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Null Pointer Exception while creating the Flash Chart


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I wrote the following java code for generating the flash chart:

     ChartServer ch = new ChartServer();
   ch.openData(COD.VALUES, 1, 100);
   for (int i=0;i<99;i++)
     ch.setValue(0, i, java.lang.Math.random()* 80);
   FlashWriter w = new FlashWriter();

   Axis axis = ch.getAxisY();
   axis.setMinorStep((short) 5);
   axis.getMinorGrid().setColor(new java.awt.Color(255, 0, 0));

   ch.setInsideColor(new java.awt.Color(192, 192, 192));
   axis.getGrid().setColor(new java.awt.Color(0, 0, 0));
   axis.setAlternateColor(new java.awt.Color(255, 255, 255));


I am getting an exception while generating Flash Chart using ChartFx6.5 for java,      
17:52:40,956 ERROR [[knchart]] Servlet.service() for servlet knchart threw exception
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.yZYw(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.WZYw(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.zZYw(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.V$ww(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.wZYw(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.Vxww(Unknown Source)
 at SoftwareFX.internal.ChartFX.Internet.Server.Chart.yxww(Unknown Source)
 at SoftwareFX.ChartFX.Chart.getHtmlTag(Unknown Source)
 at SoftwareFX.ChartFX.ChartServer.getHtmlTag(Unknown Source)  

I wrote the above java code by looking into the flash.jsp example given in Chartfx samples folder.But while using that in Java code i am getting this exception.Could you please explain me the behavior of getHtmlTag function.

Can we use getHtmlDataEx function for generating the Flash Chart?


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