Problem in building hibernate SessionFactory

[Yewint Ko]

Hi all , I have some problems with hibernate configuration..... somebody help me please...
this is my dir structure

Tomcat_Home
  |
  |_webapps
	|_ MyApp
	        |
	        |__ WEB-INF         	
	              |__ classes
	         	  |	    |__TestHibernateServlet.class	
		          |	    |__beans
		          |	          |__Employee.class
		          |
		          |__ hibernate.cfg.xml
		          |__ Employee.hbm.xml

I build the SessionFactory in the servlet (TestHibernateServlet.class) as follow

          PrintWriter out = response.getWriter();
          SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
          Session session = sessionFactory.openSession();
          Query query = session.createQuery("from Employee");
          List<Employee> finalList = query.list(); 
          out.println(finalList.get(1).getName());

I put the Hibenate jar file in lib correctly but I got this exception

java.lang.NoClassDefFoundError: org/dom4j/DocumentException (TestHibernateServlet.java:35)

Please help me out .I am new to hibernate, I don't know what to do .

[Vasily Kukhta]

Hello! Does your application contain dom4j jar file? If not, you should add it.
Usually, NoClassDefFoundError occures if some required jar is not present in the application.

[Yewint Ko]

Oh yes,I see. I added some libs and solved above problem. Now I have following libraries in my lib for hibernate

hibernate3.jar
antlr-2.7.6.jar
commons-collations-3.1.jar
dom4j-1.6.1.jar
javassist-3.9.0.GA.jar
jta-1.1.jar
slf4j-api1.5.8.jar

But when I run the app ,I see another error

java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
	org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:223)
	org.slf4j.LoggerFactory.bind(LoggerFactory.java:120)
	org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
	org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:269)
	org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:242)
	org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:255)
	org.hibernate.cfg.Configuration.<clinit>(Configuration.java:152)
	Servlets.TestHibernateServlet.processRequest(TestHibernateServlet.java:37)
	Servlets.TestHibernateServlet.doGet(TestHibernateServlet.java:59)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)

and then I run again I got another error

java.lang.NoClassDefFoundError: Could not initialize class org.hibernate.cfg.Configuration

Every first times after starting the server is first error and every second times is the last error. Why are the two errors different?
What will I do now? Do I need more libraries?

[xsunil kumar]

hibernate.cfg.xml and other hbm file you have kept in WEB-INF directory. You should need to place inside /WEB-INF/classes.

Try this one.

[Yewint Ko]

Yes I did. But I can't solve.
Actually, I think the problem is not with hibernate.cfg.xml file and .hbm.xml files. It might be because of lib files.
As for the first error, it said " java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder ".
When I take a look inside slf4j.jar, I don't see any such package "org/slf4j/impl/....". Something wrong?
This is how I write in my servlet

    
        Configuration con = new Configuration() ;
        SessionFactory sessionFactory = con.configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        Query query = session.createQuery("from Category");