It interfaces with the native tablet driver. I require C++ to interface with the tablet driver to read pressure, angle, orientation, etc from the pen.
Did you use JInput ? Other wise what are the supported systems ?
Wrote my own API, based on Wintab, so right now only Windows is supported.
In future, if there is enough interest in this project, I'll also write one to interface with XInput (Linux) and Cocoa (Apple), it shouldn't be hard anyway, but I don't have a Linux / Mac system to compile on right now.
However, although the tablet won't be recognized on Linux and Mac right now, the program still functions fine.