Hibernate异常：query specified join fetching, but the owner of the fetched association was not present in the select list

 

org.hibernate.QueryException: query specified join fetching, but the owner of the fetched association was not present in the select list

 

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报这个异常是因为查询时返回的对象不包含有该join fetch后面的对象，因此可以将fetch删除就可以啦。这里的fetch就是将fetch后面的对象setter到查询返回的对象中。因此当不存在包含时，就会该报错！

 

 

//这里Student和Teacher为双向多对多关系 Query q = s.createQuery("select t from Student s left join fetch s.teachers t where t.id=1"); 这时就会报错啦！