In line chart, how to show the values in points ?

Below code will show values as well as add the "%" sign to that value. In this code i have only one series so i have just used getItemCount(0)  and getY(0,i) to get first series. if you have many series just use a loop at the top level.

    public strictfp void customize(JFreeChart chart, JRChart jasperChart)
    {
       XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) chart.getXYPlot().getRenderer();
       renderer.setBaseItemLabelsVisible(Boolean.TRUE);
       renderer.setBaseItemLabelFont(new Font("SansSerif", Font.PLAIN, 12));
       for(int i = 0 ; i <chart.getXYPlot().getDataset().getItemCount(0); i++){
           Number n = chart.getXYPlot().getDataset().getY(0,i);
           renderer.setBaseItemLabelGenerator((XYItemLabelGenerator) new StandardXYItemLabelGenerator(n.toString().concat("%")));
        }
      
    }