OSUser and Hibernate: java.lang.NoClassDefFoundError: net/sf/hibernate/HibernateException

Ok, I've setup a test to use osuser in combination with Hibernate. But I
 get the following error when requestion the servlet:
 
 I've got hibernate2.jar and osuser.jar in my WEB-INF/lib file
 
 java.lang.RuntimeException: net/sf/hibernate/HibernateException
         com.opensymphony.user.util.ConfigLoader.load(ConfigLoader.java:74)
         com.opensymphony.user.UserManager.(UserManager.java:103)
         com.opensymphony.user.UserManager.(UserManager.java:58)
         org.mathesis.test.OSUserTest.doGet(OSUserTest.java:35)
         javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
         javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 
 In the catalina.out logfile I could find the following error:
 
 com.opensymphony.user.util.ConfigLoader load 
  SEVERE: Exception 
  java.lang.NoClassDefFoundError: net/sf/hibernate/HibernateException 
     at
  com.opensymphony.user.provider.hibernate.HibernateBaseProvider.init(HibernateBaseProvider.java:80) 
     at
  com.opensymphony.user.util.ConfigLoader.addProvider(ConfigLoader.java:123) 
     at
  com.opensymphony.user.util.ConfigLoader.access$100(ConfigLoader.java:37) 
     at
  com.opensymphony.user.util.ConfigLoader$ConfigHandler.endElement(ConfigLoader.java:154) 
     at  
  ... 
 
 My osuser.xml file:
 
 <opensymphony-user> 
   <provider
   class="com.opensymphony.user.provider.hibernate.HibernateCredentialsProvider"
   /> 
   <provider
   class="com.opensymphony.user.provider.hibernate.HibernateProfileProvider"
   /> 
   <provider
   class="com.opensymphony.user.provider.hibernate.HibernateAccessProvider"
   /> 
  </opensymphony-user>
 
 My TestServlet:
 
 /*
  * Created on 29-sep-2003
  *
  * To change the template for this generated file go to
  * Window - Preferences - Java - Code Generation - Code and Comments
  */
 package org.mathesis.test;
 
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.Collection;
 import java.util.Iterator;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import com.opensymphony.user.DuplicateEntityException;
 import com.opensymphony.user.ImmutableException;
 import com.opensymphony.user.User;
 import com.opensymphony.user.UserManager;
 import com.opensymphony.user.provider.CredentialsProvider;
 
 /**
  * @author iljahehenkamp
  *
  * To change the template for this generated type comment go to
  * Window - Preferences - Java - Code Generation - Code and Comments
  */
 public class OSUserTest extends HttpServlet
 {
         public void doGet(HttpServletRequest request,
 HttpServletResponse response) throws IOException, ServletException
         {
                 UserManager um = new UserManager();
                 PrintWriter out = response.getWriter();
                 
                 Collection credentialProviders = null;
                 
                 try
                 {
                         credentialProviders =
 um.getCredentialsProviders();
                         
                         for (Iterator iterator =
 credentialProviders.iterator(); iterator.hasNext();)
                         {
                                 CredentialsProvider provider =
 (CredentialsProvider) iterator.next();
                         }
                 }
                 catch (NullPointerException e)
                 {
                         // TODO Auto-generated catch block
                         e.printStackTrace(out);
                 }
                 
                 try
                 {
                         User u = um.createUser("imhehenkamp");
                 }
                 catch (DuplicateEntityException e)
                 {
                         // TODO Auto-generated catch block
                         e.printStackTrace(out);
                 }
                 catch (ImmutableException e)
                 {
                         // TODO Auto-generated catch block
                         e.printStackTrace(out);
                 }
                 catch (NullPointerException e)
                 {
                         // TODO Auto-generated catch block
                         e.printStackTrace(out);
                 }
                 catch (RuntimeException e)
                 {
                         // TODO Auto-generated catch block
                         e.printStackTrace(out);
                 }
                 catch (Exception e)
                 {       
                         e.printStackTrace(out);
                 }
         }
 }
 
 Anyone knows what's wrong? 


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