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java.lang.NullPointerException: 	at oracle.spatial.router.engine.Route.forwardDFS(Route.java:978)	at oracle.spatial.router.engine.Route.idsOfNodesForwardReachableFromANode(Route.java:999)	at oracle.spatial.router.engine.Route.sourceToHighwaySearch(Route.java:1074)	at oracle.spatial.router.engine.Route.hierarchicalSearch(Route.java:868)	at oracle.spatial.router.engine.Route.computeRoute(Route.java:285)	at oracle.spatial.router.server.RouteServerImplementation.route(RouteServerImplementation.java:202)	at oracle.spatial.router.server.RouteServerServlet.processRouteRequest(RouteServerServlet.java:541)	at oracle.spatial.router.server.RouteServerServlet.takeXMLRequestAndReturnResponse(RouteServerServlet.java:411)	at oracle.spatial.router.server.RouteServerServlet.doPost(RouteServerServlet.java:272)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:810)	at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322)	at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790)	at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:208)	at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:125)	at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)	at java.lang.Thread.run(Thread.java:534)