<listener>
   <listener-class>
  com.modelingagency.listeners.CustomServletContextListener
   </listener-class>
 </listener>

import java.io.Reader;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
  
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
  
public class CustomServletContextListener implements ServletContextListener
{
 public void contextInitialized(ServletContextEvent event)
 { 
  ServletContext ctx = event.getServletContext();
         
     String resource = "mybatis.config.xml";
     try{     
      Reader reader = Resources.getResourceAsReader(resource);    
      SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); 
      ctx.setAttribute("sqlSessionFactory", sqlSessionFactory); 
     }
     catch(Exception e){
      System.out.println("FATAL ERROR: myBatis could not be initialized");
      System.exit(1);
     }   
 }
  
 @Override
 public void contextDestroyed(ServletContextEvent event){
   //nothing to do here right now
 }
}

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.ibatis.exceptions.PersistenceException;
import org.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.modelingagency.db.ModelingAgencyDAO;
import com.modelingagency.objects.*;

public class TestServlet  extends HttpServlet{
	
	private static Logger log = LoggerFactory.getLogger(TestServlet.class);
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	{
		HttpSession session = request.getSession();			
		ServletContext sc = getServletContext();
		
		SqlSessionFactory sf = (SqlSessionFactory)getServletContext().getAttribute("sqlSessionFactory");
		ModelingAgencyDAO dao = new ModelingAgencyDAO(sf);
		
		try
		{
			ArrayList<Client> clients = dao.getClients();	
			log.info("Client size: " + clients.size());
			ArrayList<Model> models = dao.getModels();				
			ArrayList<Booking> bookings = dao.getBookings();				
			
			request.setAttribute("all_clients", clients);	
			request.setAttribute("all_models", models);
			request.setAttribute("all_bookings", bookings);
							
		}
		catch(PersistenceException p)
		{
			p.printStackTrace();		
		}
		finally
		{
			request.setAttribute("message","Welcome to the modeling agency MyBatis tutorial");
			log.info("The message attribute has been set");
		}	
																
		RequestDispatcher view = request.getRequestDispatcher("index.jsp");
		view.forward(request, response);
	}
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request,response);
	}
	
}