由於目前好像還沒有支持struts2的插件，所以就上網找了一些資料解決在myeclipse中配置struts2（瞭解到struts2必須要在jdk1.6和tomcat6.x）。於是就安裝網上的許多版本開始配置，都說簡單struts2小程序配置過程中只需導入的struts2的包有5個：struts2-core.jar，commons-logging.jar，freemarker.jar，ognl.jar，xwork.jar。安裝實例配置好以後，開始運行，可是出現一下錯誤：
2010-4-1 23:29:41 org.apache.catalina.core.StandardContext filterStart
嚴重: Exception starting filter struts
Unable to load configuration. - bean - jar:file:/D:/Program%20Files/tomcat-6.0.18/webapps/OA/WEB-INF/lib/struts2-core-2.1.8.1.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: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(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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 configuration. - bean - jar:file:/D:/Program%20Files/tomcat-6.0.18/webapps/OA/WEB-INF/lib/struts2-core-2.1.8.1.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)
... 28 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:/Program%20Files/tomcat-6.0.18/webapps/OA/WEB-INF/lib/struts2-core-2.1.8.1.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)
... 30 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/RequestContext
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getDeclaredConstructors(Class.java:1836)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:211)
... 33 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.fileupload.RequestContext
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(ClassLoader.java:320)
... 37 more
2010-4-1 23:29:41 org.apache.catalina.core.StandardContext start
嚴重: Error filterStart
2010-4-1 23:29:41 org.apache.catalina.core.StandardContext start
嚴重: Context [/OA] startup failed due to previous errors
2010-4-1 23:29:41 org.apache.catalina.core.ApplicationContext log
信息: Closing Spring root WebApplicationContext
2010-4-1 23:29:41 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2010-4-1 23:29:41 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2010-4-1 23:29:41 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/32 config=null
2010-4-1 23:29:41 org.apache.catalina.startup.Catalina start
信息: Server startup in 2667 ms
開始時上網找了許多的資料，可一般都沒有解決辦法，或是給的方法沒用，熬了我一兩個小時，後來我自己仔細分析了下錯誤，發現錯誤中指明struts-default.xml:47:178，struts2-core.jar包中的struts-default文件的47行有問題，於是我打開struts-default.xml，47行爲：
<bean type="org.apache.struts2.dispatcher.multipart.MultiPartRequest" name="struts" class="org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest" scope="default"/>
發現要加載org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest。查看這個類的源文件
其中前面有這樣幾句 ：
package org.apache.struts2.dispatcher.multipart;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts2.StrutsConstants;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
public class JakartaMultiPartRequest implements MultiPartRequest {
//下面略
在這個類中必須引入org.apache.commons.fileupload.*;
而錯誤也許沒有加載這個文件上傳包所以找不到類 。
於是我就把commons-ileupload.jar 和 commons-io.jar 導入，結果錯誤解決了。
在這裏記錄一下，提示自己和讀者們，有時分析源代碼也是一種很好的解決問題的方向。
來自：http://apps.hi.baidu.com/share/detail/16238107
個人感覺這種方法很好，所以轉載了！