Column color in bar chart

private class Engine extends JFreeChartEngine
  {
    public boolean prepareJFreeChart(JFreeChart jfchart, Chart chart)
    {
      CategoryPlot plot = (CategoryPlot) jfchart.getPlot();

      BarRenderer3D renderer = (BarRenderer3D) plot.getRenderer();

      Color[] colors = App.getDefaultChartColors();

      renderer.setSeriesPaint(0, colors[0]);
      
      return false;
    }
  }