Not getting graph in JFreeChart

Question

This is my code.

public static Component create_Chart(double[] xValues2, double[] yValues2) throws IOException
   {
       JInternalFrame iFrame = new JInternalFrame(
             WordsInArray.fc.getSelectedFile().toString(),true,true,true,true);
         iFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
         iFrame.setSize(600, 200);

         double[] xVal=new double[xValues.length];

         for(int i=0;i<=xValues.length-1;i+=2)
         {
             xVal[i]=xValues[i];
             System.out.println(xVal[i]);
         }
         double[] yVal=XYValues.get_yValues();
        for(int i=1;i<=yValues.length;i+=2)
        {
            //i++;
             System.out.println(yVal[i]);
        }

       try{
         XYSeries series=new XYSeries("Sample");
         //series.add(xVal,yVal);      
         for(int i=0;i<=xValues.length-1;i++)
         {
           series.add(xVal[i],yVal[i]);   
          }

        XYDataset xyDataset = new XYSeriesCollection(series);

        JFreeChart chart = ChartFactory.createXYLineChart
                ("","Wave number", "Intensity",
                 xyDataset, PlotOrientation.VERTICAL, false, true, false);

         chart.getPlot().setBackgroundPaint( Color.WHITE);
         JPanel chartPanel = new ChartPanel(chart);

         iFrame.add(chartPanel);
         iFrame.pack();
         iFrame.setVisible(true);
   }
       catch(Exception e)
       {
           e.printStackTrace();
       }
       return iFrame;
   }

I am not able to get the graph in the JInternalFrame. Did I missed anything in adding the values for the chart? Please let me know how to add array values to add().