getOutputStream() has already been called

[Altner, Bruce (HQ-LD070)[InDyne, Inc]]

 

Greetings:

 

I am creating an Excel spreadsheet from with a servlet and this works
fine when I call the servlet directly. But when I run the application
through a reverse proxy the spreadsheet comes up empty. The code snippet
looks like this:

 

        response.setContentType("application/vnd.ms-excel");

        response.addHeader("Content-Disposition",
"attachment;filename=calendar.xls");

        OutputStream out = response.getOutputStream();

            

        //Create a new workbook

            HSSFWorkbook wb = new HSSFWorkbook();

            HSSFSheet s = wb.createSheet(); 

      

            (all sorts of data gets added here)

 

            wb.write(out);

            out.close();

 

Checking the logs I see that the problem is an IllegalStateException:
...getOutputStream() has already been called.

Something in the reverse proxy must be getting the OutputStream and
holding onto it. Has anyone run into this before?

 

Thanks,

Bruce