Caused by: org.hibernate.HibernateException: identifier of an instance of ... is alterde from

Hibernate的提示错误
Caused by: org.hibernate.HibernateException: identifier of an instance of .[类名]. is alterde from [数字] to [数字]

原因：是由于在一个事务中更新了主键,而主键是不能被更新的.