When I try to compile my login servlet I get the error below:

Note: LoginServlet.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.

My Login servlet is as shown below:


import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;


public class LoginServlet extends HttpServlet{
  
	public void doPost(HttpServletRequest req,HttpServletResponse res)
	                              throws ServletException,IOException {
		
	res.setContentType("text/html");
	PrintWriter out =res.getWriter();


        Connection conn = null;
	ServletConfig config;
	Statement stmt=null;
     	ResultSet rs = null;
	boolean status = false;
        String wrongUser = "Invalid UserName ";
        String wrongPwd = "Invalid Password ";
	
	String userName = req.getParameter("userName");
	String password = req.getParameter("password");

        out.println("user"+userName);
        out.println("pass"+password);
                 

          
        HttpSession session = req.getSession(true);
  
        userName = userName.trim();
        password = password.trim();	        
		
        try{
           Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
           conn=DriverManager.getConnection("jdbc:odbc:mpemsdb1");
        }
       	catch(Exception  e){
            out.println("Could not open connection to DB"
+e.toString());
            e.printStackTrace();
        }
         

        try {
            stmt = conn.createStatement();
            rs= stmt.executeQuery("SELECT admin_password FROM
administrator WHERE admin_userName ='"+userName+"' ");

	   /*    
            if(rs == null)
                 res.sendRedirect("http://simt-dev.unl.ac.uk:8241/adminpage.html");
      	
            rs.next();
            if(!password.equals(rs.getString(4)))
                 res.sendRedirect("http://simt-dev.unl.ac.uk:8241/adminpage.html");
	   */


            if(rs == null){// no user with this username
                session.putValue("mpems.errormsg",wrongUser);
                res.sendRedirect("http://simt-dev.unl.ac.uk:8241/loginErrorPage.jsp");
            }
      	
            rs.next();
            if(!password.equals(rs.getString(4))){
                 session.putValue("mpems.errormsg",wrongPwd);
                 res.sendRedirect("http://simt.unl.ac.uk:8241/loginErrorPage.jsp");

            }		    
            //put values in session...
  	    
            session.putValue("mpems.user",userName);
	    session.putValue("mpems.pass",password);
 
           // if(password.equals(rs.getString(4)))
           //         session.putValue("mpems.userToEdit",userName);
  	   // status = true;
 
         

            if(password.equals(rs.getString(4)))
                 res.sendRedirect("http://simt-dev.unl.ac.uk:8241/index.jsp");
           // else
             //   res.sendRedirect("http://simt-dev.unl.ac.uk:8241/adminpage.html");

            }
            
            catch(Exception  e) { 
                session.putValue("mpems.errormsg",wrongUser);
                res.sendRedirect("http://simt-dev.unl.ac.uk:8241/loginErrorPage.jsp");
    
            }

    }//do post ends here

}



Please kindly help me out - I'd like my servlet to work.