springboot启动报错信息

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userMapper' defined in file [E:\workspace\idea\源代码\商城项目\mall_review_0\target\classes\com\bo\mall_review\model\dao\UserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\workspace\idea\源代码\商城项目\mall_review_0\target\classes\mappers\CartMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\workspace\idea\源代码\商城项目\mall_review_0\target\classes\mappers\CartMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'me.zhangbo.mall.model.pojo.Cart'. Cause: java.lang.ClassNotFoundException: Cannot find class: me.zhangbo.mall.model.pojo.Cart

问题解决

前后一共两次遇到相似的报错：
1.mapper.xml中同一个功能的sql写了两遍，重复
2.mapper.xml中sql的parameterType写成了→me.zhangbo.mall.model.pojo.Cart，所以出现上面的提示信息
问题主要都是出现在mapper文件中