Mit RXTX Daten von serieller Schnittstelle lesen

import gnu.io.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Enumeration;
 

public class RxTxTest {
	public static void main(String args){
		String wantedPortName = "/dev/ttyUSB0";  
		
		Enumeration portIdentifiers = CommPortIdentifier.getPortIdentifiers();
		
		CommPortIdentifier portId = null;  // will be set if port found
		while (portIdentifiers.hasMoreElements())
		{
		    CommPortIdentifier pid = (CommPortIdentifier) portIdentifiers.nextElement();
		    
		    System.out.println(pid.getName());
		    if(pid.getPortType() == CommPortIdentifier.PORT_SERIAL &&
		       pid.getName().equals(wantedPortName)) 
		    {
		        portId = pid;
		        break;
		    }
		}
		if(portId == null)
		{
		    System.err.println("Could not find serial port " + wantedPortName);  
		    System.exit(1);
		}
		
		SerialPort port = null;
		try {
		    port = (SerialPort) portId.open(
		        "name", // Name of the application asking for the port   
		        10000   // Wait max. 10 sec. to acquire port
		    );
		} catch(PortInUseException e) {
		    System.err.println("Port already in use: " + e);  
		    System.exit(1);
		}
		
		try {
			port.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
		} catch (UnsupportedCommOperationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.exit(1);
		}
		
		BufferedReader is = null;  // for demo purposes only. A stream would be more typical.

		try {
		  is = new BufferedReader(new InputStreamReader(port.getInputStream()));
		} catch (IOException e) {
		  System.err.println("Can't open input stream: write-only");  
		  is = null;
		}
		
		String my_buffer = "";  
		
		/////////////////////////////////////////////////////////////////////////////////////////
		/////////////////////////////////////////////////////////////////////////////////////////
		/*try {
			my_buffer = is.readLine();
		} catch (IOException e) {
			System.out.println("Fehler beim Lesen"); 
			//e1.printStackTrace();
		}*/
		/////////////////////////////////////////////////////////////////////////////////////////
		/////////////////////////////////////////////////////////////////////////////////////////
		
		if (is != null)
			try {
				is.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				//e.printStackTrace();
				System.out.println("IS ist bereits geschlossen");  
			}
		if (port != null) port.close();
		System.out.println("Fertig");  
	}
}

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f0c9c737462, pid=6442, tid=139692467468032
#
# JRE version: OpenJDK Runtime Environment (7.0_65-b32) (build 1.7.0_65-b32)
# Java VM: OpenJDK 64-Bit Server VM (24.65-b04 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [librxtxSerial.so+0x6462]  read_byte_array+0x52
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again  
#
# An error report file with more information is saved as:
# /home/matthias/workspace/SwissphoneClient/hs_err_pid6442.log
#
# If you would like to submit a bug report, please include
# instructions on how to reproduce the bug and visit:
#   http://icedtea.classpath.org/bugzilla
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Experimental:  JNI_OnLoad called.