[JFreeChart] Pb avec StackedXYAreaRenderer

Pourquoi ce code marche :

Code:

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static private void setXYAreaRender(JFreeChart chart, int index) {
 
	XYAreaRenderer renderer = new XYAreaRenderer();
	XYPlot plot=(XYPlot) chart.getPlot();
	plot.setRenderer(index,renderer);
 
}

alors que celui-là :

Code:

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static private void setStackedXYAreaRender(JFreeChart chart, int index) {
 
	StackedXYAreaRenderer renderer = new StackedXYAreaRenderer();
	XYPlot plot=(XYPlot) chart.getPlot();
	plot.setRenderer(index,renderer);
 
}

provoque l'exception suivante ?

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: org.jfree.data.time.TimeSeriesCollection
	at org.jfree.chart.renderer.xy.StackedXYAreaRenderer.findRangeBounds(StackedXYAreaRenderer.java:361)
	at org.jfree.chart.plot.XYPlot.getDataRange(XYPlot.java:3904)
	at org.jfree.chart.axis.NumberAxis.autoAdjustRange(NumberAxis.java:426)
	at org.jfree.chart.axis.NumberAxis.configure(NumberAxis.java:409)
	at org.jfree.chart.plot.XYPlot.configureRangeAxes(XYPlot.java:1157)
	at org.jfree.chart.plot.XYPlot.setRenderer(XYPlot.java:1447)
	at org.jfree.chart.plot.XYPlot.setRenderer(XYPlot.java:1422)