org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘clazzControl

idea 运行 springboot +mybatis 框架 出现的报错：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clazzController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clazzService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clazzMapper' defined in file [C:\Users\QY\Desktop\springboot-mybatis\target\classes\com\mwk\myproject\dao\ClazzMapper.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 [C:\Users\QY\Desktop\springboot-mybatis\target\classes\com\mwk\myproject\mapper\ClassMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [C:\Users\QY\Desktop\springboot-mybatis\target\classes\com\mwk\myproject\mapper\ClassMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Class'.  Cause: java.lang.ClassNotFoundException: Cannot find class: Class

可能原因：
mybatis的*mapper.xml文件没有放在resource文件夹下

解决方案：
创建一个文件夹存放xml文件
其次修改application.properties配置文件

  mybatis.mapper-locations=classpath:mybatis/*.xml 

另外要注意的是DAO接口的类上要加上@PMapper注解