Problème avec rrd4j et générer des images

Bonjour,
je suis entrain de développez une application permettant de faire un graphique contenant la progression de la bande passante utilisé
pour cela j'ai fait une classe pour l'envoie de requete snmp et récupere le taux la valeur du download en entier.
j'ai ecrit ces deux classe pour faire le graph mais mon probleme c'est que j'ai l'image au format .png mais je n'ai aucune courbe.
qui pourrait résoudre mon probleme ?????
aidez moi svp

cette classe permet le lancement du thread et générer le graph

Code:

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package SNMP;
 
import static org.rrd4j.ConsolFun.AVERAGE;
import static org.rrd4j.ConsolFun.MAX;
 
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Calendar;
import java.util.GregorianCalendar;
 
import javax.management.timer.Timer;
 
import org.rrd4j.ConsolFun;
import org.rrd4j.DsType;
import org.rrd4j.core.FetchData;
import org.rrd4j.core.FetchRequest;
import org.rrd4j.core.RrdDb;
import org.rrd4j.core.RrdDef;
import org.rrd4j.core.Sample;
import org.rrd4j.core.Util;
import org.rrd4j.graph.RrdGraph;
import org.rrd4j.graph.RrdGraphDef;
 
 
 
 
public class kkkkkk {
	static final String Chemin ="D:/Mes documents/9raya/Niveau/RI5/rrd/";
	static String file = "test";
	static final int IMG_WIDTH = 500;
	static final int IMG_HEIGHT = 300;
	static java.util.GregorianCalendar calendar = new GregorianCalendar();
	static final long Start_time  = calendar.getTimeInMillis();
	static long End_time ;
	static Sample sample;
 
	public kkkkkk() {
		// TODO Auto-generated constructor stub
	}
 
	/**
         * @param args
         * @throws IOException 
         * @throws InterruptedException 
         */
	public static void main(String[] args) throws IOException, InterruptedException {
		// TODO Auto-generated method stub
 
		String rrdPath = Chemin+file+".rrd";
		String imgPath = Chemin+file+ ".png";
		RrdDef rrdDef = new RrdDef(rrdPath);
		rrdDef.setStartTime(Start_time);
		rrdDef.addDatasource("speed", DsType.COUNTER, 600, Double.NaN, Double.NaN);
		rrdDef.addArchive(ConsolFun.AVERAGE, 0.5, 1, 24);
		rrdDef.addArchive(ConsolFun.AVERAGE, 0.5, 6, 10);
		RrdDb rrdDb = new RrdDb(rrdDef);
		sample = rrdDb.createSample();
 
		//int [] f = new int[] {1,3,6,1,2,1,2,2,1,10,1};
		//EnvoieRequete m= new EnvoieRequete("udp:127.0.0.1/161","public",f);
		//int Result =m.SendRequest("udp:127.0.0.1/161","public",f);
 
		Thread thread = new Thread(new classeRunnable(), "Thread de test");
		int i =0;
		do
		{
			thread.run();
			thread.sleep(1000);
			i++;
		}while(i<100);
		//thread.stop();
		System.out.println("apré thread.stop");
		//time2=sample.getTime();
		//thread.destroy();
		FetchRequest fetchRequest = rrdDb.createFetchRequest(ConsolFun.AVERAGE, Start_time,End_time);
		FetchData fetchData = fetchRequest.fetchData();
		fetchData.dump();
		rrdDb.close();
		RrdGraphDef graphDef = new RrdGraphDef();
		graphDef.setTimeSpan(Start_time,End_time);
		graphDef.datasource("myspeed", rrdPath, "speed", ConsolFun.AVERAGE);
		graphDef.line("myspeed", Color.black, null, 2);
		graphDef.setFilename(imgPath);
		RrdGraph graph = new RrdGraph(graphDef);
		BufferedImage bi = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
		graph.render(bi.getGraphics());
}
}

cette classe contient le corp du thread et sa methode run()

Code:

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package SNMP;
 
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Time;
import java.util.GregorianCalendar;
 
import org.rrd4j.core.RrdDb;
import org.rrd4j.core.RrdDef;
import org.rrd4j.core.Sample;
 
public class classeRunnable implements Runnable {
		public classeRunnable()
		{		
		}
 
		public void run()
		{
 
				int in=0;
				int [] f = new int[] {1,3,6,1,2,1,2,2,1,10,1};
				EnvoieRequete m= new EnvoieRequete("udp:127.0.0.1/161","public",f);
				java.util.GregorianCalendar calendar = new GregorianCalendar();
				kkkkkk.End_time = calendar.getTimeInMillis();
				try {
					in = m.SendRequest("udp:127.0.0.1/161","public",f);
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				try 
				{
					kkkkkk.sample.setTime(kkkkkk.End_time);
					kkkkkk.sample.setValues(in);
					kkkkkk.sample.update();
 
				}
				catch (IOException e) 
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				System.out.println("in   "+in);
		 }
}