org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping clas

在Hibernate中使用annotation出现错误。如题目所示。

HibernateSessionFactory类中：

//    private  static Configuration configuration = new Configuration(); //xx.hbm.xml形式下的new    
     private  static Configuration configuration = new org.hibernate.cfg.AnnotationConfiguration(); //Annotation形式下的new