服务器启动时报No bean named 'sessionFactory' is defined，怎么解决呀

bean的配置
<beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop- 2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">    <!-- dao Bean -->
<bean id="customerDaoImpl" class="dao.impl.CustomerDaoImpl" scope="prototype">   
               <property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- service  Bean -->
<bean id="customerServiceImpl" class="service.impl.CustomerServiceImpl">
   <property name="ipager" ref="customerDaoImpl"/>
</bean>其中CustomerDaoImpl继承HibernateDaoSupport---------------------------------------------------------
web.xml<?xml version="1.0" encoding="ISO-8859-1"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <!-- Standard Action Servlet Mapping -->
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <filter>
                <filter-name>OpenSessionInViewFilter</filter-name>
                <filter class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
  </filter>
  
  <filter-mapping>
             <filter-name>OpenSessionInViewFilter</filter-name>
             <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  
    <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:applicationContext-*.xml</param-value>
  </context-param>
  
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app></beans>