Thread: servlet applet communication

Hello...

Iam stucked with an exception while trying to communicate between applet and servlet.
the exception is
java.io.StreamCorruptedException:..
here are my files.. please give me a solution for this

applet is:

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.ArrayList;
import java.util.Vector;
import java.net.URL;
import java.net.URLConnection;
 
import javax.swing.JApplet;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
 
public class SampleApplet extends JApplet implements ActionListener,Serializable {
 
    private static final long serialVersionUID = 1L;
 
    //String[] table_names = { "one", "two", "three", "four" };
    String[] table_names;
    String[] col1_names = { "one1", "two1", "three1", "four1" };
    String[] col2_names = { "one2", "two2", "three2", "four2" };
    ArrayList tnamelist;
 
    private JComboBox box;
 
    private Container contentPane;
    private JPanel panel = null;
    private JList list;
 
 
    //@Override
    public void init() {
        send();
        recieve();
    }
    public void send()
    {
    try
        {
            URL url = new URL(getCodeBase(), "http://localhost:8086/prashanthi/DBServlet");
        // open a connection to the servlet
        URLConnection servletConnection = url.openConnection();
        // prepare for both input and output
        servletConnection.setDoInput(true);
        servletConnection.setDoOutput(true);
        // don't use a cached version of URL connection
        servletConnection.setUseCaches (false);
        servletConnection.setDefaultUseCaches (false);
        // set the content type to indicate that we're sending binary data
        servletConnection.setRequestProperty ("Content-Type", "application/octet-stream");
        servletConnection.connect();
        ObjectOutputStream outputToServlet = new ObjectOutputStream(servletConnection.getOutputStream());
        Vector v=new Vector();
        v.addElement("First string from Applet to Servlet");
        v.addElement("Second string from Applet to Servlet");
        outputToServlet.writeObject(v);
        outputToServlet.flush();
        outputToServlet.close();
        }
        catch (Exception ex)
        {
            System.out.println(ex);
        }
 
    }
    public void recieve()
{
try
{
URL servletURL = new URL("http://localhost:8086/prashanthi/DBServlet");
URLConnection servletConnection = servletURL.openConnection();
servletConnection.setDoInput(true);
servletConnection.setDoOutput(false);
servletConnection.setUseCaches (false);
servletConnection.setRequestProperty("Content-Type","application/octet-stream");
servletConnection.connect();
ObjectInputStream inputFromServlet=new ObjectInputStream(servletConnection.getInputStream());
ArrayList a=(ArrayList)inputFromServlet.readObject();
table_names=(String[])a.toArray(new String[tnamelist.size()]);
box = new JComboBox(table_names);
        box.addActionListener(this);
        contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(box, BorderLayout.NORTH);
//textField.setText(v.elementAt(0).toString());
}
catch(Exception e)
{
e.printStackTrace();
}
}
 
    public void actionPerformed(ActionEvent e) {
        if(list!=null)
        {
            contentPane.remove(list);
        }
        String item = (String) box.getSelectedItem();
        if (item.equals("one")) {
            list = new JList(col1_names);
        } else if (item.equals("two")) {
            list = new JList(col2_names);
        }
        list.addMouseListener(new MouseAdapter() {
 
            @Override
            public void mousePressed(MouseEvent e) {
                if (panel != null)
                    contentPane.remove(panel);
                panel = new JPanel();
                String value = (String) list.getSelectedValue();
                JLabel lvalue=new JLabel(value);
                if(lvalue!=null)
                {
                    panel.remove(lvalue);
                }
                panel.add(lvalue);
 
                //if (value.contains("one"))
                    //panel.add(new JLabel("Clicked One"));
                //else
                    //panel.add(new JLabel("Clicked Second One"));
 
 
                contentPane.add(panel, BorderLayout.SOUTH);
                contentPane.validate();
            }
        });
        System.out.println("SampleApplet.actionPerformed() " + item);
        contentPane.add(list, BorderLayout.CENTER);
        contentPane.validate();
    }
}
 
 
and my servlet is:
 
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Vector;
import java.sql.*;
public class DBServlet extends HttpServlet implements Serializable
{
    Connection con=null;
    Statement st=null;
    ResultSet rs=null;
    ArrayList tnlist;
    String s=null;
    public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
    {
        doPost(req,res);
    }
    public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
    {
        tnlist=new ArrayList();
        res.setContentType("text/html");
        PrintWriter out=res.getWriter();
        out.println("hello");
        try
        {
            out.println("hello1");
        Class.forName("oracle.jdbc.OracleDriver");
        out.println("loading driver");
        con=DriverManager.getConnection("jdbc:oracle:thin:@10.2.152.251:1533:VIS","edms45","edms45");
 
        st=con.createStatement();
 
        rs=st.executeQuery("select distinct VIEW_NAME from AJ_REPORT_COLUMNS_TMP");
 
        while(rs.next())
            {
                s=rs.getString(1);
                tnlist.add(rs.getString(1));
                out.println(s);
            }
 
 
        try
{
ObjectInputStream inputFromApplet = new ObjectInputStream(req.getInputStream());// <-
System.out.println("Obtained Input Stream");
Vector v=(Vector)inputFromApplet.readObject();
out.println("After readObject()");
inputFromApplet.close();
out.println("First String Obtained from applet is "+v.elementAt(0));
out.println("Second String Obtained from applet is "+v.elementAt(1));
ObjectOutputStream outputToApplet=new ObjectOutputStream(res.getOutputStream());
out.println("Obtained output Stream");
outputToApplet.writeObject(tnlist);
outputToApplet.flush();
outputToApplet.close();
out.println("Stream closed");// LAST LINE
}
catch(Exception e)
{
e.printStackTrace();
}
        }
        catch (SQLException e)
        {
            out.println(e);
        } catch (ClassNotFoundException ce) {
            // TODO Auto-generated catch block
            out.println(ce);
        }
 
 
    }
 
 
 
}

please let me know the solution for this..
thanks in advance