org.hibernate.service.UnknownServiceException异常解决办法

深碍√TFBOYSˉ_ 2024-02-19 20:27 26阅读 0赞

## org.hibernate.service.UnknownServiceException异常 ##

查了很久的原因,发现是调用的两个方法,都要开启 sessionFactory!

#### 解决办法是将前面一个调用的方法中的 sessionFactory 最后置为空,sessionFactory = null;或者将session给close()掉! ####

在下一个方法中就能重新调用了,成功解决.

--------------------

如果不关闭 SessionFactory 可能会使系统变卡,原因可能是在每个方法中都重新 new 了一个SessionFactory对象.所以,我们可以考虑将 SessionFactory 重用.

public class MyHibernateSessionFactory {
    
        private final static Configuration configuration = new Configuration().configure();
        private final static ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        private final static SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    
        private MyHibernateSessionFactory() {
        }
    
        public static Session getSession() {
            return sessionFactory.openSession();
        }
    
        private static class SingletonHolder {
            private final static MyHibernateSessionFactory INSTANCE = new           MyHibernateSessionFactory();
        }
    
        public static MyHibernateSessionFactory getInstance() {
            return SingletonHolder.INSTANCE;
        }
    }

#### 在外部重新定义,然后在方法中调用: ####

public Users SearchUser() {
        Session session = MyHibernateSessionFactory.getSession();
        Transaction tx = session.beginTransaction();
           
        try{
            //do something
        }catch(Exception ex){
           //do something; 
        }finally{
            tx = null;   
            session.close();
        }
     }

这样就解决了.