Question

@Controller

@Controller
public class ControllerClass {
    @Autowired
    ServiceClass serviceClass;

    @RequestMapping("/")
    public String getAll(Model model) {
        System.out.println(serviceClass.getAll());
        model.addAttribute("contents", serviceClass.getAll());
        return "NewFile";
    }
}

存储库

@Repository
public interface RepositiryClass {

    List<Domain> get();
}

RepoImpl

public class RepoImpl implements RepositiryClass {

    @Override
    public List<Domain> get() {
        List<Domain> dList = new ArrayList<>();
        Domain one = new Domain("testOne", "testTwo");
        Domain two = new Domain("testTwo", "TestOne");
        Domain three = new Domain("three", "three");

        dList.add(one);
        dList.add(two);
        dList.add(three);

        return dList;
    }

@服务

@Service
public interface ServiceClass {

    List<Domain> getAll();
}

ServiceClassImpl

public class ServiceClassImpl implements ServiceClass {

    @Autowired
    RepositiryClass repositriyClass;

    @Override
    public List<Domain> getAll() {

        return repositriyClass.get();
    }

}

异常

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'controllerClass': Unsatisfied dependency expressed through field 'serviceClass': No qualifying bean of type [com.controller.domain.service.ServiceClass] found for dependency [com.controller.domain.service.ServiceClass]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.controller.domain.service.ServiceClass] found for dependency [com.controller.domain.service.ServiceClass]: 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:573)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)

根本原因

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'serviceClassImpl': Unsatisfied dependency expressed through field 'repositriyClass': No qualifying bean of type [com.controller.domain.repo.RepositiryClass] found for dependency [com.controller.domain.repo.RepositiryClass]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.controller.domain.repo.RepositiryClass] found for dependency [com.controller.domain.repo.RepositiryClass]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
    org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)

的web.xml

<servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

的DispatcherServlet-servlet.xml中

<mvc:annotation-driven />
    <context:component-scan base-package="com.*" />
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

包裹声明

搜索各种表格后，我仍然无法解决这个问题为什么我得到这个错误，因为我已经实现了所有，但仍然不确定为什么我会收到此错误以及如何解决这个问题。

由于

Answer 1

将@Service注释添加到ServiceClassImpl。不是界面。

@Service
public class ServiceClassImpl implements ServiceClass {

    @Autowired
    RepositiryClass repositriyClass;

    @Override
    public List<Domain> getAll() {

        return repositriyClass.get();
    }

}

接口：

public interface ServiceClass {

    List<Domain> getAll();
}

还将@Repository注释添加到存储库实现：

@Repository
public class RepoImpl implements RepositiryClass {

    @Override
    public List<Domain> get() {
        List<Domain> dList = new ArrayList<>();
        Domain one = new Domain("testOne", "testTwo");
        Domain two = new Domain("testTwo", "TestOne");
        Domain three = new Domain("three", "three");

        dList.add(one);
        dList.add(two);
        dList.add(three);

        return dList;
    }
}

不是界面：

public interface RepositiryClass {

    List<Domain> get();
}

请记住：Annotation始终属于Interfaces的实现。不是界面本身

创建bean时出错：表达不满意的依赖关系

1 个答案: