SpringBoot项目运行错误：找不到CourseMapper Bean，文件存在，路径也正确，还会是什么原因导致的呢？

Question

Description:

Field courseMapper in com.ztt.bootest.service.impl.CourseServiceImpl required a bean of type 'com.ztt.bootest.mapper.CourseMapper' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.ztt.bootest.mapper.CourseMapper' in your configuration.

以上是我的报错信息，
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.ztt.bootest.mapper.CourseMapper"><mapper>
这是我的xml
spring.application.name=BootTest
server.port=8082

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ktp_db?autoReconnect=true&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=123456

mybatis.mapper-locations=classpath:mapper/*Mapper.xml
mybatis.type-aliases-package=com.ztt.bootest.entity

spring.thymeleaf.check-template=false
spring.thymeleaf.check-template-location=false

mybatis.configuration.map-underscore-to-camel-case=true
这是我的application.properties

这是我自写的一个MyBatis+SpringBoot项目，不知道为什么运行不了，csdn上面的方法我试过了，都解决不了，总感觉是自己哪步比较关键的步骤弄错了，但是自己发现不了
希望哪位大佬帮我发现一下我的错误

Answer 1

看报错是 CourseMapper 没有被注册成为一个bean啊，试试以下两步
1.在启动类加上注解

@MapperScan("com.ztt.bootest.mapper")

2.在 CourseMapper 这个类上加上 @Repository 注解