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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:998)	at java.lang.String.compareTo(String.java:90)	at oracle.mapviewer.share.Field.compareTo(Field.java:704)	at oracle.mapviewer.share.stylex.CollectionBucket.contains(CollectionBucket.java:128)	at oracle.mapviewer.share.stylex.BucketSeries.getBucket(BucketSeries.java:205)	at oracle.sdovis.stylex.BucketStyle.pickBucket(BucketStyle.java:618)	at oracle.sdovis.stylex.BucketStyle.chooseStyle(BucketStyle.java:536)	at oracle.sdovis.stylex.BucketStyle.apply(BucketStyle.java:945)	at oracle.sdovis.VectorRenderer.renderStyledFeature(VectorRenderer.java:408)	at oracle.sdovis.VectorRenderer.render(VectorRenderer.java:239)	at oracle.sdovis.RenderingEngine.render(RenderingEngine.java:402)	at oracle.sdovis.DBMapMaker.renderEm(DBMapMaker.java:1464)	at oracle.sdovis.MapMaker.renderMap(MapMaker.java:1424)	at oracle.lbs.mapserver.core.RealWorker.generateMapImage(RealWorker.java:565)	at oracle.lbs.mapserver.core.RealWorker.process(RealWorker.java:283)	at oracle.lbs.mapserver.MapServerImpl.renderMap(MapServerImpl.java:190)	at oracle.lbs.mapcache.cache.TileFetcher.fetchInternalMap(TileFetcher.java:259)	at oracle.lbs.mapcache.cache.TileFetcher.fetchTile(TileFetcher.java:171)	at oracle.lbs.mapcache.cache.Tile.fetchTile(Tile.java:263)	at oracle.lbs.mapcache.cache.Tile.fetchTile(Tile.java:239)	at oracle.lbs.mapcache.cache.MapCache.getTile(MapCache.java:148)	at oracle.lbs.mapcache.MapCacheServer.getMapImageStream(MapCacheServer.java:138)	at oracle.lbs.mapcache.MCSServlet.doPost(MCSServlet.java:224)	at oracle.lbs.mapcache.MCSServlet.doGet(MCSServlet.java:189)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)	at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:719)	at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:376)	at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870)	at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451)	at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:218)	at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:119)	at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)	at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)	at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)	at java.lang.Thread.run(Thread.java:595)