报错信息：

Exception in thread “main” org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.feng.mybatisplusdemo.dao.UserMapper’ available

解决办法：

将原来引入的MybatisPlus依赖：

        <dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.2</version></dependency>

更改为（SpringBoot3以上）：

        <dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-spring-boot3-starter</artifactId><version>3.5.9</version></dependency>