求教，struts2问题

最近由struts1.x 转学struts2，发现变化好大，一个简单的demo都搞不定，
tomcat 访问 出现：The requested resource (/UploadSample/) is not available，，，

struts.xml配置:

<?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>
			<package name="fileUploadDemo" extends="struts-default">

						<action name="myUpload"
									class="org.UploadAction">
									<interceptor-ref
												name="fileUpload">
												<param
															name="allowedTypes">
															image/jpg,image/bmp,image/png,image/gif,image/jpeg
												</param>
									</interceptor-ref>
									<interceptor-ref
												name="defaultStack" />
									<result name="input">
												upload.jsp
									</result>
									<result>showUpload.jsp</result>
						</action>
			</package>
</struts>

web.xml配置:

<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE web-app
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">
<web-app>

			<display-name>struts2上传文件示例</display-name>

			<filter>
						<filter-name>struts-cleanup</filter-name>
						<filter-class>
									org.apache.struts2.dispatcher.ActionContextCleanUp
						</filter-class>
			</filter>

			<filter>
						<filter-name>struts2</filter-name>
						<filter-class>
									org.apache.struts2.dispatcher.FilterDispatcher
						</filter-class>
			</filter>



			<!--  注意顺序	-->
			<filter-mapping>
						<filter-name>struts-cleanup</filter-name>
						<url-pattern>/*</url-pattern>
			</filter-mapping>


			<filter-mapping>
						<filter-name>struts2</filter-name>
						<url-pattern>/*</url-pattern>
			</filter-mapping>

			<welcome-file-list>
						<welcome-file>upload.jsp</welcome-file>
			</welcome-file-list>
</web-app>

具体的类已经编译通过，
什么问题呢？