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Application-Context 设置正确！

这是我的课堂场景

public interface IManager
{
 public void doStuff();
}

@Component
public abstract class ManagerAction implements IManager
{
  @Async
  @Override
  public void doStuff()
  {
     //doing stuff
  }

  public abstract manageWorker();
}

@Component
public class Working extends ManagerAction
{
  @Override
  public manageWorker()
  {
    //some busy code
  }
}

@Component
public class NotWorking extends ManagerAction
{
  @Override
  public manageWorker()
  {
    //some busy code
  }
}

@Service
public class BusinessWorker
{
  @Autowire
  private IManager manager_;

  public void preformTasks()
  {    
    manager_.doStuff();
  }
}

这是我的错误

ERROR [main] (ContextLoader.java:307) - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'BusinessWorker': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.B
eanCreationException: Could not autowire field: private com.background.IManager com.background.BusinessWorker.manager_; nested exception is org.springframework.beans.
factory.NoSuchBeanDefinitionException: No matching bean of type [com.background.IManager] 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)}


Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.background.IManager com.background.BusinessWorker.manager_; 
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.background.IManager] 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:506)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
    ... 28 more

应用上下文

<mvc:annotation-driven />
<task:annotation-driven />
<context:annotation-config />
<context:component-scan base-package="com.background" />
4

1 回答 1

4

错误消息说明了一切：您尝试自动装配 IManager 的一个实例，但是两个不同的 Spring 组件实现了这个接口，所以 Spring 不知道要自动装配哪一个。您需要使用 @Qualifier 注解来指定您希望 Spring 自动装配哪一个。

于 2012-10-12T21:15:48.057 回答