Comm.jar not working in Applet but works in Eclipse

Question

Hello,
Please help me to read serial port data from Java Applet.
The below code working well and get data from weighing machine when we run in eclipse(Run Applet). But it now working when we use class file in Applet.
I think its security issue, but i still could not understand what we need to do.
I put the JOptionPane.showDialog and found that the code is crashing in line CommPortIdentifier.getPortIdentifiers(); (Not understood why try catch not working.)
I am using in Windows 7 environment.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.logging.Logger;
import javax.comm.*;
import javax.swing.*;
public class SimpleApplet extends JApplet {
public void init() {
JButton button = new JButton("Click me!");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {                 
     JOptionPane.showMessageDialog(SimpleApplet.this, "hello");
JOptionPane.showMessageDialog(SimpleApplet.this, Getdata());
add(button, BorderLayout.CENTER);
setBackground(Color.GRAY);
public String Getdata()
     try
          String drivername = "com.sun.comm.Win32Driver";
try
CommDriver driver = (CommDriver) Class.forName(drivername).newInstance();
driver.initialize();
catch (Exception e) { //just do nothing, it doesn't really matter
     Enumeration portList=null;
CommPortIdentifier portId;
SerialPort serialPort;
OutputStream outputStream;
try
     portList = CommPortIdentifier.getPortIdentifiers();
}catch(Exception ex)
     JOptionPane.showMessageDialog(SimpleApplet.this, "erorr:" + ex.getStackTrace().toString());
JOptionPane.showMessageDialog(SimpleApplet.this, "get port lsit");
          while(portList.hasMoreElements())
               portId = (CommPortIdentifier) portList.nextElement();
               if(portId.getPortType()== CommPortIdentifier.PORT_SERIAL)
                    if(portId.getName().equals("COM1"))
                         try
                              serialPort = (SerialPort) portId.open("WeightMachine",200);                              
                              serialPort.setSerialPortParams(1200, SerialPort.DATABITS_8, SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
                              outputStream = serialPort.getOutputStream();
                              InputStream mInputFromPort = serialPort.getInputStream();
                              outputStream.write("W".getBytes());
                              outputStream.flush();
                              Thread.sleep(500);
                              byte mBytesIn [] = new byte[20];
                              mInputFromPort.read(mBytesIn);
                              //mInputFromPort.read(mBytesIn);
                              String value = new String(mBytesIn);
                              mInputFromPort.close();
                              serialPort.close();
                              return value.replace("+00", "").replace(" Kg", "");
                         }catch(Exception ex)
                              return ex.getMessage();
          }catch(Exception ex)
               JOptionPane.showMessageDialog(SimpleApplet.this, "erorr last:" + ex.getStackTrace().toString());
          return "Not found";
Thanks in advance.
Avinash

Answer 1

959817 wrote:EJP wrote:959817 wrote:
it now working when we use class file in Applet.Define 'not working'.But when i run applet from browser from same machine its not working.That's not an answer. That's just a vague and pointless restatement of the original vague and pointless statement that I asked you to clarify.
When you take your car to a mechanic, do you just tell him it's 'not working'?