createMBeans: Throwable 急！！！

2010-8-30 11:11:54 org.apache.catalina.mbeans.ServerLifecycleListener createMBeans
严重: createMBeans: Throwable
java.lang.NullPointerException
at java.io.File.<init>(File.java:222)
at org.apache.catalina.core.StandardContext.getBasePath(StandardContext.java:5044)
at org.apache.catalina.core.StandardContext.getServletContext(StandardContext.java:1846)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:335)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:535)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:498)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:656)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:628)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(ServerLifecycleListener.java:278)
at org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(ServerLifecycleListener.java:129)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:703)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2010-8-30 11:11:54 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-8-30 11:11:54 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.29
2010-8-30 11:11:54 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor host-manager.xml
2010-8-30 11:11:54 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml



在server.xml中加了
<Host name="localhost" appBase="webapps"
  unpackWARs="true" autoDeploy="true"
  xmlValidation="false" xmlNamespaceAware="false">

<Context path="" doBase="/community" debug="0" privileged="true"></Context>
  </Host>
就出现这种错误 如果去掉Host中的Context Tomcat就会启动成功 jdk也检查过了 没有问题 这是为什么啊 很急！各位高手帮帮忙啊

你也太不细心了。
doBase="/community"
docBase="/community"
这肯定会导致找不到路径定义而出NPE。