FULL PRODUCT VERSION :
1.8.0_65

A DESCRIPTION OF THE PROBLEM :
When updating a StackedBarChart by removing series and adding new ones, all the memory is not correctly freed. The VisualVM shows a growing number of StackPane instances.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
launch the given test application


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedBarChart;
import javafx.scene.chart.XYChart.*;
import javafx.stage.Stage;
import javafx.util.Duration;

public class ChartUpdate extends Application {
    private int clock;
    public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(Stage stage) {
        CategoryAxis xAxis = new CategoryAxis();
        NumberAxis yAxis = new NumberAxis(0, 100, 10);
        yAxis.setAutoRanging(false);
        StackedBarChart<String, Number> graph = new StackedBarChart<>(xAxis, yAxis);
        graph.setAnimated(false);
        Series<String, Number> series = new Series<>();
        graph.getData().add(series);
        stage.setScene(new Scene(graph));
        stage.show();

        Timeline timeLine = new Timeline();
        timeLine.getKeyFrames().add(
                new KeyFrame(Duration.millis(200),
                        (e) -> {
                            ObservableList<Data<String, Number>> list = FXCollections.observableArrayList();
                            Series<String, Number> newSeries = new Series<>();
                            list.add(new Data<>("A", clock % 10));
                            list.add(new Data<>("B",(10 - clock )% 10));
                           
                            newSeries.setData(list);
                            graph.getData().clear();
                            graph.getData().add(newSeries);
                            clock = (clock + 1) % 10;
                        }));
        timeLine.setCycleCount(Animation.INDEFINITE);
        timeLine.play();
    }

}
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