a different object with the same identifier value was already associated with the session

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报下面这个错误，对hibernate的了解甚少，遇到了这个问题，记录一下吧。

HTTP Status 500 - a different object with the same identifier value was already associated with the session: [com.szu.beans.Subject#1]

type Exception report

message a different object with the same identifier value was already associated with the session: [com.szu.beans.Subject#1]

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.szu.beans.Subject#1]org.hibernate.engine.internal.StatefulPersistenceContext.checkUniqueness(StatefulPersistenceContext.java:686)org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:293)org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:239)org.hibernate.event.internal.DefaultUpdateEventListener.performSaveOrUpdate(DefaultUpdateEventListener.java:55)org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)org.hibernate.internal.SessionImpl.fireUpdate(SessionImpl.java:779)org.hibernate.internal.SessionImpl.update(SessionImpl.java:771)org.hibernate.internal.SessionImpl.update(SessionImpl.java:767)

代码，注意下面的第31行传入subject时会报错，如果将第31行改为return subjectDao.editSubjectIntrodution(subject2)即不报错了：

下图是 subjectDao.editSubjectIntrodution(subject2)里面的代码：

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