我试图让我的第一个JSF页面在服务器的本地实例上运行。我似乎无法导航到我的第一页。我想我已经正确设置了所有设置，但我从未到达过我的页面。
我总是得到一个
“网站无法显示页面”
异常。当我查看控制台以查看可能抛出的异常时，将显示以下内容：
E com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E：[Servlet Error] - [GenericServletWrapper]：javax.portlet.PortletException：java.lang.NullPointerException
和
引起：java.lang.NullPointerException 在java.util.Collections.list（Collections.java:2229）
这两个例外之后都是堆栈跟踪条目，对我没有实际意义。这些似乎是最相关的条目。
这是整个堆栈跟踪：
[12/28/12 8:16:47:719 EST] 00001b27 webapp E com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E: [Servlet Error]-[GenericServletWrapper]: javax.portlet.PortletException: java.lang.NullPointerException
at com.ibm.ws.portletcontainer.invoker.impl.PortletServlet.doDispatch(PortletServlet.java:369)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:82)
at com.ibm.isclite.container.collaborator.PortletServletCollaborator.doDispatch(PortletServletCollaborator.java:143)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:74)
at com.ibm.ws.portletcontainer.rrd.RRDServerPortletServletCollaborator.doDispatch(RRDServerPortletServletCollaborator.java:60)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:74)
at com.ibm.ws.portletcontainer.cache.CacheCollaborator.doDispatch(CacheCollaborator.java:74)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:74)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServlet.dispatch(PortletServlet.java:208)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServlet.service(PortletServlet.java:165)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1214)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:774)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:456)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:125)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:77)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:926)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1023)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:1384)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.include(WebAppRequestDispatcher.java:548)
at com.ibm.ws.portletcontainer.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:214)
at com.ibm.ws.portletcontainer.invoker.impl.PortletInvokerCollaboratorChainImpl.doCollaborator(PortletInvokerCollaboratorChainImpl.java:78)
at com.ibm.ws.portletcontainer.cache.PortletInvokerCacheCollaborator.doRender(PortletInvokerCacheCollaborator.java:58)
at com.ibm.ws.portletcontainer.invoker.impl.PortletInvokerCollaboratorChainImpl.doCollaborator(PortletInvokerCollaboratorChainImpl.java:67)
at com.ibm.ws.portletcontainer.ext.PortletInvokerPerformanceCollaborator.invoke(PortletInvokerPerformanceCollaborator.java:313)
at com.ibm.ws.portletcontainer.ext.PortletInvokerPerformanceCollaborator.doInvoke(PortletInvokerPerformanceCollaborator.java:101)
at com.ibm.ws.portletcontainer.ext.PortletInvokerPerformanceCollaborator.invokePMI(PortletInvokerPerformanceCollaborator.java:163)
at com.ibm.ws.portletcontainer.ext.PortletInvokerPerformanceCollaborator.doInvoke(PortletInvokerPerformanceCollaborator.java:91)
at com.ibm.ws.portletcontainer.ext.PortletInvokerPerformanceCollaborator.doRender(PortletInvokerPerformanceCollaborator.java:74)
at com.ibm.ws.portletcontainer.invoker.impl.PortletInvokerCollaboratorChainImpl.doCollaborator(PortletInvokerCollaboratorChainImpl.java:67)
at com.ibm.ws.portletcontainer.invoker.impl.PortletInvokerImpl.render(PortletInvokerImpl.java:97)
at com.ibm.ws.portletcontainer.PortletContainerImpl.doRender(PortletContainerImpl.java:121)
at com.ibm.ws.portletcontainer.PortletContainerInvokerCollaboratorChainImpl.doCollaborator(PortletContainerInvokerCollaboratorChainImpl.java:80)
at com.ibm.ws.portletcontainer.ext.ExtCollaborator.doRender(ExtCollaborator.java:76)
at com.ibm.ws.portletcontainer.PortletContainerInvokerCollaboratorChainImpl.doCollaborator(PortletContainerInvokerCollaboratorChainImpl.java:67)
at com.ibm.ws.portletcontainer.cache.CacheInvokerCollaborator.doRender(CacheInvokerCollaborator.java:66)
at com.ibm.ws.portletcontainer.PortletContainerInvokerCollaboratorChainImpl.doCollaborator(PortletContainerInvokerCollaboratorChainImpl.java:67)
at com.ibm.ws.portletcontainer.PortletContainerImpl.renderPortlet(PortletContainerImpl.java:91)
at com.ibm.ws.portletcontainer.pcinvoker.PortletInvokerImpl$2.run(PortletInvokerImpl.java:100)
