struts2 整合 spring 时遇到的问题

eclipse3环境下：
严重: Exception starting filter struts2
Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/D:/WORKSPACE/WKSP/PROJECTS/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Ssh2Demo/WEB-INF/lib/struts2-core-2.1.2.jar!/struts-default.xml:29:72
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:208)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:131)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:201)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
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:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/D:/WORKSPACE/WKSP/PROJECTS/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Ssh2Demo/WEB-INF/lib/struts2-core-2.0.11.2.jar!/struts-default.xml:30:72 - bean - jar:file:/D:/WORKSPACE/WKSP/PROJECTS/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/Ssh2Demo/WEB-INF/lib/struts2-core-2.1.2.jar!/struts-default.xml:29:72
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:193)
... 24 more配置如下：
applicationContext.xml
------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC 
       "-//SPRING//DTD BEAN//EN"
       "http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="byName">
       <bean id="list" class="tutorial.web.action.BookAction" singleton="false"/>
       <bean id="edit" class="tutorial.web.action.BookAction" singleton="false"/>
       <bean id="store" class="tutorial.web.action.BookAction" singleton="false"/>
       <bean id="remove" class="tutorial.web.action.BookAction" singleton="false"/>       
</beans>web.xml
--------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Struts 2 Fileupload</display-name> <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/applicationContext.xml
</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener> <filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter> <filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> <welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list></web-app>
-------------------
struts.xml
-------------------
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>
<constant name="struts.objectFactory" value="spring" />
    <package name="Struts2_CRUD_DEMO" extends="struts-default" namespace="/Book">
        <action name="List" class="list" method="list">
            <result>List.jsp</result>
        </action>
        <action name="Edit" class="edit" method="load">
            <result>Edit.jsp</result>
        </action>
        <action name="Store" class="store" method="store">
            <result type="redirect">List.action</result>
        </action>
        <action name="Remove" class="remove" method="remove">
            <result type="redirect">List.action</result>
        </action>
    </package>
</struts>