DefaultCategoryDataset dataset =  new  DefaultCategoryDataset();
dataset.addValue( 300 , "A", "apple");
dataset.addValue( 200 , "B", "banana");
dataset.addValue( 500 , "C", "grape");
dataset.addValue( 340 , "D", "mango");
dataset.addValue( 280 , "E", "lichee");
dataset.addValue( 280 , "F", "wwwwww");
    System.out.print("\n"+"-1");
    JFreeChart chart = ChartFactory.createAreaChart("Bar Chart Demo", "Category", "Value", dataset, PlotOrientation.VERTICAL, true, true, false);
    CategoryPlot categoryplot = chart.getCategoryPlot();
    chart.setBackgroundPaint(Color.white);
        System.out.print("\n"+"1");
    categoryplot.setBackgroundPaint(Color.lightGray);
    categoryplot.setDomainGridlinePaint(Color.white);
    categoryplot.setDomainGridlinesVisible(true);
    categoryplot.setRangeGridlinePaint(Color.white);
    NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
    numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
/*
    BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer();
    barrenderer.setDrawBarOutline(false);

    GradientPaint gradientpaint = new GradientPaint(0.0F, 0.0F, Color.blue, 0.0F, 0.0F, Color.blue);
    GradientPaint gradientpaint1 = new GradientPaint(0.0F, 0.0F, Color.green, 0.0F, 0.0F, new Color(0, 64, 0));

    barrenderer.setSeriesPaint(0, gradientpaint);
    barrenderer.setSeriesPaint(1, gradientpaint1);
*/
    FileOutputStream fos =  new  FileOutputStream("c:\\123.png");
    System.out.print("\n"+"7");
    ChartUtilities.writeChartAsPNG(fos, chart,  600 ,  300 );

java.lang.ClassCastException
	at org.apache.jsp.chart1$jsp._jspService(chart1$jsp.java:127)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)