HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
	com.pku.judgeonline.common.FormattedOut.printSimpleHead(Unknown Source)
	com.pku.judgeonline.common.FormattedOut.printHead(Unknown Source)
	com.pku.judgeonline.servlet.Index.doGet(Unknown Source)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0-snapshot logs.

Apache Tomcat/6.0-snapshot

整个页面就这样