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Hibernate version:
hibernate3.jar
Mapping documents:
dynamic web project
Code between sessionFactory.openSession() and session.close():
protected void doPost(HttpServletRequest request, HttpServletResponse response)
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;



public class HibernateUtil implements java.io.Serializable {

public static final SessionFactory sessionFactory;

static {
try {

// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();

} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}

}


public static final ThreadLocal session = new ThreadLocal();

public static Session currentSession() throws HibernateException {
Session s = (Session) session.get();
// Open a new Session, if this thread has none yet
if (s == null) {
s = sessionFactory.openSession();
// Store it in the ThreadLocal variable
session.set(s);

}
return s;
}

public static void closeSession() throws HibernateException {
Session s = (Session) session.get();
if (s != null)
s.close();
session.set(null);

}
Full stack trace of any exception that occurs:
11.11.2008 14:53:59 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Portable Runtime which allows optimal performance in production environments was not found on the java.library.path: D:\Program Files\Java\jdk1.6.0_10\bin;.;D:\WINDOWS\Sun\Java\bin;D:\WINDOWS\system32;D:\WINDOWS;D:/Program Files/Java/jre6/bin/client;D:/Program Files/Java/jre6/bin;D:\WINDOWS\system32;D:\WINDOWS;D:\WINDOWS\System32\Wbem;D:\Program Files\Java\jre1.6.0_07;D:\Program Files\Java\jdk1.6.0_10;C:\AppServ\Apache2.2\bin;C:\AppServ\php5;C:\AppServ\MySQL\bin;D:\Program Files\Java\jdk1.6.0_10\bin;D:\Program Files\Java\jdk1.6.0_10\jre\bin
11.11.2008 14:53:59 org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-80
11.11.2008 14:53:59 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 625 ms
11.11.2008 14:53:59 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
11.11.2008 14:53:59 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.12
11.11.2008 14:53:59 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/dom4j/DocumentException
11.11.2008 14:54:00 org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet Init as unavailable
11.11.2008 14:54:00 org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /Portability_web threw load() exception
java.lang.ExceptionInInitializerError
at util.HibernateUtil.<clinit>(HibernateUtil.java:29)
at servlet.Init.<init>(Init.java:43)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1048)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:925)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3880)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4141)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:680)
at org.apache.catalina.startup.Catalina.start(Catalina.java:536)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: java.lang.NoClassDefFoundError: org/dom4j/DocumentException
at util.HibernateUtil.<clinit>(HibernateUtil.java:24)
... 24 more
Caused by: java.lang.ClassNotFoundException: org.dom4j.DocumentException
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 25 more
11.11.2008 14:54:00 org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-80
11.11.2008 14:54:00 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
11.11.2008 14:54:00 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/32 config=null
11.11.2008 14:54:00 org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
11.11.2008 14:54:00 org.apache.catalina.startup.Catalina start
INFO: Server startup in 844 ms
Name and version of the database you are using:
mysql 5.0
The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:


i' m read all google stuff about my problem, but i dons't resolved my problem yet.
Please help.

have a nice day.

I guess U r missing a library in the deployed package.
If using eclipse set it as JEE dependency

JAVA BUILD PATH ->JEE dependency.

Verify that the dom4j lib is in the WEB-INF\lib\
I hope this helps.... if so just dont forget to rate :)