Calling 3 different servlets from a single servlet

hi all,
i am in lot of soup...i am new to servlets,etc....so help me pls.
i need to call 3 different servlets from one servlet. all 3 servlets that i want to call perform different functions and execute queries on the database.
what i am trying to do is:
there is an html page that call a servlet called authenticate.java.(whose code is at the bottom of this page).
the servlet authenticate.java should authenticate a user according to the password and username supplied in the html page.
MAINLY:-
i need to display 3 buttons to the authenticted user. those 3 buttons each should call 3 different servlets, which do different things.
now in authenticte.java i set certain information in the session using session.putValue();
further, whatever servlet is called, i need to use that information i set into the session...using session.getValue().
PLS TELL ME HOW TO DO THAT...ALSO C IF THE BELOW CODE IS OK.
ALSO TELL ME HOW TO END A SESSION. ALSO DO SERVLETS SUPPORT SESSIONS?
I AM USING jdk1.3 and jsdk2.0.
* Authenticate.java
// this places all user variables in session
//to access use session.getAttribute
//dispatcher stuff
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import java.sql.*;
import java.io.*;
import java.util.*;
* @author Gudiya
* @version
public class Authenticate extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
HttpSession session = request.getSession(true);
Connection con=null;
String sessionid;
String deptcode;
String desig;
String add1;
String add2;
String contname;
PrintWriter out = response.getWriter();
try
{System.out.println(1);
response.setContentType("text/html");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:SACFA","","");
System.out.println("connection established");
catch(ClassNotFoundException e){
System.out.println("database driver not found");
System.out.println(e.toString());
catch(Exception e){System.out.println(e.toString());
String username=request.getParameter("username");
String password=request.getParameter("password");
try{
System.out.println(2);
PreparedStatement stmt=con.prepareStatement("SELECT * FROM AUTHENTICATION,mb_add where AUTHENTICATION.NAME=? AND AUTHENTICATION.PASSWORD=? AND mb_add.DEPT_NAME=?");
stmt.setString(1,username);
stmt.setString(2,password);
stmt.setString(3,username);
ResultSet rs=stmt.executeQuery();
System.out.println(3);
boolean rowfound=false;
rowfound=rs.next();
if (rowfound==true)
sessionid=session.getId();
System.out.println(sessionid);
System.out.println(4);
session.putValue("user",username);
rs.beforeFirst();
while (rs.next())
System.out.println(5);
deptcode=rs.getString("DEPT_CODE");
desig=rs.getString("DESIGNATION");
add1=rs.getString("ADDRESS1");
add2=rs.getString("ADDRESS2");
contname=rs.getString("NAME");
session.putValue("dept_code",deptcode);
session.putValue("designation",desig);
session.putValue("address1",add1);
session.putValue("address2",add2);
session.putValue("cont_name",contname);
System.out.println(6);
}          out.println("<html>");
          out.println("<head>");
          out.println("<title>Successful Login Screen</title>");
          out.println("</head>");
          out.println("<body bgcolor='ORANGE'>");
out.println("WELCOME SACFA MEMBERS FROM "+ username);
//print decorative html statements here
          out.println(" SELECT ANY ONE ACTION:-");
//out.println("<form Action="+"\"servlet/noc\""+" method =post>");//call for your noc servlet
//print decorative html statements here
out.println("<INPUT TYPE=submit VALUE='GENERATE NOC' NAME='NOC'>");
out.println("</form>");
//print decorative html statements here
//out.println("<form Action="+"\"servlet/comments\""+" method =post>");//call for your comment servlet
out.println("<INPUT TYPE=submit VALUE='ENTER/ MODIFY COMMENTS' NAME='COMMENTS' >");
out.println("</form>");
//print decorative html statements here
// out.println("<form Action="+"\"servlet/bye\""+" method = post>");
out.println("<INPUT TYPE=submit VALUE=EXIT NAME=EXIT >"); //place javascript fucction for exiting window
out.println("</form>");
          out.println("</body>");
          out.println("</html>");
con.close();
} catch( SQLException e){ }
out.close();}
THANK YOU,
REGARDS,
ASHNA

Hi Ashna,
You have use three different forms for three buttons. But I think all are commented one.It will also work if you uncomment it.
Else you can use only one Form without giving action in form tag. Use normal buttons instead of submit type buttons & call different JavaScript functions on onClick event for each button.
Try this out.
Ajay

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johnpoole said:
�It's hard to guess what would cause the exception without seeing code, but the interaction between the processes would differ from that between two applications, because the servlet process is started with a different class loader. I'm not sure which one the jvm started by the call would use.�
How can I enforce that a System classloader be used in the call to Runtime.getRuntime ().exec () ? (I mean by System classloader a classloader equals to the one applications are launched from console).
johnpoole said
�Is there a reason why you aren't starting the second process manually and then connecting to it on a port?�
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