[hibernate-dev] How to custom ClassLoaderService in hibernate 4?

[☜鸵☞]

Such as the title, is there anyone can tell how to custom ClassLoaderService in hibernate 4? I've try to define a ClassLoader, the methods overrided contains findClass, loadClass, findResource, and findResources. 
 I set the ClassLoader as the ClassLoader of Hibernate, Environment, Application, and Resource in OSGi. There's not clearly right. The codes was following:
 /***********************Code Begin************************/
 BootstrapServiceRegistry bootstrapServiceRegistry = new BootstrapServiceRegistryBuilder()
    .withHibernateClassLoader(classLoader)
    .withEnvironmentClassLoader(classLoader)
    .withApplicationClassLoader(classLoader)
    .withResourceClassLoader(classLoader).build();
  Properties properties = configuration.getProperties();
  Environment.verifyProperties(properties);
  ConfigurationHelper.resolvePlaceHolders(properties);
  final ServiceRegistry serviceRegistry = new ServiceRegistryBuilder(
    bootstrapServiceRegistry).applySettings(properties)
    .buildServiceRegistry();
  configuration.setSessionFactoryObserver(new SessionFactoryObserver() {
    private static final long serialVersionUID = 1L;
    @Override
   public void sessionFactoryCreated(SessionFactory arg0) {
    // TODO Auto-generated method stub
    }
    @Override
   public void sessionFactoryClosed(SessionFactory arg0) {
    ((StandardServiceRegistryImpl) serviceRegistry).destroy();
   }
  });
 configuration.buildSessionFactory(serviceRegistry);
  /***********************Code End************************/
 The classLoader in the codes which is defined by myself.
 It's fail to achieve the effect of mine, so I winna custom the ClassLoaderService.