求解TOMCAT关闭的原因

2010-05-10 15:04:10 StandardContext[/gat]Closing Spring root WebApplicationContext
2010-05-10 15:04:10 StandardContext[/gat]Servlet action threw unload() exception
javax.servlet.ServletException: Servlet.destroy() for servlet action threw exception
at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1268)
at org.apache.catalina.core.StandardWrapper.stop(StandardWrapper.java:1580)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:952)
at org.apache.catalina.core.StandardContext.removeChild(StandardContext.java:3148)
at org.apache.catalina.startup.ContextConfig.stop(ContextConfig.java:676)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:218)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:952)
at org.apache.catalina.core.StandardHostDeployer.remove(StandardHostDeployer.java:670)
at org.apache.catalina.core.StandardHost.remove(StandardHost.java:946)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1028)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1005)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:351)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1123)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1135)
at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:483)
at org.apache.catalina.core.StandardService.stop(StandardService.java:542)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2347)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:605)
at org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:648)
----- Root Cause -----
java.lang.NullPointerException
at com.bornsoft.oa.action.SpecialBaseAction.setServlet(SpecialBaseAction.java:42)
at org.apache.struts.action.RequestProcessor.destroy(RequestProcessor.java:172)
at org.apache.struts.action.ActionServlet.destroyModules(ActionServlet.java:725)
at org.apache.struts.action.ActionServlet.destroy(ActionServlet.java:430)
at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1255)
at org.apache.catalina.core.StandardWrapper.stop(StandardWrapper.java:1580)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:952)
at org.apache.catalina.core.StandardContext.removeChild(StandardContext.java:3148)
at org.apache.catalina.startup.ContextConfig.stop(ContextConfig.java:676)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:218)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4513)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:952)
at org.apache.catalina.core.StandardHostDeployer.remove(StandardHostDeployer.java:670)
at org.apache.catalina.core.StandardHost.remove(StandardHost.java:946)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1028)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1005)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:351)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1123)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1135)
at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:483)
at org.apache.catalina.core.StandardService.stop(StandardService.java:542)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2347)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:605)
at org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:648)2010-05-10 15:04:35 StandardContext[/balancer]org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
2010-05-10 15:04:36 StandardContext[/gat]Loading Spring root WebApplicationContext