错误：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
Field categoryMapper in org.csu.mypetstore.service.CatalogService required a bean of type 'org.csu.mypetstore.persistence.CategoryMapper' that could not be found.
在项目的*Application.java文件添加包扫描，扫描接口所在的包
