tomcat下配置struts2的Unable to load configuration. - bean - jar:file问题

今天在用tomcat配置struts2的时候发现一个之前在resin下没有发现的问题。
先说说环境。
我的环境是myeclipse6.5+tomcat6.0.26+struts2.1.8。
创建了一个web project后将
commons-logging-1.0.4.jar
freemarker-2.3.15.jar
ongl-2.7.3.jar
struts2-core-2.1.8.1.jar
xwork-2.1.6.jar
这几个jar包拷贝到工程下的/WEB-INF/lib/文件夹后然后配置好web.xml和struts.xml后启动tomcat报出了
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严重: Exception starting filter struts2
Unable to load configuration. - bean - jar:file:/D:/apache-tomcat-6.0.26/webapps/testSSI/WEB-INF/lib/struts2-core-2.1.8.jar!/struts-default.xml:47:178
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:431)
    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
    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:519)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: Unable to load configuration. - bean - jar:file:/D:/apache-tomcat-6.0.26/webapps/testSSI/WEB-INF/lib/struts2-core-2.1.8.jar!/struts-default.xml:47:178
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:374)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418)
    ... 19 more
Caused by: Unable to load bean: type:org.apache.struts2.dispatcher.multipart.MultiPartRequest class:org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest - bean - jar:file:/D:/apache-tomcat-6.0.26/webapps/testSSI/WEB-INF/lib/struts2-core-2.1.8.jar!/struts-default.xml:47:178
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:221)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:169)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
    ... 21 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/RequestContext
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getDeclaredConstructors(Unknown Source)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:211)
    ... 24 more
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这样的错误。这个是在resin下运行时候没有遇到的。不知道和webserver的版本是不是有些关系。
之后查了查原来是少了一个commons-fileupload-1.2.1.jar。于是从struts的lib中把这个jar包拷贝到工程的lib下再重启tomcat问题解决了。