JPA错误搜集之Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: cn.it
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错误：Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: cn.itsource.domain.ProductDir
错误原因 我的主键在jpa实体类中的标签里已经设置好了，不能去设置了；
修改 去掉对主键的设置（测试类中注释了）
实体类
测试类
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