关于springboot的mapper注解扫描不到

一直找不到@Mapper注解，只有@Mapperscan。

解决方法：

<dependency >

<groupId > org.mybatis </groupId >

<artifactId > mybatis </artifactId >

<version > 3.4.5 </version >

</dependency >

<dependency >

<groupId > org.mybatis </groupId >

<artifactId > mybatis-spring </artifactId >

<version > 1.3.1 </version >

</dependency >

将pom.xml里面的替换成上面的

BUT我要说的不是这个问题

Description:
Field studentMapper in com.example.service.impl.StudentServiceImpl required a bean of type 'com.example.mapper.StudentMapper' that could not be found.
Action:
Consider defining a bean of type 'com.example.mapper.StudentMapper' in your configuration.
这个问题试过无数个方法不知道怎么解决，求解！！！！