我不知怎么弄了下tomcat 反正以前运行成功的例子导入再运行，居然出现这样的问题，这是什么情况呢，在线等..........

2011-5-30 11:10:23 org.apache.catalina.core.AprLifecycleListener init
信息: Loaded APR based Apache Tomcat Native library 1.1.20.
2011-5-30 11:10:23 org.apache.catalina.core.AprLifecycleListener init
信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2011-5-30 11:10:23 org.apache.coyote.http11.Http11AprProtocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2011-5-30 11:10:23 org.apache.coyote.ajp.AjpAprProtocol init
信息: Initializing Coyote AJP/1.3 on ajp-8009
2011-5-30 11:10:23 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 908 ms
2011-5-30 11:10:24 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2011-5-30 11:10:24 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.29
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor host-manager.xml
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory ROOT
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory docs
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory examples
2011-5-30 11:10:24 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2011-5-30 11:10:24 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2011-5-30 11:10:24 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory guess
2011-5-30 11:10:25 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory UserLogin
2011-5-30 11:10:25 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory shop
log4j:WARN No appenders could be found for logger (com.opensymphony.xwork2.config.providers.XmlConfigurationProvider).
log4j:WARN Please initialize the log4j system properly.
2011-5-30 11:10:28 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
java.lang.NullPointerException
at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:189)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:479)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:450)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:407)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
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:4001)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4651)
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:546)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
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:445)
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)
2011-5-30 11:10:28 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2011-5-30 11:10:28 org.apache.catalina.core.StandardContext start
严重: Context [/shop] startup failed due to previous errors
2011-5-30 11:10:28 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/shop] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@92668c]) and a value of type [com.opensymphony.xwork2.inject.InternalContext[]] (value [[Lcom.opensymphony.xwork2.inject.InternalContext;@18a9fc8]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
2011-5-30 11:10:28 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/shop] created a ThreadLocal with key of type [com.opensymphony.xwork2.ActionContext.ActionContextThreadLocal] (value [com.opensymphony.xwork2.ActionContext$ActionContextThreadLocal@182c132]) and a value of type [com.opensymphony.xwork2.ActionContext] (value [com.opensymphony.xwork2.ActionContext@159d510]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.