other people that have created controllers for the missile launcher:
Scott Weston - Linux (Python and libusb)
Ian Jeffray - Linux (C and libusb)
Jonathan McDowell - Linux (C and libusb)

USB sniffer
USB Monitor for Windows