I get this error today when I was trying to login to cocoon portal server. Can someone please shed some light on this.
An Error Occurred Failed to execute pipeline. org.apache.cocoon.ProcessingException: Failed to execute pipeline.: java.lang.NullPointerException cause: java.lang.NullPointerException full exception chain stacktrace[show] Original Exception: java.lang.NullPointerException at org.apache.cocoon.portal.event.impl.DefaultEventManager.processEvents(Defaul tEventManager.java:293) at org.apache.cocoon.portal.impl.PortalManagerImpl.process(PortalManagerImpl.ja va:86) at org.apache.cocoon.portal.impl.PortletPortalManager.process(PortletPortalMana ger.java:228) at org.apache.cocoon.portal.generation.PortalGenerator.generate(PortalGenerator .java:94) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLP ipeline(AbstractProcessingPipeline.java:581) at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline .processXMLPipeline(AbstractCachingProcessingPipeline.java:196) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(Abs tractProcessingPipeline.java:525) at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(Seri alizeNode.java:155) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTyp eNode.java:173) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNod e.java:133) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.Cocoon.process(Cocoon.java:656) at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1112) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve. java:171) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :174) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:392) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:619) at java.lang.Thread.run(Thread.java:536) stacktrace[show] org.apache.cocoon.ProcessingException: Failed to execute pipeline.: java.lang.NullPointerException at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLP ipeline(AbstractProcessingPipeline.java:588) at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline .processXMLPipeline(AbstractCachingProcessingPipeline.java:196) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(Abs tractProcessingPipeline.java:525) at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(Seri alizeNode.java:155) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTyp eNode.java:173) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNod e.java:133) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.Cocoon.process(Cocoon.java:656) at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1112) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve. java:171) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :174) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:392) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:619) at java.lang.Thread.run(Thread.java:536) Caused by: java.lang.NullPointerException at org.apache.cocoon.portal.event.impl.DefaultEventManager.processEvents(Defaul tEventManager.java:293) at org.apache.cocoon.portal.impl.PortalManagerImpl.process(PortalManagerImpl.ja va:86) at org.apache.cocoon.portal.impl.PortletPortalManager.process(PortletPortalMana ger.java:228) at org.apache.cocoon.portal.generation.PortalGenerator.generate(PortalGenerator .java:94) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLP ipeline(AbstractProcessingPipeline.java:581) ... 54 more java.lang.NullPointerException at org.apache.cocoon.portal.event.impl.DefaultEventManager.processEvents(Defaul tEventManager.java:293) at org.apache.cocoon.portal.impl.PortalManagerImpl.process(PortalManagerImpl.ja va:86) at org.apache.cocoon.portal.impl.PortletPortalManager.process(PortletPortalMana ger.java:228) at org.apache.cocoon.portal.generation.PortalGenerator.generate(PortalGenerator .java:94) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.processXMLP ipeline(AbstractProcessingPipeline.java:581) at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline .processXMLPipeline(AbstractCachingProcessingPipeline.java:196) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process(Abs tractProcessingPipeline.java:525) at org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(Seri alizeNode.java:155) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTyp eNode.java:173) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNod e.java:133) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:84) at org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invok e(PreparableMatchNode.java:165) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(Pipel ineNode.java:162) at org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invo keNodes(AbstractParentProcessingNode.java:107) at org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(Pipe linesNode.java:136) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:371) at org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcess or.java:312) at org.apache.cocoon.Cocoon.process(Cocoon.java:656) at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1112) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve. java:171) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172 ) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :174) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok eNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:392) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:619) at java.lang.Thread.run(Thread.java:536) If you need help and this information is not enough, you are invited to read the Cocoon FAQ. If you still don't find the answers you need, can send a mail to the Cocoon mailing lists, remembering to: specify the version of Cocoon you're using, or we'll assume that you are talking about the latest released version; specify the platform-operating system-version-servlet container version; send any pertinent error message; send pertinent log snippets; send pertinent sitemap snippets; send pertinent parts of the page that give you problems. For more detailed technical information, take a look at the log files in the log directory of Cocoon, which is placed by default in the WEB-INF/logs/ folder of your cocoon webapp context. If the logs don't give you enough information, you might want to increase the log level by changing the Logging configuration which is by default the WEB-INF/logkit.xconf file. If you think you found a bug, please report it to Apache's Bugzilla; a message will automatically be sent to the developer mailing list and you'll be kept in contact automatically with the further progress on that bug. Thanks, and sorry for the trouble if this is our fault. THanks, Anna.