Spring Boot启动报错

Question

报错类型：

Field xxxDao in xxxServiceImpl required a bean of type xxx that could not be found.

详细情况如下：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.2.RELEASE)

2019-07-19 10:45:06.433  INFO 3644 --- [           main] com.meituan.hotel.Application            : Starting Application on LAPTOP-2N82SD03 with PID 3644 (E:\CodeCache\IDEA\Webmagic\meituan-crawler-hotel\target\classes started by 三寸旧城七寸执念 in E:\CodeCache\IDEA\Webmagic\meituan-crawler-hotel)
2019-07-19 10:45:06.435  INFO 3644 --- [           main] com.meituan.hotel.Application            : No active profile set, falling back to default profiles: default
2019-07-19 10:45:06.472  INFO 3644 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@197d671: startup date [Fri Jul 19 10:45:06 CST 2019]; root of context hierarchy
2019-07-19 10:45:07.211  INFO 3644 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-07-19 10:45:07.229  INFO 3644 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-07-19 10:45:07.229  INFO 3644 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.31
2019-07-19 10:45:07.232  INFO 3644 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : Loaded APR based Apache Tomcat Native library [1.2.21] using APR version [1.6.5].
2019-07-19 10:45:07.232  INFO 3644 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2019-07-19 10:45:07.232  INFO 3644 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2019-07-19 10:45:07.235  INFO 3644 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.1a  20 Nov 2018]
2019-07-19 10:45:07.351  INFO 3644 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-07-19 10:45:07.351  INFO 3644 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 882 ms
2019-07-19 10:45:07.459  INFO 3644 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2019-07-19 10:45:07.462  INFO 3644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-07-19 10:45:07.462  INFO 3644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-07-19 10:45:07.462  INFO 3644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-07-19 10:45:07.462  INFO 3644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2019-07-19 10:45:07.490  WARN 3644 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'hotelInfoServiceImpl': Unsatisfied dependency expressed through field 'hotelInfoDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.meituan.hotel.Dao.HotelInfoDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2019-07-19 10:45:07.492  INFO 3644 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-07-19 10:45:07.504  INFO 3644 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-19 10:45:07.573 ERROR 3644 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Field hotelInfoDao in com.meituan.hotel.Service.impl.HotelInfoServiceImpl required a bean of type 'com.meituan.hotel.Dao.HotelInfoDao' that could not be found.


Action:

Consider defining a bean of type 'com.meituan.hotel.Dao.HotelInfoDao' in your configuration.


Process finished with exit code 1

最近网项目里面加了个模块，模块是基于gradle的工程，我本身的工程是基于maven的，没有导成功，我就把那个模块删除掉了，但是运行就出问题了，网上搜了很多，但是我的注解都加了，而且目录结构也没有问题，Application.class也的确在包的最外层。

希望有大佬帮忙解答一下

Answer 1

没有找到dao的bean。很明显, 你的hibernate或者mybatis配置的有问题。着重看一下扫描配置那一块

Answer 2

HotelInfoDao 没有这个类？还是说这个类没有加注解 @Repository？还是说加了注解，但是没有被 @ComponentScan 扫描配置扫描到？3层 check 下来应该可以解决你的问题。