Jfree exception

import java.sql.*;
import org.jfree.chart.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.xy.*;
import org.jfree.data.*;

public class Chart{
public static void main(String arg[])throws Exception{
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123" );
        Statement st=conn.createStatement();
        ResultSet rs=st.executeQuery("SELECT * from cricket_match");
  XYSeries series = new XYSeries("");
  while(rs.next()){

  series.add((double)rs.getInt("runs"),(double)rs.getInt("overs"));
  }
  XYDataset xyDataset = new XYSeriesCollection(series);
  JFreeChart chart = ChartFactory.createXYLineChart
  ("Match_Score", "Runs", "Overs", xyDataset, PlotOrientation.VERTICAL, true, true, false);
  ChartFrame frame1=new ChartFrame("",chart);
  frame1.setVisible(true);
  frame1.setSize(300,300);
  }
}

while running the program.......

Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:169)
        at Chart.main(Chart.java:11)
Java Result: 1

i compiled the jfree program,,compiled without errors..but while running the program i got this message..what is this.

January 17, 2012 at 12:04 PM

Have you imported your MySQL jdbc driver library into your jdk?