OutputStream already retrieved?

Question

Hi , all:
Now i use the popup dialog to export excel , after export the data , i use AdfFacesContext.getCurrentInstance().returnFromDialog(null, null); back to the main page.but when the program run this, it will has error as follows:
javax.faces.FacesException: #{excelExporter.doExport}: javax.faces.el.EvaluationException: java.lang.IllegalStateException: OutputStream already retrieved
and when i export excel, i use these code:
try {
OutputStream out = response.getOutputStream();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment; filename=" + filename);
HSSFWorkbook workbook = createWorkbook(iter, attr, attributes, maxrowcount);
workbook.write(out);
out.flush();
out.close();
FacesContext.getCurrentInstance().responseComplete();
} catch (IOException ex) {
ex.printStackTrace();
createWorkbook is the method to generate the excel.
After this i will call the AdfFacesContext.getCurrentInstance().returnFromDialog(null, null); to return and at this time it has error.
How to solve this problem.
Thanks in advance.

Answer 1

Hi,
what I am suggesting is to defer the whole Excel processing to the return listener. The data entered in the dialog can be returned to the return listener in a HashMap (second argument in the closeDialog statement). Then you handle Excel generation etc. in the listener code. My assumption is that you are getting into conflict with the internal dialog processing. From the application's workflow there is no difference between your approach and what I am suggesting
Frank