socket com3 port reader

i want to read com3 port

i install javax.com version 2.0

but i try to this code (SimpleRead.java) I use jdeveloper

output is :Process exited with exit code 0.

Could you help me to  can read port

import java.io.*;
import java.util.*;
import javax.comm.*;

public class SimpleRead implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;

    InputStream inputStream;
    SerialPort serialPort;
    Thread readThread;

    public static void main(String[] args) {
        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                // if (portId.getName().equals("COM1")) {
                if (portId.getName().equals("/dev/term/a")) {
                    SimpleRead reader = new SimpleRead();
                }
            }
        }
    }

    public SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {}
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {}
      try {
            serialPort.addEventListener(this);
      } catch (TooManyListenersException e) {}
        serialPort.notifyOnDataAvailable(true);
        try {
            serialPort.setSerialPortParams(9600,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {}
        readThread = new Thread(this);
        readThread.start();
    }

    public void run() {
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {}
    }

    public void serialEvent(SerialPortEvent event) {
        switch(event.getEventType()) {
        case SerialPortEvent.BI:
        case SerialPortEvent.OE:
        case SerialPortEvent.FE:
        case SerialPortEvent.PE:
        case SerialPortEvent.CD:
        case SerialPortEvent.CTS:
        case SerialPortEvent.DSR:
        case SerialPortEvent.RI:
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;
        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer = new byte[20];

            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                }
                System.out.print(new String(readBuffer));
            } catch (IOException e) {}
            break;
        }
    }
}
skychanAsked:
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skychanAuthor Commented:
import javax.comm.*;
import java.util.*;

public class gokdk {
  public static void main(String[] args) {
 
    Enumeration e = CommPortIdentifier.getPortIdentifiers();
  System.out.print(e.hasMoreElements());
    while(e.hasMoreElements())
 
      System.out.println(e.nextElement());
  }
}

print out : false
Mayank SPrincipal TechnologistCommented:
It seems that for some reason, getPortIdentifiers () is not returning what it should - what is the output of this:

CommPortIdentifier obj = CommPortIdenfier.getPortIdentifier ( "COM3" ) ;
CommPort port = obj.open ( "MyApplication", 100 ) ;
System.out.println ( port.getName () ) ;
Mayank SPrincipal TechnologistCommented:
Girionis, isn't this happening a little too often? 'That' recommendation was not followed ;-) I wonder how somebody would work this code out if their code does not look like the one I posted.
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