Error when restart tomcat Liferay server

[miii suuu，修改在14 年前。]

Hi,

I get error un-registering portlet when Restart or Shutdown tomcat.I use Liferay 4.3.1 tomcat. Do you have any idea ? Please advise. Thanks a lot

Detail as below:

[myapp] 2010-04-26 09:43:54,963 [main] WARN  LocaleFilter          - LOCALEFILTER: DESTROY
Apr 26, 2010 9:43:54 AM com.liferay.portal.kernel.log.Jdk14LogImpl error
SEVERE: com.liferay.portal.kernel.deploy.hot.HotDeployException: Error unregistering portlets for MyPortlet
com.liferay.portal.kernel.deploy.hot.HotDeployException: Error unregistering portlets for MyPortlet
	at com.liferay.portal.deploy.hot.PortletHotDeployListener.invokeUndeploy(PortletHotDeployListener.java:442)
	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil._fireUndeployEvent(HotDeployUtil.java:100)
	at com.liferay.portal.kernel.deploy.hot.HotDeployUtil.fireUndeployEvent(HotDeployUtil.java:46)
	at com.liferay.portal.kernel.servlet.PortletContextListener.contextDestroyed(PortletContextListener.java:56)
	at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3805)
	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4364)
	at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:893)
	at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1191)
	at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1162)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:313)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1055)
	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1067)
	at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:448)
	at org.apache.catalina.core.StandardService.stop(StandardService.java:510)
	at org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
	at org.apache.catalina.startup.Catalina.stop(Catalina.java:602)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:577)
	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:295)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: java.lang.NullPointerException
	at com.liferay.portal.deploy.hot.PortletHotDeployListener.invokeUndeploy(PortletHotDeployListener.java:384)
	... 23 more
log4j:ERROR LogMananger.repositorySelector was null likely due to error in class reloading, using NOPLoggerRepository.