How to set up serial communication during processing in / dev / rfcomm0

I am trying to do serial communication between Ubuntu 12.04 and a JY-MCU bluetooth serial module connected to an Arduino.

I created this configuration in /etc/bluetooth/rfcomm.conf

rfcomm0 {
#   # Automatically bind the device at startup
    bind yes;
#
#   # Bluetooth address of the device    
    device 00:12:11:19:08:54
#   # RFCOMM channel for the connection
    channel 1;
#   # Description of the connection
    comment "Linvor Bluetooth Module";
}

I can use putty to communicate with the serial port / dev / rfcomm 0, and this works fine.

However, despite many attempts, I just don’t see how to create a serial port in processing that works in any way.

For instance:

println(Serial.list());

nothing output.

If I do:

String portName = "/dev/rfcomm0";
myPort = new Serial(this, portName, 9600);
println(myPort);

I see this on the monitor:

processing.serial.Serial@1712651

But if I then call:

 myPort.write('9');

I get an exception:

java.lang.NullPointerException
    at processing.serial.Serial.write(Serial.java:572)
    ...

I do not understand why this fails. I follow all the instructions from Tom Igoe's “Making Things Talk,” but that just doesn't work the way he says ...

Any help would be great!

Thank,

Bean