通过字段“Dashboard Service”表示的未满足的依赖关系；应至少有1个bean可以作为autowire候选项

Question

我知道这个问题已经被问了很多次了，但我真的很难找到正确的解决方法。我已经尝试了这么多的东西，看到这些问题，但似乎没有一个符合我的情况。

完整日志错误如下：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-09-20 12:28:25.613 ERROR 10152 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Field dashboardService in com.timmi.springBoot.controllers.RestEndPoints required a bean of type 'com.timmi.springBoot.service.DashboardService' that could not be found.


Action:

Consider defining a bean of type 'com.timmi.springBoot.service.DashboardService' in your configuration.

[WARNING] 
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:496)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'restEndPoints': Unsatisfied dependency expressed through field 'dashboardService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.timmi.springBoot.service.DashboardService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)
    at com.timmi.springBoot.controllers.Application.main(Application.java:20)
    ... 6 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.timmi.springBoot.service.DashboardService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1506)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583)
    ... 25 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

以下是我当前的实现：

SpringBootApplication：

@SpringBootApplication
@EnableJpaRepositories(basePackages="com.timmi.springBoot.repositories")
@EntityScan(basePackages="com.timmi.springBoot.entities")
@EnableAutoConfiguration
@ComponentScan(basePackages="com.timmi.springBoot.service")
public class Application extends SpringBootServletInitializer {

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

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        // TODO Auto-generated method stub
        return super.configure(builder);
    }
}

@RestController
@RequestMapping("/app")
public class RestEndPoints {

    @Value("${default.course.name}")
    private String cName;

    @Value("${default.course.chapterCount}")
    private int chaptersCount;

    @Autowired
    private CourseConfiguration courseConfiguration;

    @Autowired
    private DashboardService dashboardService;

    @RequestMapping("/employees")
    public List<EmployeeInformation> getAllEmpl(){

        return dashboardService.getAllEmployee();

    }
}

DashboardService接口：

public interface DashboardService{

    List<CompanyRevenue> getTodayRevenueDash();

    List<ProductCategory> getBestCategory();

    List<OrderRecieved> getAllOrderRecieved();

    List<OrderCollectionStatus> getOrderCollection();

    List<EmployeeInformation> getAllEmployee();

    void addEmployee(EmployeeInformation employeeInformation);

    EmployeeInformation updateEmployee(EmployeeInformation employeeInformation);

    void deleteEmployee(EmployeeInformation employeeInformation);

}

类服务：

@Service
public class DashboardServiceImpl implements DashboardService{

    @Autowired
    private CompanyRevenueRepository companyRevenueRepository;

    @Autowired
    private EmployeeInformationRepository employeeInformationRepository;

    @Autowired
    private OrderCollectionStatusRepository OrderCollectionStatusRepository;

    @Autowired
    private OrderRecievedRepository orderRecievedRepository;

    @Autowired
    private ProductCategoryRepository productCategoryRepository;

    @Override
    public List<CompanyRevenue> getTodayRevenueDash() {
        return companyRevenueRepository.findAll();
    }

    @Override
    public List<ProductCategory> getBestCategory() {
        return productCategoryRepository.findByBestCategory(true);
    }

    @Override
    public List<OrderRecieved> getAllOrderRecieved() {
        return orderRecievedRepository.findAll();
    }

    @Override
    public List<OrderCollectionStatus> getOrderCollection() {
        return OrderCollectionStatusRepository.findAll();
    }

    @Override
    public List<EmployeeInformation> getAllEmployee() {
        return employeeInformationRepository.findAll();
    }

    @Override
    public void addEmployee(EmployeeInformation employeeInformation) {
        employeeInformationRepository.save(employeeInformation);
    }

    @Override
    public EmployeeInformation updateEmployee(EmployeeInformation employeeInformation) {
        return employeeInformationRepository.save(employeeInformation);
    }

    @Override
    public void deleteEmployee(EmployeeInformation employeeInformation) {
        employeeInformationRepository.delete(employeeInformation);
    }

}

Answer 1

从DashboardService中删除@repository和@qualifier；从DashboardServiceImpl中删除@component

请熟悉这些注释：Spring中的@Component、@Repository和@Service注释有什么区别？