hibernate4中buildSessionFactory 过时

从这里看的
http://hi.baidu.com/aurorapolaris/item/dfb8452b21401e85af48f5d9

hibernate3中是这样写的：
private static final SessionFactory sessionFactory = newConfiguration().configure().buildSessionFactory();
hibernate4中可以这样写：
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;

private static SessionFactory configureSessionFactory()throws HibernateException{
    Configuration configuration =new Configuration();
    configuration.configure();
    serviceRegistry =new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();       
    sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    return sessionFactory;
}