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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)