java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at oracle.spatial.router.engine.Route.forwardDFS(Route.java:1169)
at oracle.spatial.router.engine.Route.idsOfNodesForwardReachableFromANode(Route.java:1190)
at oracle.spatial.router.engine.Route.sourceToHighwaySearch(Route.java:1267)
at oracle.spatial.router.engine.Route.hierarchicalSearch(Route.java:1046)
at oracle.spatial.router.engine.Route.computeRoute(Route.java:289)
at oracle.spatial.router.server.RouteServerImplementation.route(RouteServerImplementation.java:241)
at oracle.spatial.router.server.RouteServerServlet.processRouteRequest(RouteServerServlet.java:689)
at oracle.spatial.router.server.RouteServerServlet.takeXMLRequestAndReturnResponse(RouteServerServlet.java:559)
at oracle.spatial.router.server.RouteServerServlet.doPost(RouteServerServlet.java:419)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:709)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
at com.evermind.server.http.HttpRequestHandler.doDispatchRequest(HttpRequestHandler.java:889)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:797)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:607)
at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:376)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:161)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:142)
at oracle.oc4j.network.ServerSocketReadHandler$ClientRunnable.run(ServerSocketReadHandler.java:275)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)

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