Hi Jon,
I am no struts expert but I think your problem lies in trying to do a
forward after the writing to servlet output stream (through poi). You should
not try to send a redirect after generating content on a stream.

I don't know why it was working with older version of struts. Have you
changed your action mappings during the upgrade?

May be you can get some ideas from here
http://wiki.apache.org/struts/StrutsFileDownload

Regards,
Tahir Akhtar

> -----Original Message-----
> From: Jon Wynacht [mailto:jon@obje...]
> Sent: Monday, May 28, 2007 2:57 AM
> To: poi-user@jaka...
> Subject: Excel, Struts and Downloading
>
> Hi,
>
> I used to run Struts 1.2.9, POI 2.5 and could generate Excel files
> from a servlet and download them without issue. I recently upgraded
> to Struts 1.3.5 and POI 3 and it looks like I broke that capability.
> I'm getting the following error:
>
> java.lang.IllegalStateException: getOutputStream() has already been
> called for this response
>
> I've searched through the Net and the archives here for info but
> nothing really seems to fit for my situation; it's mostly JSP.
>
> I'm calling an Action servlet which makes a call to the model and
> gets some data, creates a new workbook and then does this:
>
> <snip>
> response.setContentType("application/vnd.ms-excel");
>                  response.setHeader("Content-disposition",
> "attachment;filename=\"attendees.xls\"");
>                  response.addHeader("Content-description", "Event
> Attendees");
>                  ServletOutputStream stream = response.getOutputStream
> ();
>                  wb.write(stream);
>                  stream.close();
> ...
> forward = "SUCCESS";
> ...
> return mapping.findForward(forward);
> </snip>
>
> It's what I did before I upgraded and things worked fine. Now they don't
>
> Any ideas? Am I missing something really obvious or was I bending the
> rules a bit and taking chances with my data in my previous config?
>
> Cheers and thanks,
>
> Jon
>
> Jon Wynacht
> jon@obje...
> http://www.objectevolution.com
>
>
>
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