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

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This exception has no message.
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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)

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