Java(tm) Communication API for win32

I looked all over the java website for the java comm api for windows.... Can't find it... They have it for linux and solaris but no windows.
Is there anywhere on the net that I can get it, if it exists.
The file i'm looking for is javacomm20-win32.zip.
Thanks!

http://forum.java.sun.com/thread.jspa?threadID=682630&messageID=3994211

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About Java Communication API for Windows

hi
I'm studying Serial Communication in university.
I'd like to know the reason why we can't downlaod Java Communication API for Windows.
I confirmed Comm for Linux and Soralis, but I can't find Comm for Win.
Please tell me the reason if someone know.

For no particular reason Sun stopped supporting the windows version
of that package. I use rxtx which happens to allow for much faster
communication too.
The interface is identical to Sun's version, just the package differs: "gnu.io".
kind regards,
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Moderator Action:
This duplicate cross-post is locked.
Stay with your original post.
https://forums.oracle.com/thread/2602063
(... and your hijack reply to a third thread has been removed.)

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If you use version 2.0 of the rxtx library then it provides a complete implementation of the javax.comm package.
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// Try the following url
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Check this thread:
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I think you can do this using the version for Solaris/SPARC along with RXTX for Linux (do a search on google), also I think IBM did a JavaCOMM api for linux.

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hi
I installed the Java Communication API on win32 platform (as per the guidelines)
Now when I try to run the sample program 'Blackbox' for the serial port, I get an error (in fact an exception is generated inside main function in BlackBox.class file)
I tried the SimpleRead.java example but that too generated the same exception
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I tried running the sample BlackBox program provided for serial port and now it says
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I verified that both comm.jar and javax.comm.properties are in the <JDK>\lib directory.
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Error in the latest Java comm api for Linux

installed latest Java comm api for Linux, tried test application for the Sun package:
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Exception in thread "main" java.lang.ExceptionInInitializerError
at SimpleRead.main(SimpleRead.java:67)
Caused by: java.lang.NullPointerException
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... 1 more
What deis this message mean? How to make you serial port support work?

and what does this error message mean??
The package was installed accordingly to "Java(tm) Communications API Linux Installation Instructions":
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/usr/lib/libLinuxSerialParallel.so
$env|grep CLASS
CLASSPATH=<..skipped..>:/opt/commapi/jar/comm.jar:/opt/commapi/jar/commtest.jar
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/opt/jdk1.5.0_04/jre/lib/javax.comm.properties
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Hurry! Communication API's Application?

Hello everyone!
I have some questions for java.lang.object and javax.comm.*.
I have edited a serial communication program which use jb7.0e to act a serial equipment.
That program is used java's communication API. And I do it well in my computer.
But when I make it into application program, always has one error trouble me...:
java.lang.NullPointerException
at adx.SerialBean.WritePort(SerialBean.java:125)
at adx.App1.<init>(App1.java:51)
at adx.App1.main(App1.java:114)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.zerog.lax.LAX.launch(Unknown Source)
at com.zerog.lax.LAX.main(Unknown Source)
I send the SerialBean.java at the end of the message.
Would you show me a right way.
Waiting for your early reply!
Yours, telerich
2002-11-22
SerialBean.javaimport java.io.*;
import java.util.*;
import javax.comm.*;
public class SerialBean
static String PortName;
CommPortIdentifier portId;
SerialPort serialPort;
static OutputStream out;
static InputStream in;
SerialBuffer SB;
ReadSerial RT;
public SerialBean(int PortID)
PortName = "COM" + PortID;
public int Initialize()
int InitSuccess = 1;
int InitFail = -1;
try
portId = CommPortIdentifier.getPortIdentifier(PortName);
try
serialPort = (SerialPort)
portId.open("Serial_Communication", 2000);
} catch (PortInUseException e)
return InitFail;
try
in = serialPort.getInputStream();
out = serialPort.getOutputStream();
} catch (IOException e)
return InitFail;
try
serialPort.setSerialPortParams(19200,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e)
return InitFail;
} catch (NoSuchPortException e)
return InitFail;
SB = new SerialBuffer();
RT = new ReadSerial(SB, in);
RT.start();
return InitSuccess;
public String ReadPort(int Length)
String Msg;
Msg = SB.GetMsg(Length);
return Msg;
public void WritePort(String Msg1)
int c;
try
for (int i = 0; i < Msg1.length(); i++)
{System.out.print(Msg1.charAt(i));
out.write(Msg1.charAt(i));}
} catch (IOException e) {}
public void ClosePort()
RT.stop();
serialPort.close();
}

You do know what a NullPointerException is, right? In line 125, in the WritePort-method, you try to access a variable that is null. The way you have posted your code I can't see which line that is, so it's hard for me to say anything more, (use code tags next time) but it is probably something rather straigthforward that you have forgotten. Carefully check all variables you use in that line to see if they are really initialised.

Communication API and Linux

But... exists an implementation of Communication API for linux?

But... exists an implementation of Communication API
for linux?http://www.google.com/search?q=javacomm+for+linux
First hit:
Java Comm Serial API How-To for Linux
http://wass.homelinux.net/howtos/Comm_How-To.shtml
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Java(tm) Communication API for win32

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