请看这是什么问题?各位高手帮帮忙啊

我用Spring+Hibernate+Struts做了一个工程TestSpring,其实就是一个登陆界面,可是出现了如下错误,请问是怎么回事?
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error creating bean with name '/login' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'service' while setting bean property 'service'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'service' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'userDao' while setting bean property 'userDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'userDao' is defined
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name '/login' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'service' while setting bean property 'service'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'service' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Cannot resolve reference to bean 'userDao' while setting bean property 'userDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'userDao' is defined
org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:190)
org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1046)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:857)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:378)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:252)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:149)
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:541)
org.springframework.web.struts.DelegatingActionProxy.getDelegateAction(DelegatingActionProxy.java:122)
org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:105)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

我的Struts-config为:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
<data-sources />
<form-beans >
<form-bean name="loginForm" type="web.form.LoginForm" />
</form-beans>
<action-mappings >
<action
attribute="loginForm"
input="/login.jsp"
name="loginForm"
path="/login"
scope="request"
type="org.springframework.web.struts.DelegatingActionProxy">
<forward name="success" path="/welcome.jsp" />
<forward name="fail" path="/login.jsp" />
</action>

</action-mappings>
<message-resources parameter="web.ApplicationResources" />
<plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">
<set-property property="contextConfigLocation" value="/WEB-INF/classes/applicationContext.xml" />
</plug-in>
</struts-config>

我的applicationContext.xml为:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
</property>
<property name="url">
<value>jdbc:microsoft:sqlserver://caobaiqing</value>
</property>
<property name="username">
<value>sa</value>
</property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.SQLServerDialect
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>vo/User.hbm.xml</value></list>
</property></bean>
<bean id="UserDAO" class="dao.UserDAO">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="service" class="service.Service"
singleton="false">
<property name="userDao">
<ref bean="userDao" />
</property>
</bean>
<bean name="login"
class="web.action.LoginAction"
singleton="false">
<property name="service">
<ref bean="service" />
</property>
</bean>

</beans>
请问高手是什么问题?
在线急等啊