org.hibernate.PersistentObjectException: detached entity passed to persist:

最新推荐文章于 2019-02-26 10:48:42 发布

原创最新推荐文章于 2019-02-26 10:48:42 发布 · 2.9k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#user #exception #jpa #thread #string #date

异常总结专栏收录该内容

4 篇文章

订阅专栏

本文探讨了在使用Java Persistence API (JPA)进行实体持久化操作时遇到的PersistentObjectException异常。主要原因是实体类中未正确配置主键生成策略，导致尝试插入已设置ID的记录时引发错误。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package com.itcast.jpa;

import java.util.Date;

import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

import com.itcast.jpa.domain.User;

public class BaseTest {

/**
* @param args
*/
public static void main(String[] args) {
  User user = new User();
  user.setId(1);
  user.setName("zhangsan");
  user.setBirthday(new Date());
  addUser(user);
}
static void addUser(User user) {
  EntityManager emf = null;
  EntityTransaction tr = null;
  try {
   emf = JpaUtil.getEntityManager();
   tr= emf.getTransaction();
   tr.begin();
   emf.persist(user);
   tr.commit();
  }finally {
   if(emf !=null) {
    emf.close();
   }
  }
}
}

Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.itcast.jpa.domain.User
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:219)
at com.itcast.jpa.BaseTest.addUser(BaseTest.java:29)
at com.itcast.jpa.BaseTest.main(BaseTest.java:20)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: com.itcast.jpa.domain.User
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:213)
解决如下：因为在实体类中并没有设置主键增长方式而JPA默认的又是自动增长

所以插入的时候设置ID的话就会出现这个错误

在网上还有人说 @Id写错也会导致类似错误