at java.security.AccessController.doPrivileged(AccessController.java:254)
at com.ibm.ws.portletcontainer.pcinvoker.PortletInvokerImpl.invokeRender(PortletInvokerImpl.java:96)
at com.ibm.ws.portletcontainer.portletserving.PortletServingServlet.invokePortletRender(PortletServingServlet.java:280)
at com.ibm.ws.portletcontainer.portletserving.PortletServingServlet.service(PortletServingServlet.java:151)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1214)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:774)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:456)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:125)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:92)
at com.ibm.ws.portletcontainer.portletserving.filter.PortletDocumentFilterContainer.doFilterEnd(PortletDocumentFilterContainer.java:61)
at com.ibm.ws.portletcontainer.portletserving.filter.PortletDocumentFilterChain.doFilter(PortletDocumentFilterChain.java:55)
at com.ibm.ws.portletcontainer.portletserving.filter.DefaultFilter.doFilter(DefaultFilter.java:105)
at com.ibm.ws.portletcontainer.portletserving.filter.PortletDocumentFilterChain.doFilter(PortletDocumentFilterChain.java:49)
at com.ibm.ws.portletcontainer.portletserving.filter.PortletDocumentFilterContainer.doFilter(PortletDocumentFilterContainer.java:52)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:188)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:89)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:926)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1023)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:895)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:195)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1659)
Caused by: java.lang.NullPointerException
at java.util.Collections.list(Collections.java:2229)
at org.apache.myfaces.util.AbstractThreadSafeAttributeMap$AbstractAttributeIterator.<init>(AbstractThreadSafeAttributeMap.java:208)
at org.apache.myfaces.util.AbstractThreadSafeAttributeMap$AbstractAttributeIterator.<init>(AbstractThreadSafeAttributeMap.java:200)
at org.apache.myfaces.util.AbstractThreadSafeAttributeMap$KeyIterator.<init>(AbstractThreadSafeAttributeMap.java:233)
at org.apache.myfaces.util.AbstractThreadSafeAttributeMap$KeyIterator.<init>(AbstractThreadSafeAttributeMap.java:233)
at org.apache.myfaces.util.AbstractThreadSafeAttributeMap$KeySet.iterator(AbstractThreadSafeAttributeMap.java:183)
at org.apache.myfaces.shared_impl.context.flash.SubKeyMap._gatherKeys(SubKeyMap.java:121)
at org.apache.myfaces.shared_impl.context.flash.SubKeyMap.access$000(SubKeyMap.java:44)
at org.apache.myfaces.shared_impl.context.flash.SubKeyMap$Entries.iterator(SubKeyMap.java:146)
at java.util.AbstractMap$1$1.<init>(AbstractMap.java:475)
at java.util.AbstractMap$1.iterator(AbstractMap.java:474)
at com.ibm.faces.trace.TracePhaseListener.getMapDump(TracePhaseListener.java:305)
at com.ibm.faces.trace.TracePhaseListener.getMapDump(TracePhaseListener.java:324)
at com.ibm.faces.trace.TracePhaseListener.getScopeDump(TracePhaseListener.java:379)
at com.ibm.faces.trace.TracePhaseListener.getPhaseDump(TracePhaseListener.java:291)
at com.ibm.faces.trace.TracePhaseListener.beforePhase(TracePhaseListener.java:76)
at com.ibm.faces20.portlet.FacesPortlet.restoreView(FacesPortlet.java:1429)
at com.ibm.faces20.portlet.FacesPortlet.doRender(FacesPortlet.java:480)
at com.ibm.faces20.portlet.FacesPortlet.doView(FacesPortlet.java:540)
at com.ibm.faces20.portlet.FacesPortlet.doDispatch(FacesPortlet.java:412)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServlet.doDispatch(PortletServlet.java:576)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:114)
at com.ibm.isclite.container.collaborator.PortletServletCollaborator.doRender(PortletServletCollaborator.java:71)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:105)
at com.ibm.ws.portletcontainer.rrd.RRDServerPortletServletCollaborator.doRender(RRDServerPortletServletCollaborator.java:123)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:105)
at com.ibm.ws.portletcontainer.cache.CacheCollaborator.doRender(CacheCollaborator.java:92)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServletCollaboratorChainImpl.doCollaborator(PortletServletCollaboratorChainImpl.java:105)
at com.ibm.ws.portletcontainer.invoker.impl.PortletServlet.doDispatch(PortletServlet.java:273)
... 78 more