springBoot啓動錯誤：Field categoryMapper in xxx.xxx.service.impl.CategoryServiceImpl required a bean of

springBoot啓動錯誤：Field categoryMapper in com.leyou.service.impl.CategoryServiceImpl required a bean of type ‘com.leyou.mapper.CategoryMapper’ that could not be found. 從字面意思好像是mapper有問題 後來發現在引導類中的@Mapper

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