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以下是我的代碼，這似乎沒給我，但它給錯誤HTTP狀態500運行時。request.getUserPrincipal（）的getName（）導致錯誤500
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out=response.getWriter();
String name=request.getParameter("name");
String password=request.getParameter("pass");
request.login(name, password);
out.print("<br/>Get Authentication: "+request.getAuthType());
out.print("<br/>Get Remote User: "+request.getRemoteUser());
out.print("<br/>Get User Principal: "+request.getUserPrincipal().getName());
out.print("<br/>Get Authentication: "+request.getAuthType());
下面是完整的堆棧Trace-
Sep 24, 2014 12:05:40 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_25\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jdk1.7.0_25/bin/../jre/bin/server;C:/Program Files/Java/jdk1.7.0_25/bin/../jre/bin;C:/Program Files/Java/jdk1.7.0_25/bin/../jre/lib/amd64;C:\Program Files\Dell\DW WLAN Card;;C:\Program Files\Java\jdk1.7.0_25\bin;c:\Program Files\WIDCOMM\Bluetooth Software\;c:\Program Files\WIDCOMM\Bluetooth Software\syswow64;;E:\Soft\Java soft\eclipse;;.
Sep 24, 2014 12:05:40 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:ResponseHandling' did not find a matching property.
Sep 24, 2014 12:05:40 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Sep 24, 2014 12:05:40 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Sep 24, 2014 12:05:40 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 697 ms
Sep 24, 2014 12:05:40 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Sep 24, 2014 12:05:40 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.26
Sep 24, 2014 12:05:40 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Sep 24, 2014 12:05:40 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Sep 24, 2014 12:05:40 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 388 ms
Sep 24, 2014 12:05:46 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [RequestHandlingOperation] in context with path [/ResponseHandling] threw exception [Login failed] with root cause
javax.servlet.ServletException: Login failed
at org.apache.catalina.authenticator.AuthenticatorBase.doLogin(AuthenticatorBase.java:820)
at org.apache.catalina.authenticator.AuthenticatorBase.login(AuthenticatorBase.java:800)
at org.apache.catalina.connector.Request.login(Request.java:2612)
at org.apache.catalina.connector.RequestFacade.login(RequestFacade.java:1064)
at pack2.RequestHandlingOperation.doPost(RequestHandlingOperation.java:22)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)