eUpdate extends Application {     private int clock;      public class Item {         private IntegerProperty x = new SimpleIntegerProperty(0);          public final IntegerProperty xProperty() {             return this.x;         }          public final int getX() {             return this.xProperty().get();         }          public final void setX(final int x) {             this.xProperty().set(x);         }     }      @Override     public void start(Stage primaryStage) throws Exception {          ObservableList<Item> viewModel = FXCollections.observableArrayList();         TableView<