mybatis Field xxxMapper in xxxx required a bean of type 'XXXMapper' that could not be found.

错误如下：

2017-05-11 16:15:32.410 [main] INFO  o.a.catalina.core.StandardService - Stopping service Tomcat
2017-05-11 16:15:32.457 [main] INFO  o.s.b.a.l.AutoConfigurationReportLoggingInitializer -

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-05-11 16:15:32.726 [main] ERROR o.s.b.d.LoggingFailureAnalysisReporter -

***************************
APPLICATION FAILED TO START
***************************

Description:

Field xxxMapper in XXXX required a bean of type 'XXXMapper' that could not be found.

Action:

Consider defining a bean of type 'XXXMapper' in your configuration.

Process finished with exit code 1

使用Spring boot或Spring cloud配置mybatis，我用的是mybatis-generator插件自动生成实体和DAO层以及XML文件，最后启动时报了上面的错误，解决方法是在你的启动程序上加上这么一句：

@MapperScan("xxx.mapper")
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

在Application类的上面，也就是配置你的mapper的路径。