servlet cant see getServletContext() from inheritance

[EM. Lashkar]

Hi there ,
While implementing MVC architecture ,
I made an abstract ParentController.java which is extended by ApplicationController.java. In the ApplicationController I am doing :
// get the application object
ServletContext app = getServletContext();

// select login.jsp as the template
RequestDispatcher disp;
disp = app.getRequestDispatcher("index.jsp");
and at compile time I am getting:
ApplicationController.java:46: cannot resolve symbol
symbol : method getServletContext ()
Any idea? Thanks in advance for your comments .
Here are the code of the 2 classes :
----------------------------------------------

package com.cisapps.gnotelecomservy.servlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
//import com.cisapps.gnotelecomservy.utils.TelecomServyConstants;
//import org.apache.log4j.Logger;
//import org.apache.log4j.xml.DOMConfigurator;
/**
 * This is the base servlet and all servlets of this application should extend this.
 * This is an abstract class containing one abstract method doProcess(). 
 * All the child classes should implement this method. 
 * Creation date: (12/09/2002 10:55:01 AM)
 * @author: 
 * @version: 1.0
 */
public abstract class ParentController extends javax.servlet.http.HttpServlet {

/**
 * constructor comment.
 */
public ParentController() {
super();
} 
/**
 * This method forwards the request to the inherited servlets. If the session is expired or null then it 
 * redirects to the homepage/login page. If any exception occurs in any servlet, 
 * it will catch that exception and redirect it to error page.
 * Creation date: (12/09/2002 10:55:01 AM)
 * @param req javax.servlet.http.HttpServletRequest
 * @param res javax.servlet.http.HttpServletResponse
 * @exception javax.servlet.ServletException 
 * @exception java.io.IOException If any I/O error occurs
 */
public void doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) throws javax.servlet.ServletException, java.io.IOException 
{
HttpSession session = null;

try
{
session = req.getSession(false);
if(session == null)
{
 
PrintWriter out=res.getWriter();
res.setContentType("text/html");
out.println("html");
/*out.println("body on--load=\"window.location.href='"+req.getContextPath()+"\jsp\index.jsp"+"'\""); */
out.println("body");
 out.println("html");
 }

else
{
session = req.getSession(true);
session.setMaxInactiveInterval(1800);
doProcess(req, res);
}


}
catch(Exception e)
{

// forwarding to error page 
String errMsg = e.getMessage();
System.out.println("Error occured : "+e.toString());
req.setAttribute("errMessage",errMsg);
RequestDispatcher rd = getServletContext().getRequestDispatcher("jsp/error_page.jsp");
rd.forward(req,res);
}
}
/**
 * Handle the POST method. To handle POST, we will simple pass the request to the GET method
 * Creation date: (12/09/2002 10:55:01 AM)
 * @param req javax.servlet.http.HttpServletRequest
 * @param res javax.servlet.http.HttpServletResponse
 * @exception javax.servlet.ServletException 
 * @exception java.io.IOException 
 */
public void doPost(HttpServletRequest req, HttpServletResponse res) throws javax.servlet.ServletException, java.io.IOException 
{
doGet(req,res);
}
/**
 * This method receive the DataSource instance from the servletcontext (application).
 * If that instance is null then it create a new one and save it in application scope.
 * Creation date: (12/09/2002 10:55:01 AM)
 */
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}

/**
 * This is the abstract method which is implemented by every child class.
 * Creation date: (06/06/2002 11:04:17 AM)
 * @exception javax.servlet.Exception 
 
 */
public abstract void doProcess(HttpServletRequest req, HttpServletResponse res) throws Exception;
}

----------------------------------------------
----------------------------------------------

package com.cisapps.gnotelecomservy.servlets;
import java.io.*; 
import javax.servlet.*;
import javax.servlet.http.*;

public class ApplicationController extends com.cisapps.gnotelecomservy.servlets.ParentController {

/**
 * ApplicationController constructor comment.
 */
public ApplicationController() {
super();
}

/**
 * This method forwards the request to the inherited servlets. If the session is expired or null then it 
 * redirects to the homepage/login page. If any exception occurs in any servlet, 
 * it will catch that exception and redirect it to error page.
 * Creation date: (12/09/2002 10:55:01 AM)
 * @param req javax.servlet.http.HttpServletRequest
 * @param res javax.servlet.http.HttpServletResponse
 * @exception javax.servlet.ServletException 
 */
public void doProcess(HttpServletRequest request, HttpServletResponse response)throws Exception
{

HttpSession session = request.getSession(false);
response.setContentType("text/html");

// Save the message in the request for login.jsp
request.setAttribute("message", "test");

// get the application object
ServletContext app = getServletContext();

// select login.jsp as the template
RequestDispatcher disp;
disp = app.getRequestDispatcher("index.jsp");

// forward the request to the template
disp.forward(request, response);
}

}

[ December 15, 2003: Message edited by: Mike Curwen ]

[Mike Curwen]

I think all your subclasses will need to define

public void init(ServletConfig config) throws ServletException {
super.init(config);
}

?