IllegalStateException：存储实体< entity>时发生错误实体拷贝<实体>已被分配给不同的实体< entity_copy> [英] IllegalStateException: Error occurred while storing entity <entity> An entity copy <entity> was already assigned to a different entity <entity_copy>

问题描述

经过大量的谷歌搜索，我没有找到我的问题的答案，除了降级休眠版本。但我在2003年的类似职位上遇到过这种情况。

问题：

  //在第一个会话中，我做
 session1.save（entity）; 
 session1.getTransaction（）。commit（）; 
 session1.close（）; 
 
 //在第二个会话中（客户端响应之后），我找回了实体的序列化副本
 entityCopy = deserialize（jsonString）; 
 entityCopy.setEntityDetail（newDetail）; // 1 
 session2.merge（entityCopy）; //例外！ 
  

如果注释字符串1，一切正常！

异常：：
$ b IllegalStateException ：实体＃4700实体副本＃4700已被分配给不同的实体@ 2e7b134a

问题：

1. 我的感觉出了什么问题？


2. 据我所知，merge（）被实现了这些情况下，当我们可以有实体拷贝缓存。




1. 如果重要实体 - > EntityDetail 与 lazy，orphanRemoval = true链接，则一对一 关系


2. 我重写了equals（）和hashCode（）方法。






解决方案

我以下面的方式解决了这个问题：反序列化的实体，然后再对其进行一些更改。 （唯一的变化是2字符串）：



  //在第一个会话中，我做
 session1.save （实体）; 
 session1.getTransaction（）。commit（）; 
 session1.close（）; 
 
 //在第二个会话中（客户端响应之后），我找回了实体的序列化副本
 entityCopy = deserialize（jsonString）; 
 entityCopy =（Entity）session.merge（entityCopy）; // 2 
 entityCopy.setEntityDetail（newDetail）; 
 session2.merge（entityCopy）; // all works fine 
  




After a lot of googling I didn't find answer to my question, except downgrade hibernate version. But I faced this situation at similar post dated as 2003 year.

What the problem:

//in the  first session I do
session1.save(entity);
session1.getTransaction().commit();
session1.close();

//in the second session (after client response), I get back the serialized copy of the entity
entityCopy = deserialize(jsonString);
entityCopy.setEntityDetail(newDetail); //1
session2.merge(entityCopy); //EXCEPTION!

If comment string 1, all works fine!

Exception:

IllegalStateException: Error occurred while storing entity #4700 An entity copy #4700 was already assigned to a different entity @2e7b134a

Questions:

1. What is wrong in my sitation?
2. As I understand, merge() operation was implemented for those cases, when we alreadty have the entity copy in cache. Am I wrong?

PS

1. If it is important Entity -> EntityDetail are linked with lazy, orphanRemoval = true, one-2-one relationship
2. I overrided equals() and hashCode() methods.

解决方案

I solve this problem in the next way: it is necessary to merge deserialized entity before you proceed some changes to it. (the only change is in the 2 string):

//in the  first session I do
session1.save(entity);
session1.getTransaction().commit();
session1.close();

//in the second session (after client response), I get back the serialized copy of the entity
entityCopy = deserialize(jsonString);
entityCopy = (Entity) session.merge(entityCopy); //2
entityCopy.setEntityDetail(newDetail); 
session2.merge(entityCopy); //all works fine

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