Re: jCharts in Struts

On Thursday 04 November 2004 02:25 pm, Victor Nammour wrote:
> Hi,
> Thank you for your outstanding software.
> I am using struts in a web application. As you are familiar, struts uses
> a single action servlet which the developer views as a black box.
> My question: When I encode my chart in an action class, and then forward
> to a jsp to display that chart, I see the chart but when I print the
> stacktrace I get the message:
> java.lang.IllegalStateException: Cannot forward after response has been
> committed
>
> I encode by saying.
> JPEGEncoder13.encode( axisChart, 1.0f, response.getOutputStream());
> in my action class.
> Is there a way to use another output stream and then display this output
> stream in a jsp page? Or do I have to extend the action servlet?
>
> Thank you .
>
> Victor Nammour
> Software Developer
> Office of Information Technology
> Trenton, NJ
>
It is never a good idea to try to output binary data from a JSP page. They 
were not intended for that. If you are trying to output just a chart image, 
and no html, maybe you need a different struts view (not sure how that is 
done, not a struts person). If you want to display the image of a graph on a 
jsp page, you should probably save the image to a file location, and then 
display the graph as an image normally would be done in html.

Chris


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