比如如下代码：
@Test
public void testSavePerson() {
try (Session session = sessionFactory.openSession()) {
Transaction tx = session.beginTransaction();
Person person = new Person();
Person person1 = new Person();
person.setName("222");
person1.setName("111");
session.save(person);
session.save(person1);
tx.commit();
}
}
始终报错，后来才发现是忘记主键自增了！！然后导致两个相同的对象在hibernate中，hibernate不能分辨这连个对象，就报错了！
添加
@GeneratedValue(strategy = GenerationType.AUTO)
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