org.hibernate.PersistentObjectException: detached entity passed to persist异常
2013-01-29 10:56
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情形:用户注册,或则使用到 sessionFactory.getCurrentSession().persist();方法时候,第一次保存正常,在没有重启下再保存下一个就报 org.hibernate.PersistentObjectException: detached entity passed to persist异常
原因分析:
1。保存第一个的时候已经赋值了id,因为配置了hibernate主键生成策略,主键就不能手动设置了,一旦不为空或者0就被认为是已经保存到了数据库中,导致第二次保存是异常。因为保存的对象不是新new出来的。
2。原因就是我action的作用域设置错误了,我采用了默认单例的设置,对于Action来说必须采用prototype(每次调用创建一个对象)的作用域。
解决办法:在Action上就一个注解@Scope("prototype");或<bean id="personAction" class="cn.itcast.web.action.PersonAction" scope="prototype">
参考:参考文章
原因分析:
1。保存第一个的时候已经赋值了id,因为配置了hibernate主键生成策略,主键就不能手动设置了,一旦不为空或者0就被认为是已经保存到了数据库中,导致第二次保存是异常。因为保存的对象不是新new出来的。
2。原因就是我action的作用域设置错误了,我采用了默认单例的设置,对于Action来说必须采用prototype(每次调用创建一个对象)的作用域。
解决办法:在Action上就一个注解@Scope("prototype");或<bean id="personAction" class="cn.itcast.web.action.PersonAction" scope="prototype">
参考:参考文章
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