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

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

Session 中有存在相同主键的实体！

解决方法：

将方法： 

  getHibernateTemplate().save(object) ，

getHibernateTemplate().update(object)，

改为：            getHibernateTemplate().merge(object)