Consider defining a bean of type 'xx.xx.dao.UserDao' in your configuration.

Consider defining a bean of type 'xx.xx.dao.UserDao' in your configuration.

首先因为没配数据源的问题在Application启动类上加了@SpringBootApplication(exclude = {DataSourceAutoconfiguration.class})，解决启动报错的问题，后来数据源配好忘了去掉，所以后来变报了这个错，花了不少时间找原因。 启动报这个错

ERROR 13304 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPLICATION FAILED TO START *************************** Description: Field userDao in cn.first.service.ServiceImp.UserServiceImp required a bean of type 'xx.xx.dao.UserDao' that could not be found. Action: Consider defining a bean of type 'xx.xx.dao.UserDao' in your configuration. Process finished with exit code 1

一开始以为注入有问题，但@Mapper注解也有，因为用的是idea所以注入时有警告 解决办法在@Mapper下加@Component注解

最后把此前启动类上的@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})改回@SpringBootApplication 启动成功