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 - #31 by JGKK
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
