CategoryAxis categoryAxis = new CategoryAxis(categoryAxisLabel);
DateAxis dateAxis = new DateAxis(dateAxisLabel);
CategoryItemRenderer renderer = new GanttRenderer();
renderer.setDefaultToolTipGenerator(
new IntervalCategoryToolTipGenerator(
"{3} - {4}", DateFormat.getDateInstance()));
CategoryPlot plot = new CategoryPlot(dataset, categoryAxis, dateAxis,
renderer);
plot.setOrientation(PlotOrientation.HORIZONTAL);