jfreechart multiple renderers tooltip not working - jfreechart

Question

I have a figure with 2 sets of graphs (detections and localizations). First set (localizations) is red ,orange,pink and second set (detections) is blue,black,cyan. I have created a renderer for each set in order to set the colors. I have set the tooltip to true but when I mouseover on the second set (detection) I can't see the labels. I can see labels only for first set on mouseover(see picture) but not for the other set. Here is my code:
JFreeChart avg_chart = ChartFactory.createTimeSeriesChart(
"Average detections and localizations" ,
"" ,
"" ,
null ,
true , true , false);
avg_chart.setBackgroundPaint(Color.WHITE);
final XYPlot plot = avg_chart.getXYPlot( );
plot.setDataset(0,this.dataset_local);
plot.setDataset(1,this.dataset_detect);
plot.setRangeAxis(0,new NumberAxis("Localizations"));
plot.setRangeAxis(1,new NumberAxis("Detections"));
plot.mapDatasetToRangeAxis(0, 0);
plot.mapDatasetToRangeAxis(1, 1);
plot.setDomainCrosshairVisible(true);
plot.setRangeCrosshairVisible(true);
XYLineAndShapeRenderer renderer1 = (XYLineAndShapeRenderer) plot.getRenderer(0);//localization
renderer1.setSeriesPaint( 0 , Color.RED );
renderer1.setSeriesPaint( 1 , Color.MAGENTA );
renderer1.setSeriesPaint( 2 , Color.orange );
renderer1.setBaseItemLabelsVisible(true);
XYLineAndShapeRenderer renderer2 = new XYLineAndShapeRenderer(true, false); //detection ****************
renderer2.setSeriesPaint( 0 , Color.BLUE);
renderer2.setSeriesPaint( 1 , Color.BLACK );
renderer2.setSeriesPaint( 2 , Color.CYAN );
renderer2.setBaseItemLabelsVisible(true);
plot.setRenderer(0,renderer1);
plot.setRenderer(1,renderer2);
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setDateFormatOverride(new SimpleDateFormat("dd/MM/yyyy"));
return avg_chart;
}
I have tried XYLineAndShapeRenderer renderer2 = (XYLineAndShapeRenderer) plot.getRenderer(1) but it gives be a nulll exception.

Answer 1

ChartFactory.createTimeSeriesChart() adds an XYToolTipGenerator to renderer1 for you when tooltips is true. You probably just need to use it with renderer2:
renderer2.setBaseToolTipGenerator(renderer1.getBaseToolTipGenerator());
Or you can add a new one to renderer2:
XYToolTipGenerator toolTipGenerator2 = StandardXYToolTipGenerator.getTimeSeriesInstance();
renderer2.setBaseToolTipGenerator(toolTipGenerator2);