Need help on upgrading Tomcat from 3.1 to 4.1.x

[Eric Leung]

Dear All Tomcat Users,

I'm working on upgrading Tomcat from a very old version to 4.1.x
Currently, we have a servlet being run at the start of the web (specified in
web.xml ).
But this servlet may have some objects obsoleted in ver 4.1.x.

Does anyone know how should I change this servlet in order to make it runs
on Tomcat 4.1.x?

THANKS IN ADVANCE!!!!!!

Here is the code:

package com.xxx.common;
.
import ....
import ....
import ....
....
...
..
.

import java.util.Hashtable;
import java.util.Properties;
import java.io.File;
import java.io.IOException;

import javax.mail.Session;
import javax.servlet.GenericServlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;

import org.apache.tomcat.core.Context;
import org.apache.tomcat.core.ServletContextFacade;


/**
 * InitServlet is a "faceless" servlet that is automatically started when
 * the servlet container starts. InitServlet requires only one initial
parameter
 * at startup: config.  This parameter refers to the property that will
contain
 * all the tunables for the site.
 *
 * ...
 * ...
 */
 
public class InitServlet extends GenericServlet {

private static Hashtable obj_table;
private static String CONFIG_NAME = "xxx.properties";


public InitServlet() {
        super();
}


/**
 * Initialization routine to startup services for xxx
 *
 * @param conf configuration for this servlet
 * @exception ServletException not used in this method
 */
public void init(ServletConfig conf) throws ServletException {
        super.init(conf);
        
        obj_table = new Hashtable();

        // Get the context of this servlet
        Context context = ((ServletContextFacade) conf.getServletContext()).
getRealContext();
        
        obj_table.put(context.getClass().getName(), context);
        
        String conf_filename = context.getContextManager().getTomcatHome() +

                File.separator + "conf" + File.separator + CONFIG_NAME;
                
        if (! new File(conf_filename).exists()) {
                // Configuration file doesn't exist; tell user
                log("Configuration file: " + conf_filename + " does not
exist");
                log("Please make sure file exist for the iSteelAsia.com
application");
                System.err.println("Configuration file: " + conf_filename +
" does not exist");
                System.err.println("Please make sure file exist for the
iSteelAsia.com application");
                return;
        }
....
....
...
..
.
}

/**
 * Retrieves an object out of the object hash table.
 *
 * @param name the given name of the object
 * @return the actual object
 */
public static Object getObject(String name) {
        if (obj_table == null) {
                return null;
        }
        
        return obj_table.get(name);
}


/**
 * Inserts an object into the object hash table.
 *
 * @param name the name of the object
 * @param key the object itself
 */
public static void setObject(String name, Object key) {
        if (obj_table == null) {
                return;
        }
        
        obj_table.put(name, key);
}

/**
 * The service method is blank, meaning that this servlet will do nothing
other then
 * a faceless init. This servlet will return no data.
 *
 * @param request javax.servlet.ServletRequest servlet request object
 * @param response javax.servlet.ServletResponse sevlet response object
 */
public void service(ServletRequest request, ServletResponse response) 
        throws ServletException, IOException { }

} /* InitServlet */