my program is

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;

import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TwoWaySerialComm
{
    void bridge( String portName1, String portName2 ) throws Exception
    {
        CommPortIdentifier portIdentifier1 = CommPortIdentifier.getPortIdentifier(portName1);
        CommPortIdentifier portIdentifier2 = CommPortIdentifier.getPortIdentifier(portName2);

        if ( portIdentifier1.isCurrentlyOwned() || portIdentifier2.isCurrentlyOwned())
        {
            System.out.println("Error: Port is currently in use");
        }
        else
        {
            CommPort commPort1 = portIdentifier1.open(this.getClass().getName(),2000);
            CommPort commPort2 = portIdentifier2.open(this.getClass().getName(),2000);

            if ( commPort1 instanceof SerialPort && commPort2 instanceof SerialPort )
            {
                SerialPort serialPort1 = (SerialPort) commPort1;
                serialPort1.setSerialPortParams(57600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);

                InputStream in1 = serialPort1.getInputStream();
                OutputStream out1 = serialPort1.getOutputStream();

                SerialPort serialPort2 = (SerialPort) commPort2;
                serialPort2.setSerialPortParams(57600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);

                InputStream in2 = serialPort2.getInputStream();
                OutputStream out2 = serialPort2.getOutputStream();

                (new Thread(new SerialReader(in1, out2))).start();
                (new Thread(new SerialReader(in2, out1))).start();
            }
            else
            {
                System.out.println("Error: Only serial ports are handled by this example.");
            }
        }     
    }

    /** */
    public static class SerialReader implements Runnable 
    {
//Writer

        InputStream in;
        OutputStream out;

        public void SerialReader ( InputStream in, OutputStream out )
        {
            this.in = in;
            this.out = out;
        }

        public void run ()
        {
            byte[] buffer = new byte[1024];
            int len = -1;
            try
            {
                while ( ( len = this.in.read(buffer)) > -1 )
                {
                    out.write(buffer,0, len);
                    System.out.print(new String(buffer,0,len));
                }
            }
            catch ( IOException e )
            {
                e.printStackTrace();
            }            
        }
    }

    public static void main ( String[] args )
    {
        try
        {
            (new TwoWaySerialComm()).bridge("COM1", "COM3");
        }
        catch ( Exception e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

and i have installed the jnu.io package also but i am getting the error as

C:\Users\MAHESH\Desktop>javac TwoWaySerialComm.java
TwoWaySerialComm.java:40: error: constructor SerialReader in class SerialReader cannot be applied to
given types;
(new Thread(new SerialReader(in1, out2))).start();
^
required: no arguments
found: InputStream,OutputStream
reason: actual and formal argument lists differ in length
TwoWaySerialComm.java:41: error: constructor SerialReader in class SerialReader cannot be applied to
given types;
(new Thread(new SerialReader(in2, out1))).start();
^
required: no arguments
found: InputStream,OutputStream
reason: actual and formal argument lists differ in length
2 errors

C:\Users\MAHESH\Desktop>