S2SH整合注入@Autowired出现expected single matching bean but found 2: [iDAO, areaDAO]

异常信息如下:

2012-9-8 14:42:57 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class

org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'areaManager':

Autowiring of fields failed; nested exception is org.springframework.beans.factory.BeanCreationException:

Could not autowire field: protected com.cn.common.base.IDAO com.cn.common.base.ManagerImpl.iDAO; nested

exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type

[com.cn.common.base.IDAO] is defined: expected single matching bean but found 2: [iDAO, areaDAO]
 at

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessAfterInstanti

ation(AutowiredAnnotationBeanPostProcessor.java:243)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean

(AbstractAutowireCapableBeanFactory.java:959)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean

(AbstractAutowireCapableBeanFactory.java:472)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run

(AbstractAutowireCapableBeanFactory.java:409)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean

(AbstractAutowireCapableBeanFactory.java:380)
 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject

(AbstractBeanFactory.java:264)
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton

(DefaultSingletonBeanRegistry.java:222)
 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean

(AbstractBeanFactory.java:261)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean

(AbstractBeanFactory.java:185)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean

(AbstractBeanFactory.java:164)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons

(DefaultListableBeanFactory.java:429)
 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization

(AbstractApplicationContext.java:728)
 at org.springframework.context.support.AbstractApplicationContext.refresh

(AbstractApplicationContext.java:380)
 at org.springframework.web.context.ContextLoader.createWebApplicationContext

(ContextLoader.java:255)
 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
 at org.springframework.web.context.ContextLoaderListener.contextInitialized

(ContextLoaderListener.java:45)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
 at org.apache.catalina.core.StandardService.start(StandardService.java:516)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected

com.cn.common.base.IDAO com.cn.common.base.ManagerImpl.iDAO; nested exception is

org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type

[com.cn.common.base.IDAO] is defined: expected single matching bean but found 2: [iDAO, areaDAO]
 at

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.in

ject(AutowiredAnnotationBeanPostProcessor.java:435)
 at org.springframework.beans.factory.annotation.InjectionMetadata.injectFields

(InjectionMetadata.java:105)
 at

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessAfterInstanti

ation(AutowiredAnnotationBeanPostProcessor.java:240)
 ... 40 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type

[com.cn.common.base.IDAO] is defined: expected single matching bean but found 2: [iDAO, areaDAO]
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency

(DefaultListableBeanFactory.java:621)
 at

org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.in

ject(AutowiredAnnotationBeanPostProcessor.java:412)
 ... 42 more
2012-9-8 14:42:57 org.apache.catalina.core.ApplicationContext log

说明如下:有一个公共的dao层接口(IDAO)及其实现类(DAOImpl)和service层接口(IManager)及其实现类(ManagerImpl)

IDAO.java如下:

public interface IDAO {
  public void add(Object obj);

}

DAOImpl.java如下:

public class DAOImpl implements IDAO {
  @Autowired
  protected HibernateTemplate ht;

  public void add(Object obj) {
   ht.save(obj);
  }

}

IManager.java如下:

public interface IManager {
  public void add(Object obj);

}

ManagerImpl.java如下:

public class ManagerImpl implements IManager {
 @Autowired
 protected IDAO iDAO;
 
  public void add(Object obj) {
   iDAO.add(obj);
  }

}

现在有一个area类,以及dao层接口实现类,service层接口实现类,分别继承以上相应的接口或者类,AreaManagerImpl.java

代码如下:

 public class AreaManagerImpl extends ManagerImpl implements IAreaManager {
  @Autowired
  private IAreaDAO areaDAO;

  //此方法为AreaDAO接口方法

  public List<Area> getAreaListByFather(Integer father) {
   return areaDAO.getAreaListByFather(father);
  }

}

===========================主要JAVA文件结束=====================

spring配置:

<context:annotation-config />

<bean id="iDAO" class="com.cn.common.base.DAOImpl" />
<bean id="areaManager" class="com.cn.common.area.service.AreaManagerImpl" />
<bean id="areaDAO" class="com.cn.common.area.dao.AreaDAOImpl" />

启动tomcat后报以上的异常,求各位大神,小弟不胜感激,谢谢了