Функция загрузки Spring Boot не работает

Question

Я создал образец приложения Spring Boot, который отлично работает, когда классы обслуживания находятся в одном пакете, но если класс Service относится к другому классу обслуживания в другом пакете, тогда я получаю BeanCreationException

кодекс по применению приведена ниже

Main.java

@SpringBootApplication 
public class Main { 

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

    } 
} 

MyRunner

@Component 
@ComponentScan(basePackages ="com.springboot.helloworld") 
public class MyRunner implements CommandLineRunner { 

    @Autowired 
    private GreeterService greeterService; 

    @Override 
    public void run(String... args) throws Exception { 
     System.out.println(greeterService.greetGuest("John Doe")); 
    } 
} 

GreeterService и GreeterServiceImpl находятся в com.springboot.helloworld.Greeter

@Service 
public class GreeterServiceImpl implements GreeterService { 

    @Autowired 
    Sample service; 
    @Override 
    public String greetGuest(String greeter) { 

     if (greeter == null) { 
      return "Looged in as Guest"; 
     } 

     return "Hello " + greeter + " How are you?"; 
    } 

} 

образца и SampleImpl находятся в другом пакете com.springboot.helloworld.Sampler

Ошибка ПОЛУЧАЛ является

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'greeterServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.springboot.helloworld.Sampler.Sample com.springboot.helloworld.Greeter.GreeterServiceImpl.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) 
    at com.springboot.helloworld.Main.main(Main.java:10) 
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.springboot.helloworld.Sampler.Sample com.springboot.helloworld.Greeter.GreeterServiceImpl.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561) 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) 
    ... 15 common frames omitted 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533) 
    ... 17 common frames omitted 

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'greeterServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.springboot.helloworld.Sampler.Sample com.springboot.helloworld.Greeter.GreeterServiceImpl.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) 
    at com.springboot.helloworld.Main.main(Main.java:10) 
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.springboot.helloworld.Sampler.Sample com.springboot.helloworld.Greeter.GreeterServiceImpl.service; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561) 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) 
    ... 15 more 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springboot.helloworld.Sampler.Sample] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533) 
    ... 17 more 

Answer 1

Ваше приложение явно ожидает аргумент командной строки, и вы не производите его.

Answer 2

попробовать это Java Главная Джек

вы получите Hello Jack Как вы?

Answer 3

Вы должны использовать @Component аннотаций что-то вроде ниже:

@ComponentScan({"com.springboot.helloworld","service"})