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

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Struts2 报 Unable to load configguration. - bean 的错误，肯定是因为缺少所需的类库的引起的，可以根据错误信息的提示增加所需的类库即可。

使用MyEclipse 7.0做了一个Struts HelloWorld ，过程虽简单，无奈老出问题，经过多次测试，终于找到问题症结。

1．类库包：

commons-logging-1.0.4.jar
freemarker-2.3.13.jar
ognl-2.6.11.jar
struts2-core-2.1.6.jar
xwork-2.1.2.jar

2．web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
         <display-name>first Struts 2 Project</display-name>
    <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>
</web-app>

3．index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<h1>HelloWorld</h1>

就以上几个文件，在启动Tomcat时老是报异常如下：

严重: Exception starting filter struts2
Unable to load configuration. - bean - jar:file:/D:/Tomcat6.0/webapps/ss/WEB-INF/lib/struts2-core-2.1.6.jar!/struts-default.xml:46:178
         at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
         at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:360)
         at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:403)
         at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)
         at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
         at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
         at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
         at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
         at org.apache.catalina.core.StandardContext.start(StandardContext.java:4363)
         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(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:288)
         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: Unable to load bean: type:org.apache.struts2.dispatcher.multipart.MultiPartRequest class:org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest - bean - jar:file:/D:/Tomcat6.0/webapps/ss/WEB-INF/lib/struts2-core-2.1.6.jar!/struts-default.xml:46:178
         at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:222)
         at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
         at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:165)
         at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
         ... 30 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileUploadException
         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:212)
         ... 33 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileUploadException
         at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
         at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
         at java.lang.ClassLoader.loadClassInternal(Unknown Source)
         ... 37 more
严重: Error filterStart

解决方法：
由于类库中缺少：commons-fileupload-1.2.1.jar

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