org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session: [cn.ac.iscas.core.entity.pm.cm.CmPlanBaseline#]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [cn.ac.iscas.core.entity.pm.cm.CmPlanBaseline#]

at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:)

at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:)

at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:)

at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:)

at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:)

at cn.ac.intec.entity.orm.impl.SessionImpl.saveOrUpdate(SessionImpl.java:)

at cn.ac.intec.entity.orm.impl.SessionImpl.insertOrUpdate(SessionImpl.java:)

at cn.ac.intec.entity.orm.impl.SessionImpl$$FastClassByCGLIB$$550f49cd.invoke(<generated>)

触发场景，解决方案：
1. show业务操作，开启一个session ，从中查出一些实体，这时某个实体是存在于session中的持久化对象。通过业务逻辑将此实体用于页面展示。此时这个session并未关闭。

2. 这时执行一步save业务逻辑，将上一步获得的实体id传回后台 。这时通过new的方式创建了一个临时对象，并且我将传回的id作为主键赋值给了临时对象。然后调用了session.save(obj); 方法 。。。抛出异常。

原因很简单，session中有2个oid一样的对象，hibernate不知道该让哪个持久化到库里。当时解决思路也很清晰，直接clear();清空一下 session缓存不就Ok了。但是clear打击面太广了（慎用！）。其他一些“无辜”对象也被杀掉，导致其他业务无法进行了。

后来在session中发现一个evict方法，“定点清除”对象缓存。这下就好了，先用传回来的id用get方法（其实这里用load方法也行反正都是从缓存中加载）获得session里的持久化实体，然后杀掉，再保存临时实体。没问题了。

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