JavaFx adding a text label on top of StackedBarChart

DynamicallyColoredBarChartWithLabel

import javafx.application.Application;
import javafx.beans.value.*;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Bounds;
import javafx.geometry.Pos;
import javafx.scene.*;
import javafx.scene.chart.*;
import javafx.scene.control.Label;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.shape.*;
import javafx.scene.text.Text;
import javafx.stage.Stage;

/**
 * Displays a Stackedbar with a multi series whose bars are different colors depending
 * upon the bar value. A custom legend is created and displayed for the bar
 * data. Bars in the chart are customized to include a text label of the bar's
 * data value above the bar.
 */

public class DynamicallyColoredBarChartWithLabel extends Application {

    @Override
    public void start(Stage stage) {
        final NumberAxis yAxis = new NumberAxis();
        yAxis.setLabel("Value");
        String[] years = {"2007", "2008", "2009"};
        final CategoryAxis xAxis = new CategoryAxis(FXCollections.<String>observableArrayList(years));
        xAxis.setLabel("Bars");
//        final StackedBarChart<String, Number> bc = new StackedBarChart<>(xAxis, yAxis);
//        bc.setLegendVisible(false);
//
//        XYChart.Series<String,Number> series1 = new XYChart.Series();
//        XYChart.Series<String,Number> series2 = new XYChart.Series();

//        for (int i = 1; i <= 10; i++) {
//            final XYChart.Data<String, Number> data = new XYChart.Data("Value " + i, i);
////            data.nodeProperty().addListener(new ChangeListener<Node>() {
////                @Override
////                public void changed(ObservableValue<? extends Node> ov, Node oldNode, final Node node) {
////                    if (node != null) {
////                        setNodeStyle(data);
////                        displayLabelForData(data);
////                    }
////                }
////            });
//            series1.getData().add(data);
//        }
        ObservableList<StackedBarChart.Series> barChartData = FXCollections.observableArrayList(
                new StackedBarChart.Series("Region 1", FXCollections.observableArrayList(
                new StackedBarChart.Data(years[0], 567d),
                new StackedBarChart.Data(years[1], 1292d),
                new StackedBarChart.Data(years[2], 1292d))),
                new StackedBarChart.Series("Region 2", FXCollections.observableArrayList(
                new StackedBarChart.Data(years[0], 956),
                new StackedBarChart.Data(years[1], 1665),
                new StackedBarChart.Data(years[2], 2559))),
                new StackedBarChart.Series("Region 3", FXCollections.observableArrayList(
                new StackedBarChart.Data(years[0], 1154),
                new StackedBarChart.Data(years[1], 1927),
                new StackedBarChart.Data(years[2], 2774))));

        final XYChart.Series<String, Number> lastSeries = barChartData.get(barChartData.size() - 1);
        for (final XYChart.Data<String, Number> data : lastSeries.getData()) {
            data.nodeProperty().addListener(new ChangeListener<Node>() {
                @Override
                public void changed(ObservableValue<? extends Node> ov, Node oldNode, final Node node) {
                    if (node != null) {
//                        setNodeStyle(data);
                        displayLabelForData(data);
                    }
                }
            });
        }

        StackedBarChart<String, Number> chart = new StackedBarChart(xAxis, yAxis, barChartData, 25.0d);
        LevelLegend legend = new LevelLegend();
        legend.setAlignment(Pos.CENTER);

        VBox chartWithLegend = new VBox();
        chartWithLegend.getChildren().setAll(chart, legend);
        VBox.setVgrow(chart, Priority.ALWAYS);

        chartWithLegend.getStylesheets().add(getClass().getResource("colored-chart.css").toExternalForm());

        stage.setScene(new Scene(chartWithLegend));
        stage.setMinHeight(400);
        stage.setMinWidth(400);
        stage.show();
    }

    /**
     * Change color of bar if value of i is <5 then red, if >5 then green if i>8
     * then blue
     */
    private void setNodeStyle(XYChart.Data<String, Number> data) {
        Node node = data.getNode();
        if (data.getYValue().intValue() > 8) {
            node.setStyle("-fx-bar-fill: -fx-exceeded;");
        } else if (data.getYValue().intValue() > 5) {
            node.setStyle("-fx-bar-fill: -fx-achieved;");
        } else {
            node.setStyle("-fx-bar-fill: -fx-not-achieved;");
        }
    }

    /**
     * places a text label with a bar's value above a bar node for a given
     * XYChart.Data
     */
    private void displayLabelForData(XYChart.Data<String, Number> data) {
        final Node node = data.getNode();
        final Text dataText = new Text(data.getYValue() + "");
        node.parentProperty().addListener(new ChangeListener<Parent>() {
            @Override
            public void changed(ObservableValue<? extends Parent> ov, Parent oldParent, Parent parent) {
                Group parentGroup = (Group) parent;
                parentGroup.getChildren().add(dataText);
            }
        });

        node.boundsInParentProperty().addListener(new ChangeListener<Bounds>() {
            @Override
            public void changed(ObservableValue<? extends Bounds> ov, Bounds oldBounds, Bounds bounds) {
                dataText.setLayoutX(
                        Math.round(
                        bounds.getMinX() + bounds.getWidth() / 2 - dataText.prefWidth(-1) / 2));
                dataText.setLayoutY(
                        Math.round(
                        bounds.getMinY() - dataText.prefHeight(-1) * 0.5));
            }
        });
    }

    /**
     * A simple custom legend for a three valued chart.
     */
    class LevelLegend extends GridPane {

        LevelLegend() {
            setHgap(10);
            setVgap(10);
            addRow(0, createSymbol("-fx-exceeded"), new Label("Exceeded"));
            addRow(1, createSymbol("-fx-achieved"), new Label("Achieved"));
            addRow(2, createSymbol("-fx-not-achieved"), new Label("Not Achieved"));

            getStyleClass().add("level-legend");
        }

        /**
         * Create a custom symbol for a custom chart legend with the given
         * fillStyle style string.
         */
        private Node createSymbol(String fillStyle) {
            Shape symbol = new Ellipse(10, 5, 10, 5);
            symbol.setStyle("-fx-fill: " + fillStyle);
            symbol.setStroke(Color.BLACK);
            symbol.setStrokeWidth(2);

            return symbol;
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

But did you try updating data ? Labels on top of bar chart stay after updating data for me... It's annoying and I don't know how to remove them.
http://stackoverflow.com/questions/34286062/how-to-clear-text-added-in-a-javafx-barchart