jfreechar tooltip not able to show

[Member 2321293]

I am generating barchart using jFreeChart and i need to make a customize content tooltip for the bar and here is my customized function on StandardCategoryToolTipGenerator and the problem right now is.. when mouse point to the bar the tooltip does not show

class MyTooltipGenerator extends StandardCategoryToolTipGenerator
{

	@Override
	public String generateToolTip(CategoryDataset dataset, int series, int category)
	{
		
		return "generateToolTip";
	}

	@Override
	public String generateLabelString(CategoryDataset dataset, int row, int col)
	{
		return dataset.getColumnKey(col) + " " + dataset.getValue(row, col);
	}

};

Both StandardCategoryToolTipGenerator and BarRender are customized as below:

MyTooltipGenerator std = new MyTooltipGenerator();
BarRenderer renderer = new MyBarRenderer();

when generating the content of the tooltip i make is as below:

        BarRenderer rr = (BarRenderer) plot.getRenderer();
		std.**generateLabelString**(dataset, row, column);
		std.**generateToolTip**(dataset, row, column);
		rr.setBaseToolTipGenerator(std);
		plot.setRenderer(rr);

Problem now is the tooltip are NOT able to show.. is the tooltip required certain FORMAT? cause my plan is make the tooltip to be look like: Quaitity: 50 Percetage: 80% when the mouse point to the bar and it cannot display like above

[Lost User]

Try the support forum at JFreeChart[^].