not redirecting to main page

i tried almost 100 times but i don't know why the page is not redirecting to main page after performing deletion in the following code

import java.io.*;   
import java.sql.*;   
import javax.servlet.*;   
import javax.servlet.http.*;   
import java.util.*;   
import java.lang.String;   
import java.sql.Connection;
import javax.servlet.RequestDispatcher;
   
import java.sql.Statement;   
import java.sql.ResultSet;   
import javax.naming.*;   
import javax.naming.directory.*;   
import oracle.jdbc.pool.OracleDataSource;

public class DeleteUser extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response)
                                   throws ServletException,IOException{
		doPost(request,response);
	}
 
   public void doPost(HttpServletRequest request, HttpServletResponse response)
                                   throws ServletException,IOException{
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			Connection con = null;   
    			Statement st1 = null;   
    		
    			ResultSet rs = null; 
			String str = request.getQueryString();

int P_ID = Integer.parseInt(str);  
     			
   		 try {   
       
     			 Context initContext = new InitialContext();                     
      			 Context envContext = (Context) initContext.lookup("java:/comp/env");                     
      			OracleDataSource ds = (OracleDataSource) envContext.lookup("jdbc/abc");                      
     			 if (envContext == null)throw new Exception("Error: No Context");                   
      			if (ds == null) throw new Exception("Error: No DataSource");                    
      			if (ds != null)                           
     			 con = ds.getConnection();   
      
      			st1 = con.createStatement();   
				
				ArrayList al=null;
				ArrayList userList =new ArrayList();
				String query = "delete from LTCINFO.PERSONS  where P_ID="+P_ID;
				            
			    int i = st1.executeUpdate(query);
				if(i>=0)
				{
					response.sendRedirect("ServletRecord");
				}
				 rs.close();   
                    st1.close(); 
				 con.close();   
  
        } catch (SQLException se) {   
            out.println("An Error Had occurred while accessing the database");   
            out.println("<HR>");   
  
            out.println(se.getMessage());   
        }   
           
        catch (Exception e) {   
            e.printStackTrace();   
            
        } finally {   
            try {   
                if (rs != null)   
                    rs.close();   
                if (st1 != null)   
                    st1.close();  
 
                if (con != null)   
                    con.close();   
            } catch (Exception e) {   
                out.println(e);   
            }   
        }

}
}

but it is redirecting in my following code of addition

import java.io.*;   
import java.sql.*;   
import javax.servlet.*;   
import javax.servlet.http.*;   
import java.util.*;   
import java.lang.String;   
import java.sql.Connection;
import javax.servlet.RequestDispatcher;
   
import java.sql.Statement;   
import java.sql.ResultSet;   
import javax.naming.*;   
import javax.naming.directory.*;   
import oracle.jdbc.pool.OracleDataSource;

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

String P_ID = request.getParameter("P_ID");

int id = Integer.parseInt(P_ID);
			
			String LASTNAME = request.getParameter("LASTNAME");
			String FIRSTNAME = request.getParameter("FIRSTNAME");
			String ADDRESS = request.getParameter("ADDRESS");
			String CITY = request.getParameter("CITY");
			
		Connection con = null;   
    			Statement st1 = null;   
    		
    			ResultSet rs = null;   
     			
   		 try {   
       
     			 Context initContext = new InitialContext();                     
      			 Context envContext = (Context) initContext.lookup("java:/comp/env");                     
      			OracleDataSource ds = (OracleDataSource) envContext.lookup("jdbc/abc");                      
     			 if (envContext == null)throw new Exception("Error: No Context");                   
      			if (ds == null) throw new Exception("Error: No DataSource");                    
      			if (ds != null)                           
     			 con = ds.getConnection();   
      
      			st1 = con.createStatement();   
			
		
			
				
				ArrayList al=null;
				ArrayList userList =new ArrayList();
				String query = "insert into LTCINFO.PERSONS(P_ID,LASTNAME,FIRSTNAME,ADDRESS,CITY) values ("+id+",'"+LASTNAME+"','"+FIRSTNAME+"','"+ADDRESS+"','"+CITY+"')";
				
            
			    int i = st1.executeUpdate(query);
				
				if(i>0)
				{
					response.sendRedirect("ServletRecord");
				}
				 rs.close();   
                    st1.close(); 
				 con.close();   
  
        } catch (SQLException se) {   
            out.println("An Error Had occurred while accessing the database");   
            out.println("<HR>");   
  
            out.println(se.getMessage());   
        }   
           
        catch (Exception e) {   
            e.printStackTrace();   
            
        } finally {   
            try {   
                if (rs != null)   
                    rs.close();   
                if (st1 != null)   
                    st1.close();  
 
                if (con != null)   
                    con.close();   
            } catch (Exception e) {   
                out.println(e);   
            }   
        }

}
}

i am not getting if everything is same then why it is not redirecting to the main page.

Please do not post, essentially the same question, multiple times.
Let us continue the discussion in your original topic here http://www.coderanch.com/t/571694/Servlets/java/exception-while-running-code