按照老师的注解方式运行出错，前面几节都没问题
org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: teacher, for columns: [org.hibernate.mapping.Column(students)]
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org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: teacher, for columns: [org.hibernate.mapping.Column(students)]
2016-10-02
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