to make both my zwave and zigbee stick work I had to actually create symlinks for both of them as described in the link that @chris posted because just adding the ports to the extra java opts was not sufficient. This is what worked for me: Raspberry Pi - Make serial USB ports persistent via symlinks
but the whole thread is actually worth reading. Dont know if it will work that way with your stick as its two in one and I had two separate sticks but my problem was very similar otherwise.
Johannes
