This is a minimalistic & easy-to-use vrpn library for java,
providing the possibility to host a button server with an "unlimited" amount of buttons,
and as many analogs as you wish.
Find the Javadoc at worosom.github.io/java_vrpn/
It's based on the comp523android code from the official vrpn release, packed up to be used as a Java library.
I compiled the native library for Mac,
you can find the source to compile for other systems in src/jvrpn.
Original Android code on GitHub
Alexander Morosow, 2014