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May 15, 2007 at 09:24 AM

Top Level Navigation Problem

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Hi guys,

recently, I ran into something really strange. The Top Level Navigation (TLN) became faulty. If the user clicks on certain entries in First Level Navigation or Second Level Navigation the content area is not loaded properly. The content area stays empty as well as the detailed navigation iView (no navigation entries listed). Furthermore, the TLN does not get updated.

The weird thing is it only affects a few users and the set of affected navigation tabs is different for every user. The problem affects standard tabs (System Administration, Content Administration, etc.) as well as custom tabs. The set of affected users and the set of affected tabs seems to be arbitrary chosen.

A new log entry is written every time the problem occurs. Find an example below:

<i>

[PortalNode.fireEventOnNode.toEventListener] event=onNodeReadyEvent, target=com.sap.netweaver.coll.CollaborationDetailedNavigation, operation failed

[EXCEPTION]

java.lang.NullPointerException

at com.sapportals.portal.navigation.CollaborationNavTree.isCollaborationNode(CollaborationNavTree.java:490)

at com.sapportals.portal.navigation.CollaborationNavTree.doOnNodeReady(CollaborationNavTree.java:227)

at com.sapportals.portal.prt.component.AbstractPortalComponent.handleEvent(AbstractPortalComponent.java:388)

at com.sapportals.portal.prt.pom.ComponentNode.handleEvent(ComponentNode.java:252)

at com.sapportals.portal.prt.pom.PortalNode.fireEventOnNode(PortalNode.java:369)

at com.sapportals.portal.prt.pom.AbstractNode.addChildNode(AbstractNode.java:340)

at com.sapportals.portal.pb.PageBuilder.createAndAddEmbeddediView(PageBuilder.java:174)

at com.sapportals.portal.pb.PageBuilder.createiView(PageBuilder.java:387)

at com.sapportals.portal.pb.PageBuilder.createAndAddiViews(PageBuilder.java:230)

at com.sapportals.portal.pb.PageBuilder.doOnNodeReady(PageBuilder.java:572)

at com.sapportals.portal.prt.component.AbstractPortalComponent.handleEvent(AbstractPortalComponent.java:388)

at com.sapportals.portal.pb.PageBuilder.handleEvent(PageBuilder.java:741)

at com.sapportals.portal.prt.component.CachablePortalComponent.handleEvent(CachablePortalComponent.java:703)

at com.sapportals.portal.prt.pom.ComponentNode.handleEvent(ComponentNode.java:252)

at com.sapportals.portal.prt.pom.PortalNode.fireEventOnNode(PortalNode.java:369)

at com.sapportals.portal.prt.pom.AbstractNode.addChildNode(AbstractNode.java:340)

at com.sapportals.portal.prt.core.PortalRequestManager.runRequestCycle(PortalRequestManager.java:642)

at com.sapportals.portal.prt.connection.ServletConnection.handleRequest(ServletConnection.java:240)

at com.sapportals.portal.prt.dispatcher.Dispatcher$doService.run(Dispatcher.java:522)

at java.security.AccessController.doPrivileged(AccessController.java:242)

at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:405)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at com.sap.engine.services.servlets_jsp.server.servlet.InvokerServlet.service(InvokerServlet.java:156)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)

at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)

at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)

at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)

at java.security.AccessController.doPrivileged(AccessController.java:215)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

</i>

While searching SDN I found a SAP Note that might be interesting. SAP Note 982496 contains the description of a similar problem with almost the same error message. However, this SAP Note describes a problem of NW 2004 SPS 17. A problem that should be solved in newer releases. We patched our system last time (NW2004s SPS 09) a few month ago. We never had any similar problems until last week when the above described problems started.

Unfortunately, the problem starts to escalate. More and more users and more and more navigation tabs are affected.

Does anyone of you have any experience with this kind of problems? Please suggest how to troubleshoot and solve this very annoying problem. Of course, I am going to reward helpful answers.

Best regards,

Martin