hi all,
I run the code and get
java.lang.NullPointerException
roseindia.web.SearchTutorialAction.execute(SearchTutorialAction.java:41)
can any one tell me how to open session

[code]
package roseindia.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletContext;

import java.util.List;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import roseindia.net.plugin.HibernatePlugIn;

import roseindia.net.dao.hibernate.Tutorial;

import org.hibernate.SessionFactory;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Restrictions;
import org.hibernate.Criteria;



public class SearchTutorialAction extends Action
{
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception{
SearchTutorialActionForm formObj = (SearchTutorialActionForm)form;


ServletContext context = request.getSession().getServletContext();
/*Retrieve Session Factory */
SessionFactory _factory = (SessionFactory)
context.getAttribute(HibernatePlugIn.SESSION_FACTORY_KEY);
/*Open Hibernate Session */
Session session = _factory.openSession();
//Criteria Query Example
Criteria crit = session.createCriteria(Tutorial.class);
crit.add(Restrictions.like("shortdesc","% + formObj.getKeyword() +%")); //Like condition

//Fetch the result from database
List tutorials= crit.list();
request.setAttribute("searchresult",tutorials);

/*Close session */
session.close();
System.out.println("Hibernate Session Closed");
return mapping.findForward("success");
}
}[/code]