fix where expression

Author: tschie

src/main/java/com/esri/samples/displayinformation/show_labels_on_layer/ShowLabelsOnLayerSample.java

@@ -90,7 +90,7 @@ public void start(Stage stage) throws Exception {
       // position the label above and along the direction of the road
       json.add("labelPlacement", new JsonPrimitive("esriServerLinePlacementAboveAlong"));
       // only show labels on the interstate highways (others have an empty rte_num1 attribute)
-      json.add("where", new JsonPrimitive("$feature.rte_num1 <> ' '"));
+      json.add("where", new JsonPrimitive("rte_num1 <> ' '"));
       // set the text symbol as the label symbol
       json.add("symbol", new JsonParser().parse(textSymbol.toJson()));