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identifier of an instance of Object is altered from 2 to 5

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Hibernate的提示错误
Caused by: org.hibernate.HibernateException:
identifier of an instance of ... is alterde from 1 to 5

是下面这段代码报的错
public void insertRelation(Object obj,List list1)
	{
		Object obj= new Object ();

		for (int i = 0; i < list1.size(); i++) 
		{
		   service.insert(obj);
		}
		
	}



这个错误是由于在一个事务中更新了主键,而主键是不能被更新的.
这段代码的错误在Object obj= new Object ();
这句代码放在for循环的外面,因此每次循环插入的时候,Hibernate认为只是一个对象,主键被更新,因此报错,如果放在for循环里面,就正常了,每次插入都是一个新的对象.
正确的代码如下

public void insertRelation(Object obj,List list1)
	{
		
		for (int i = 0; i < list1.size(); i++) 
		{
                      Object obj= new Object ();

		    service.insert(obj);
		}
		
	}
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评论
1 楼 cl1154781231 2011-01-28  
学习了!
原来是因为
一个事务中更新了主键,而主键是不能被更新的.

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