Jdbc connectivity through applet problem urgent ASAP

Question

hi ,
am trying to connect to the oracle database through applet. it gives a classnotfound exception . the same code works for other applications but not through the applet . why ? any idea to get it worked.I need to use this applet in a jsp file . in jsp file it gives an SQLexception as : java.security.AccessControlException:access denied(java.util.PropertyPermission oracle.jserver.version read)
how do i get it solved . please help me.
here is the applet code :
import java.awt.*;
import javax.swing.*;
import java.lang.*;
import java.util.*;
import java.sql.*;
public class Dot extends JApplet
    int xinterval,yinterval;
     private String message = "Initializing";
  //  int xexp=-40,yexp=20;
    Vector result = new Vector();
    Vector result1 = new Vector();
     public void init()
     int max = 100;
     int min = -100;
     xinterval = max/10;
     yinterval = min/10;
     try{     
     Class.forName("oracle.jdbc.driver.OracleDriver");
     Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL","chandu","chandu");
     PreparedStatement ps = con.prepareStatement("select name,expression_level,functional_classification from viewall where subexperiment_id = SRB4delta");
     PreparedStatement ps1 = con.prepareStatement("select name,expression_level,functional_classification from viewall where subexperiment_id = SRB5delta");
    ResultSet rs = ps.executeQuery();
    ResultSet rs1 = ps1.executeQuery();
     while(rs.next()){
          String arr[] = new String [3];
          arr[1]=rs.getString(1);
          arr[2]=rs.getString(2);
        arr[3]=rs.getString(3);
          result.addElement(arr);
while(rs1.next()){
          String arr[] = new String [3];
          arr[1]=rs.getString(1);
          arr[2]=rs.getString(2);
        arr[3]=rs.getString(3);
          result1.addElement(arr);
     con.close();
     rs1.close();
     rs.close();
catch (Exception e)
              setError("SQLException: " + e);
     public void paint (Graphics g)
if (result == null) {
         g.drawString(message, 5, 50);
         return;
     for(int i = 0 ; i<=10;i++){
          String temp= String.valueOf(xinterval*i);
          String temp1=String.valueOf(xinterval*(10-i));
          g.drawString(temp,500+(50*i),510);
        g.drawString(temp1,480,(50*i));
         temp=String.valueOf(yinterval*i);
          temp1=String.valueOf(yinterval*(10-i));
        g.drawString(temp,480,500+(50*i));
        g.drawString(temp1,(50*i),510);
     g.drawLine(500,0,500,1000);
    g.drawLine(0,500,1000,500);
    Enumeration enum = result.elements();   
    Enumeration enum1 = result1.elements();   
     while (enum.hasMoreElements() & enum1.hasMoreElements()) {
       String arr[] = new String [3];
         String arr1[] = new String [3];
       arr = (String [])enum.nextElement();
      arr1 = (String [])enum1.nextElement();      
     String col = arr[2] ;
     if(col.equals("CC"))
          g.setColor(Color.red);
     else if(col.equals("CF"))
          g.setColor(Color.green);
     else if (col.equals("S"))
          g.setColor(Color.blue);
     else if (col.equals("T"))
          g.setColor(Color.gray);
     else if (col.equals("U"))
          g.setColor(Color.pink);
     else if (col.equals("M"))
         g.setColor(Color.magenta);
     else if (col.equals("E"))
        g.setColor(Color.yellow);
     else
         g.setColor(Color.black);
    int xexp = Integer.parseInt(arr[1]);
     int yexp = Integer.parseInt(arr1[1]);
    g.drawString("test",500,600);
     if(yexp<0 & xexp>0)
      g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp<0 & xexp<0)
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp>0 & xexp>0)
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp>0 & xexp<0){
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
    private synchronized void setError(String mess) {
     result = null;     
     message = mess;     
     repaint();
}

Answer 1

In contrast to what many people say in this forum, it is possible to have an unsigned applet access a database. You don't even have to manipulate the client's policy-file. The requirement is that the database is located on the same machine as the applet is downloaded from.There are however other things that can break this possibility. One is the database-driver itself.
In the case of Oracle we have tried using different versions of the driver. When using version 8.1.7 or 9.0.1 things work nicely, but when switching to version 9.2 it stops working. There is a question on OTN [1]. Let's see what Oracle has to say about it.
[1] Problem connecting using Oracle JDBC drivers