javax.comm:Error instantiating class com.sun.comm.Win32Driver

**bbq** · 06-27-2007, 08:43 PM

I use winXP and JDeveloper as IDE
I have to communicate comm port from my computer with other port comm from the same computer.
The thing that I write with comm4, it has to be read by comm5.
I've downloaded javacomm20-win32 api and I've followed the instructions:
1.- C:\>copy c:\commapi\win32com.dll to c:\jdk1.1.6\bin
2.- C:\>copy c:\commapi\comm.jar c:\jdk1.1.6\lib
3.- C:\>copy c:\commapi\javax.comm.properties c:\jdk1.1.6\lib
4.- C:\>set CLASSPATH=c:\jdk1.1.6\lib\comm.jar

When I execute this program:

Java Code:

package Olentzero;

import java.util.Enumeration;

import javax.comm.CommPortIdentifier;

public class CoMBilaketa {
public static void main(String args[]) {
Enumeration ports =
CommPortIdentifier.getPortIdentifiers();
while (ports.hasMoreElements()) {
CommPortIdentifier port =
(CommPortIdentifier)ports.nextElement();
String type;
switch (port.getPortType()) {
case CommPortIdentifier.PORT_PARALLEL:
type = "Parallel";
break;
case CommPortIdentifier.PORT_SERIAL:
type = "Serial";
break;
default: /// Shouldn't happen
type = "Unknown";
break;
}
System.out.println(port.getName() + ": " + type);
}
}
}

this error appears:

Java Code:

java.io.IOException: Error instantiating class com.sun.comm.Win32Driver
com.sun.comm.Win32Driver
at javax.comm.CommPortIdentifier.loadDriver(CommPortI dentifier.java:239)
at javax.comm.CommPortIdentifier.<clinit>(CommPortIde ntifier.java:109)
at Olentzero.CoMBilaketa.main(CoMBilaketa.java:10)
Exception in thread "main" java.lang.UnsatisfiedLinkError: isSessionActive
at com.sun.comm.SunrayInfo.isSessionActive(Native Method)
at com.sun.comm.Portmapping.registerCommPorts(Portmap ping.java:155)
at com.sun.comm.Portmapping.refreshPortDatabase(Portm apping.java:100)
at javax.comm.CommPortIdentifier.<clinit>(CommPortIde ntifier.java:138)
at Olentzero.CoMBilaketa.main(CoMBilaketa.java:10)
Process exited with exit code 1.

any ideas?
any suggest?

**Jack** · 07-05-2007, 05:09 AM

java.lang.UnsatisfiedLinkError: isSessionActive
you don't have some library in the path

**bhujang09** · 02-06-2008, 03:31 PM

hello help

**Joe2003** · 02-07-2008, 10:41 PM

I spent ages trying to get it working, ended up using the rxtx class and was much better, still ended up writing tons of code to get it working

**talk_to_vivekmishra** · 05-23-2009, 07:19 AM

You need to put all these files in JRE's directories...then only it will work...i tried ur sample it worked.

**talk_to_vivekmishra** · 05-23-2009, 07:22 AM

Link for comm property file

jempeg.org/javax.comm.properties

**abhitabhjamankar.it** · 07-12-2010, 04:09 PM

http://www.cs.uml.edu/~fredm/courses...-javaxcomm.zip

Download files from above link and try.

**JosAH** · 07-12-2010, 05:24 PM

Sun's serial and/or parallel port communication support always has been a bit wobbly on MS Windows platforms and they have stopped the support for that platform. The alternative, the free RXTX package, works fine on that platform.

kind regards,

Jos