Arduino + java addeventlissener issue

Hey,
I'm followed/copypasted this arduino tutorial about java Arduino Playground - Java

I setted everthing right for my system(the port and my classname is different) but I'm getting a error on the line:
serialPort.addEventListener(this); //line 69

I'm getting this error in netbeans

method addEventListener in class gnu.io.SerialPort cannot be applied to given types;
required: gnu.io.SerialPortEventListener
found: serial.reader.SerialReader
reason: actual argument serial.reader.SerialReader cannot be converted to gnu.io.SerialPortEventListener by method invocation conversion

the code I have right now is

package serial.reader;

import java.io.InputStream;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier; 
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent; 
import gnu.io.SerialPortEventListener; 
import java.util.Enumeration;


public class SerialReader {
    SerialPort serialPort;
    
    private static final String PORT_NAMES[] = { 
			"/dev/tty.usbmodemfa131", // Mac OS X
			"/dev/ttyUSB0", // Linux
			"COM3", // Windows
			};
    /** Buffered input stream from the port */
	private InputStream input;
	/** The output stream to the port */
	private OutputStream output;
	/** Milliseconds to block while waiting for port open */
	private static final int TIME_OUT = 2000;
	/** Default bits per second for COM port. */
	private static final int DATA_RATE = 9600;
    /**
     * @param args the command line arguments
     */
        public void initialize() {
		CommPortIdentifier portId = null;
		Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

		// iterate through, looking for the port
		while (portEnum.hasMoreElements()) {
			CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
			for (String portName : PORT_NAMES) {
				if (currPortId.getName().equals(portName)) {
					portId = currPortId;
					break;
				}
			}
		}

		if (portId == null) {
			System.out.println("Could not find COM port.");
			return;
		}

		try {
			// open serial port, and use class name for the appName.
			serialPort = (SerialPort) portId.open(this.getClass().getName(),
					TIME_OUT);

			// set port parameters
			serialPort.setSerialPortParams(DATA_RATE,
					SerialPort.DATABITS_8,
					SerialPort.STOPBITS_1,
					SerialPort.PARITY_NONE);

			// open the streams
			input = serialPort.getInputStream();
			output = serialPort.getOutputStream();

			// add event listeners
                        
                        //Getting error on this line,
			serialPort.addEventListener(this);
                        
                  
                        /*
                         * method addEventListener in class gnu.io.SerialPort cannot be applied to given types;
                         * required: gnu.io.SerialPortEventListener
                         * found: serial.reader.SerialReader
                         * reason: actual argument serial.reader.SerialReader cannot be converted to gnu.io.SerialPortEventListener by method invocation conversion
                         */
                        
  
                        
                        
			serialPort.notifyOnDataAvailable(true);
		} catch (Exception e) {
			System.err.println(e.toString());
		}
	}

	/**
	 * This should be called when you stop using the port.
	 * This will prevent port locking on platforms like Linux.
	 */
	public synchronized void close() {
		if (serialPort != null) {
			serialPort.removeEventListener();
			serialPort.close();
		}
	}

	/**
	 * Handle an event on the serial port. Read the data and print it.
	 */
	public synchronized void serialEvent(SerialPortEvent oEvent) {
		if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
			try {
				int available = input.available();
				byte chunk[] = new byte[available];
				input.read(chunk, 0, available);

				// Displayed results are codepage dependent
				System.out.print(new String(chunk));
			} catch (Exception e) {
				System.err.println(e.toString());
			}
		}
		// Ignore all the other eventTypes, but you should consider the other ones.
	}

	public static void main(String[] args) throws Exception {
		SerialReader main = new SerialReader();
                
		main.initialize();
		System.out.println("Started");
	}
}

I don't have any super java powers (yet)
kind off beginner with java
I'm using netbeans on a Mac OSX 10.7.2 (OSX Lion)

can someone tell me whats wrong with this line and how I can fix it?