NoSuchPortException using RXTX Java library on Windows?

Try adding rxtxSerial.dll

to

C:\Program Files\Java\jdk1.6.0_07\jre\lib\bin
                                      ^^^

      

        
        
        
      

    

You can also try an alternative solution specifically for Windows. There should be many available, you can get one of them from http://www.caerustech.com/JCommWin32.php

Schultz

Your system may not have COM4 or it is not available. It's hard to guess what might be wrong because you didn't send you the port initialization code - what you posted looks like shell code.

Here is my working initialization code using the javax.comm API (but using SerialPort from serialio.com):

// name comes from config and is "COM1", "COM2", ...
SerialPort port=(SerialPort)CommPortIdentifier.getPortIdentifier(name).open("YourPortOwnerIdHere",5000);      // owner and ms timeout
port.setSerialPortParams(bau,dtb,stb,par);
port.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN|SerialPort.FLOWCONTROL_RTSCTS_OUT);
port.enableReceiveTimeout(1000);

      

        
        
        
      

    

Hopefully this indicates that you are in the right direction.

I agree that your problem looks like a ClassCastException and not something else.

For windows, I use the "Java Serial Com Port Driver" at http://www.engidea.com/blog/informatica/winjcom/winjcom.html and it is much easier for me to set up.

In any case, you need the DLL in the BIN directory, not the LIB \ BIN as suggested. At least that's what works for me. I am using NetBeans and I also found it useful to put the jar and dll in different bin and lib \ ext folders in the JDK.

Note that if you have multiple versions of the JRE on your computer, you may not be using the one that you think you are using. Also, as a practical matter, I found it more useful to just copy both the jar and the dll to the different bin and lib \ ext folders. Makes it just paste, paste, paste.

For windows, I recommend "Java Serial Com Port Driver" because it solved my problems with USB serial ports. I had seizures with RXTX because it crashed when USB was unplugged. winjcom has solved this problem and others. It has very useful error exceptions.

Also, make sure your serial drivers are up to date. Downloading the update fixed my other error. -Stosh

I also had a problem when closing serialPort in serialEvent function. Maybe it's a deadlock issue where the close method is always waiting for the serialEvent block to complete. Starting a new thread to close the port worked for me.

As per your question, my code looks like this:

if (idPuerto == null)
{
            formulario = form;
            boolean encontrado = false;


            listaPuertos = CommPortIdentifier.getPortIdentifiers();

            while( listaPuertos.hasMoreElements() && encontrado == false )
            {
              idPuerto = (CommPortIdentifier)listaPuertos.nextElement();
              //System.out.println(idPuerto.getName());

              if( idPuerto.getPortType() == CommPortIdentifier.PORT_SERIAL )
              {
                if( idPuerto.getName().equals(RFIDBascApp.ComBasc) )
                {        
                    encontrado = true;
                    logger.AddInfoUser("Puerto serie encontrado");

                  }
                }
              }

      

        
        
        
      

    

You had NoSuchPortException

, so first of all go to all available ports!

import gnu.io.CommPortIdentifier;        
import java.util.Enumeration;  

public class ListAvailablePorts {  

    public void list() {  
        Enumeration ports = CommPortIdentifier.getPortIdentifiers();  

        while(ports.hasMoreElements()){  
            CommPortIdentifier port = (CommPortIdentifier) ports.nextElement();
            System.out.println(port.getName());
        }
    }  

    public static void main(String[] args) {  
        new ListAvailablePorts().list();  
    }  
}