2. springboot启动报错：Field userMapper in com.service.UserService required a bean of type 'com.dao.UserMapper' that could not be found.

报错信息：

2018-06-25 14:26:17.103  WARN 49752 --- [  restartedMain] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'centerController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'userMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.dao.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2018-06-25 14:26:17.105  INFO 49752 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2018-06-25 14:26:17.119  INFO 49752 --- [  restartedMain] utoConfigurationReportLoggingInitializer :

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-06-25 14:26:17.228 ERROR 49752 --- [  restartedMain] o.s.b.d.LoggingFailureAnalysisReporter   :

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APPLICATION FAILED TO START
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Description:

Field userMapper in com.service.UserService required a bean of type 'com.dao.UserMapper' that could not be found.

Action:

Consider defining a bean of type 'com.dao.UserMapper' in your configuration.

解决方法：

1.检查接口类有没加上注解@Mapper