javafx8 candle stick chart can't getrid of the stale data - javafx-8

Question

I used the sample candle stick chart code to draw chart. When I worked in the java7 ,the chart worked fine. But when I tried in the Java8. there is a problem.
I tracked the problem like this:this code is from the sample code of Ensemble ：CandlStickChart.java
#Override protected void layoutPlotChildren() {
// we have nothing to layout if no data is present
if(getData() == null) return;
// update candle positions
for (int seriesIndex=0; seriesIndex < getData().size(); seriesIndex++) {
Series<Number,Number> series = getData().get(seriesIndex);
Iterator<Data<Number,Number>> iter = getDisplayedDataIterator(series);
Path seriesPath = null;
if (series.getNode() instanceof Path) {
seriesPath = (Path)series.getNode();
seriesPath.getElements().clear();
}
while(iter.hasNext()) {
System.out.println(i++); // the different place
Data<Number,Number> item = iter.next();
double x = getXAxis().getDisplayPosition(getCurrentDisplayedXValue(item));
double y = getYAxis().getDisplayPosition(getCurrentDisplayedYValue(item));
Node itemNode = item.getNode();
CandleStickExtraValues extra = (CandleStickExtraValues)item.getExtraValue();
if (itemNode instanceof Candle && extra != null) {
Candle candle = (Candle) itemNode;
this is part of the code.the problem is with the "the different palce"
for the iter.hasNext() will preserve the stale value.so, every time I set in new data。the list is further long .
the setdata code like ：
ObservableList<XYChart.Data<Number, Number>> newData
= FXCollections.<XYChart.Data<Number, Number>>observableArrayList();
for (int j = 1; j <= leno; j++) {
newData.add(。。。。。。。);//
series.getData().clear();
series.setData(newData);
When I remove the stale data by Iter.remove the exception is:we don't support removeing items from the diplayed data list.

Answer 1

You have to add two calls to removeDataItemFromDisplay to the dataItemRemoved method.
Note: I made series and item final in the example code.
#Override
protected void dataItemRemoved(final Data<Number, Number> item,
final Series<Number, Number> series) {
final Node candle = item.getNode();
if (shouldAnimate()) {
// fade out old candle
FadeTransition ft = new FadeTransition(Duration.millis(500), candle);
ft.setToValue(0);
ft.setOnFinished(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent actionEvent) {
getPlotChildren().remove(candle);
removeDataItemFromDisplay(series, item);
}
});
ft.play();
} else {
getPlotChildren().remove(candle);
removeDataItemFromDisplay(series, item);
}
}