How use Apache POI for generating report in JIRA Plugin?

[Znaevm]

I try generate excel view in my report plugin by next code:

HttpServletResponse response = ActionContext.getResponse();
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
out.close();
response.addHeader("content-disposition", contentDispositionValue);
return "";

 But when i try get excel view browser send me network error.

What a right way to use Apache poi for generating excel view?

[NightEagle]

I faced same problem. It was resolved by using 

HSSFWorkbook

instead of  

XSSFWorkbook

For example:

HSSFWorkbook wb = new HSSFWorkbook();

HSSFSheet sheet1 = wb.createSheet("sheet1");

response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);

workBook.write(response.getOutputStream());
workBook.close();