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Jfreechart: Can SymbolAxis work with TimeSeriesChart?

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Currently I am using JfreeChart to create dynamic charts. Now am facing problem with XY chart. I want show some fixed string label names on Y axis and same time X axis have to fix with dynamic Date time values. How would I customize the X axis and Y axis. Here I have tried using TimeSeriesChart. Sample code here

  TimeSeries s1 = new TimeSeries("Encounter Summary");
   s1.add(new Year(2001), 181.8);
   s1.add(new Year(2002), 167.3);
   TimeSeriesCollection timeset = new TimeSeriesCollection();
   JFreeChart chart = ChartFactory.createTimeSeriesChart("Encounter Summary","Words",  "Activation", timeset, true,true,false);
   XYPlot plot = (XYPlot) chart.getPlot();
   String[] months =  new String[2];
   months[0] = "Jan";
   months[1] = "Feb";
   SymbolAxis rangeAxis = new SymbolAxis("Activation", months);
   rangeAxis.setTickUnit(new NumberTickUnit(1));

When I tried above code i am able to see chart but not showing data line points in chart, When I commented SymbolAxis part its showing data points. I am suspecting SymbolAxis is not working with TimeSeries. When i used createXYLineChart instead of createTimeSeriesChart then succesfully showing data axis points in chart. Please help me to solve this problem.

Actually my requirement is Y axis fixed with month names Jan,Feb,Mar,Apr..Dec and same time X axis have to show dynamic data time values.

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