[Building Sakai] Struts ActionServlet

[KetanNale]

i tried to add Struts ActionServlet .....
i made one entry in web.xml as :

<servlet>
        <servlet-name>sakai.person</servlet-name>
        <servlet-class>
            uk.ac.cam.caret.sakai.WebappToolServlet
        </servlet-class>
        <!-- use this to specify a starting page location if needed -->
        <!--
        <init-param>
            <param-name>main-page</param-name>
            <param-value>/</param-value>
        </init-param>
        -->
        <load-on-startup>2</load-on-startup>
    </servlet>
   
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

but when i started my tomcat
stack trace is as follows :
what can be error.................??

ERROR: Error loading WebappClassLoader
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader at 1060478
 org.apache.struts.action.ActionServlet (2009-04-14 14:43:17,781
main_org.apache.catalina.core.ContainerBase.[Catalina].[loca
lhost].[/person-tool])
java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1386)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1068)
        at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)
        at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3956)
        at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4230)
        at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
        at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
        at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
        at
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:831)
        at
org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:720)
        at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
        at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
        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)
ERROR: Servlet /person-tool threw load() exception (2009-04-14 14:43:19,765
main_org.apache.catalina.core.ContainerBase.[Cata
lina].[localhost].[/person-tool])
java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1386)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1068)
        at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)
        at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3956)
        at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4230)
        at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
        at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
        at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
        at
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:831)
        at
org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:720)
        at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
        at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
        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)



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