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setting classpath in java (oracle) rt.jar rxtx? [solved]
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cwc
l33t
l33t


Joined: 20 Mar 2006
Posts: 824
Location: Tri-Cities, WA USA

PostPosted: Fri Feb 15, 2013 12:58 pm    Post subject: setting classpath in java (oracle) rt.jar rxtx? [solved] Reply with quote

[solved]
I found the location of the current jre
cwc@azzerare ~/newton-130227 $ java -version
java version "1.6.0_41"
Java(TM) SE Runtime Environment (build 1.6.0_41-b02)
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)

I'm still not quite sure how classpath get set with the ebuild.

How to I set the classpath for java(oracle). I'm using the portage ebuild
About 12 years ago I used to add the path and classpath manually in bashrc and I could "echo $CLASSPATH" and get back the path to the rt.jar
I also need to access the RXTXcomm.jar

azzerare ~ # java -version
java version "1.6.0_39"
Java(TM) SE Runtime Environment (build 1.6.0_39-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)

Here is the lcoation of the rt.jar
/opt/sun-jdk-1.6.0.39/jre/lib/rt.jar

I'm trying to compile and run some RXTX (used with an Arduino )code using Gentoo and LinuxMint.
Thanks

Code:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.util.Enumeration;


public class SerialTest implements SerialPortEventListener {
   SerialPort serialPort;
        /** The port we're normally going to use. */
   private static final String PORT_NAMES[] = { "/dev/ttyUSB0"};
   /**
   * A BufferedReader which will be fed by a InputStreamReader
   * converting the bytes into characters
   * making the displayed results codepage independent
   */
   private BufferedReader input;
   /** The output stream to the port */
   private OutputStream output;
   /** Milliseconds to block while waiting for port open */
   private static final int TIME_OUT = 2000;
   /** Default bits per second for COM port. */
   private static final int DATA_RATE = 9600;

   public void initialize() {
      CommPortIdentifier portId = null;
      Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

      //First, Find an instance of serial port as set in PORT_NAMES.
      while (portEnum.hasMoreElements()) {
         CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
         for (String portName : PORT_NAMES) {
            if (currPortId.getName().equals(portName)) {
               portId = currPortId;
               break;
            }
         }
      }
      if (portId == null) {
         System.out.println("Could not find COM port.");
         return;
      }

      try {
         // open serial port, and use class name for the appName.
         serialPort = (SerialPort) portId.open(this.getClass().getName(),
               TIME_OUT);

         // set port parameters
         serialPort.setSerialPortParams(DATA_RATE,
               SerialPort.DATABITS_8,
               SerialPort.STOPBITS_1,
               SerialPort.PARITY_NONE);

         // open the streams
         input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
         output = serialPort.getOutputStream();

         // add event listeners
         serialPort.addEventListener(this);
         serialPort.notifyOnDataAvailable(true);
      } catch (Exception e) {
         System.err.println(e.toString());
      }
   }

   /**
    * This should be called when you stop using the port.
    * This will prevent port locking on platforms like Linux.
    */
   public synchronized void close() {
      if (serialPort != null) {
         serialPort.removeEventListener();
         serialPort.close();
      }
   }

   /**
    * Handle an event on the serial port. Read the data and print it.
    */
   public synchronized void serialEvent(SerialPortEvent oEvent) {
      if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
         try {
            String inputLine=input.readLine();
            System.out.println(inputLine);
         } catch (Exception e) {
            System.err.println(e.toString());
         }
      }
      // Ignore all the other eventTypes, but you should consider the other ones.
   }

   public static void main(String[] args) throws Exception {
      SerialTest main = new SerialTest();
      main.initialize();
      Thread t=new Thread() {
         public void run() {
            //the following line will keep this app alive for 1000 seconds,
            //waiting for events to occur and responding to them (printing incoming messages to console).
            try {Thread.sleep(1000000);} catch (InterruptedException ie) {}
         }
      };
      t.start();
      System.out.println("Started");
   }
}


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