problem using seial port

[jeroen]

Hi,

For a project at school I need to read data from port COM2. I used som
examples from internet and created a project on it. Running the app it
looks like there is no COM port available.
This statment retuns null
System.out.println((CommPortIdentifier)portList.nextElement()); Tried
everything but something is missing.

selection of the code:
============================================
package talk2com;
import javax.comm.*;
import java.io.*;
import java.util.Enumeration;

public class Talk2Com {
//Construct the application
public Talk2Com(){
}

public static void main(String[] args) throws NoSuchPortException {
Enumeration portList = CommPortIdentifier.getPortIdentifiers();
System.out.println((CommPortIdentifier)portList.nextElement());
}
===================================================================

Thanks Jeroen
(e-mail address removed)

 

[Dale King]

Hi,

For a project at school I need to read data from port COM2. I used som
examples from internet and created a project on it. Running the app it
looks like there is no COM port available.
This statment retuns null
System.out.println((CommPortIdentifier)portList.nextElement()); Tried
everything but something is missing.

Usually the problem is that there are actually two runtimes installed when
you install Java. There is the one in the SDK for compiling and another
public one for running. The easiest way to handle this with JavaComm is to
simply install it into both places. So for example on Windows you might
install it in C:\j2sd1.4.2_03\jre and also in C:\Program
Files\Java\j2re1.4.2_03.