Hibernate 5.X 版本中Exception in thread "main" org.hibernate.MappingException: Unknown entity: cn.xxx.p

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最近开始使用最新版本的Hibernate5，所有的配置感觉都正确却还是没有结果。

使用如下：

public static void main(String[] args) throws Exception {Configuration cfg = new Configuration().configure();ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();SessionFactory sf = cfg.buildSessionFactory(serviceRegistry);Session session = sf.openSession();Transaction transaction = session.beginTransaction();User user = new User();user.setName("xxx");user.setPassword("pswdddd");session.save(user);transaction.commit();session.close();sf.close();}

运行结果老是报错：

Exception in thread "main" org.hibernate.MappingException: Unknown entity: cn.xxx.pojo.Userat org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1533)at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:682)at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)at cn.xxx.test.Test.main(Test.java:24)

后来看下官方文档， Hibernate 5 启用配置的方式跟原来的不一样了，正确应该如下：

直接从官方文档是copy过来的

public static void setUp() throws Exception {// A SessionFactory is set up once for an application! StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure() // configures settings from hibernate.cfg.xml.build();try {SessionFactory sf = new MetadataSources( registry ).buildMetadata().buildSessionFactory();Session session = sf.openSession();Transaction transaction = session.beginTransaction();User user = new User();user.setName("笑笑熊");user.setPassword("0719");session.save(user);transaction.commit();session.close();sf.close();}catch (Exception e) {StandardServiceRegistryBuilder.destroy( registry );e.printStackTrace();}}

最后终于运行成功了：

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