我今天下了北京大学的acm的测试系统，测试时出现了这样的错误。有谁知道是为什么吗????
Exception Occurred

  
Exception stack 
java.lang.NullPointerException
	at com.pku.judgeonline.common.FormattedOut.printHead(Unknown Source)
	at com.pku.judgeonline.servlet.Index.doGet(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:211)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:805)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:696)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:605)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:677)
	at java.lang.Thread.run(Unknown Source)

谁知道能不能看解决办法发到我邮箱:cqqpp@126.com,非常感谢!

• Re:[求助]安装北大的JudgeOnline,出现问题,大家帮帮忙,谢谢! (29) vikenviken 2007-11-21 22:57:04
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• Re:[求助]安装北大的JudgeOnline,出现问题,大家帮帮忙,谢谢! (2567) fang_haiou 2009-12-13 14:23:14