原因分析:
1. hibernate.cfg.xml配置文件有没有映射实体类
<mapping resource="/***/***/***.hbm.xml"/>
2、hibernate 5 创建 Session时,需加上cfg.addClass(**.class);
package com.example;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
/**
* @Classname HibernateTest
* @Description TODO
* @Date 2019-8-6 15:57
* @Created by Administrator
*/
public class HibernateTest {
public static void main(String[] args) {
// 1、读取hibernate。cfg.xml配置文件
Configuration cfg = new Configuration().configure();
cfg.addClass(Books.class);
// 2、创建服务注册
ServiceRegistry registry = new StandardServiceRegistryBuilder()
.applySettings(cfg.getProperties())
.build();
// 3、新建SessionFactory对象
SessionFactory factory = cfg.buildSessionFactory(registry);
// 4、创建session对象
Session session = factory.openSession();
// 5、获取数据
Books books = (Books) session.get(Books.class,"8");
System.out.println(books);
// 6、释放资源
session.close();
factory.close();
}
}
修改完成后可正常运行: