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Java Comm API

Matthew Seibel
Greenhorn

Joined: Jan 12, 2006
Posts: 4
I am having trouble running the sample class included with Sun's Comm API.

I can compile the class SimpleRead.java (javac SimpleRead.java) in Linux.

/*
* @(#)SimpleRead.java 1.12 98/06/25 SMI
*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license
* to use, modify and redistribute this software in source and binary
* code form, provided that i) this copyright notice and license appear
* on all copies of the software; and ii) Licensee does not utilize the
* software in a manner which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind.
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
* ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
* LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
* SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
* BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
* HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
* OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control
* of aircraft, air traffic, aircraft navigation or aircraft
* communications; or in the design, construction, operation or
* maintenance of any nuclear facility. Licensee represents and
* warrants that it will not use or redistribute the Software for such
* purposes.
*/
import java.io.*;
import java.util.*;
import javax.comm.*;

/**
* Class declaration
*
*
* @author
* @version 1.8, 08/03/00
*/
public class SimpleRead implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;
InputStream inputStream;
SerialPort serialPort;
Thread readThread;

/**
* Method declaration
*
*
* @param args
*
* @see
*/
public static void main(String[] args) {
boolean portFound = false;
String defaultPort = "/dev/ttyUSB0";

if (args.length > 0) {
defaultPort = args[0];
}

portList = CommPortIdentifier.getPortIdentifiers();

while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals(defaultPort)) {
System.out.println("Found port: "+defaultPort);
portFound = true;
SimpleRead reader = new SimpleRead();
}
}
}
if (!portFound) {
System.out.println("port " + defaultPort + " not found.");
}

}

/**
* Constructor declaration
*
*
* @see
*/
public SimpleRead() {
try {
serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
} catch (PortInUseException e) {}

try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {}

try {
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {}

serialPort.notifyOnDataAvailable(true);

try {
serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {}

readThread = new Thread(this);

readThread.start();
}

/**
* Method declaration
*
*
* @see
*/
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {}
}

/**
* Method declaration
*
*
* @param event
*
* @see
*/
public void serialEvent(SerialPortEvent event) {
switch (event.getEventType()) {

case SerialPortEvent.BI:

case SerialPortEvent.OE:

case SerialPortEvent.FE:

case SerialPortEvent.PE:

case SerialPortEvent.CD:

case SerialPortEvent.CTS:

case SerialPortEvent.DSR:

case SerialPortEvent.RI:

case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;

case SerialPortEvent.DATA_AVAILABLE:
byte[] readBuffer = new byte[20];

try {
while (inputStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
}

System.out.print(new String(readBuffer));
} catch (IOException e) {}

break;
}
}

}


But when I try to run it (java SimpleRead) I get these errors:



Error loading LinuxSerialParallel: java.lang.UnsatisfiedLinkError: no LinuxSerialParallel in java.library.path
Exception in thread "main" java.lang.UnsatisfiedLinkError: isDevLink
at com.sun.comm.Unix.isDevLink(Native Method)
at com.sun.comm.PathBundle.add(PathBundle.java:108)
at com.sun.comm.PlatformPortBundle.<init>(PlatformPortBundle.java:44)
at javax.comm.CommPortIdentifier.<clinit>(CommPortIdentifier.java:138)
at SimpleRead.main(SimpleRead.java:67)


I can't really figure out how to get the shared library (LinuxSerialParallel) loaded. I did copy the libLinuxSerialParallel.so to the /usr/lib directory and it has the following permissions set for it;

-rw-r--r-- 1 root root 30882 2006-01-11 11:21 libLinuxSerialParallel.so.

I am using Java 1.5 update 6 SDK.
Ilja Preuss
author
Sheriff

Joined: Jul 11, 2001
Posts: 14112
Please don't crosspost. See http://www.coderanch.com/t/378850/java/java/Comm-API


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subject: Java Comm API