I tried to create a very small web app in NetBeans using Hibernate. I placed hibernate3.jar , log4J-1.2.14.jar, sl4j.api.jar, sl4j-log4ja2-1.5.6.jar, dom4j-1.6.1.jar, jta.jar, and ehcache.jar under the Libraries folder. I also placed hibernate.cfg.xml under the default package of the source folder and default log4j.properties file and Book.hbm.xml under another package of the Source folder. I don't know whether it is right or wrong. I wrote Hibernate Manager class for sessionfactory and controller servlet as follows. But if I run this servlet I get an exception.
Controller servlet:
import java.io.*;
import java.net.*;
import Syron.HibernateManager;
import Syron.BookInfo;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.List;
public class ControllerServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HibernateManager manager = new HibernateManager(BookInfo.class);
List categories = manager.findAll();
request.setAttribute("categories", categories);
ServletContext context = getServletContext();
try
{
RequestDispatcher dispatcher = context.getRequestDispatcher("/welcomeJSF.jsp");
dispatcher.forward(request, response);
}
catch(Exception es) {
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
public String getServletInfo() {
return "Short description";
}
}
Manager:
import java.util.*;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.util.*;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
//import org.slf4j.impl.*;
public class HibernateManager {
private Class _cl;
public HibernateManager(Class cl)
{
_cl = cl;
}
public List findAll() throws HibernateException
{
List rv = new ArrayList();
SessionFactory sessionFactory;
try
{
Configuration config = new Configuration();
config = config.configure("/hibernate.cfg.xml");
sessionFactory = config.buildSessionFactory();
}
catch (HibernateException ex)
{
throw new RuntimeException("Exception building SessionFactory: " +ex.getMessage(), ex);
}
rv = sessionFactory.getCurrentSession().createCriteria(BookInfo.class).list();
return rv;
}
public BookInfo findById(int id) throws HibernateException
{
Session session = SessionProvider.currentSession();
BookInfo rv = (BookInfo) session.get(_cl, new Integer(id));
return rv;
}
}
Exception:
java.lang.IllegalAccessError: tried to access field org.slf4j.impl.StaticLoggerBinder.SINGLETON from class org.slf4j.LoggerFactory
org.slf4j.LoggerFactory.<clinit>(LoggerFactory.java:60)
org.hibernate.cfg.Configuration.<clinit>(Configuration.java:152)
Syron.HibernateManager.findAll(HibernateManager.java:34)
ControllerServlet.processRequest(ControllerServlet.java:40)
ControllerServlet.doGet(ControllerServlet.java:62)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
I tried various things but couldn't fix this. Where did I go wrong? I also placed the commons-logging.jar file instead of sl4j.jar but then I get No class definition found exceptions for org.sl4j.impl.?. So I searched and replaced sl4j-log4ja2-1.5.6.jar and tried again as above. How can I use Hibernate in NetBeans?
