Urgent! Strange problem when calling jasper report in STRUTS

[Michael Zohner]

Urgent! Strange problem when calling jasper report from STRUTS
Hi,

I have a problem when calling a jasper report from Struts and I have no idea what I am doing wrong.

I get a "java.lang.IllegalStateException: Cannot forward after response has been committed" exception!

My code is below...
Action:

public ActionForward execute(final ActionMapping mapping, final ActionForm form, final HttpServletRequest request, final HttpServletResponse response) throws IOException, ServletException {
...
if (irForm.isExcelReport()){
return mapping.findForward(AbstractBaseReportBean.prepare ReportJrxml(getRatesAndMissingCurrencies(), JASPER_FILE, "EXCEL", request, response));
}

// I pass a list with one map to this "prepareReportJrxml" method

AbstractBaseReportBean:

public static String prepareReportJrxml(List reportData, final String compileFileName, final String _exportOption, final HttpServletRequest request, final HttpServletResponse response) throws JRException, IOException, ReportingException {

HttpSession session = request.getSession();
ServletContext context = session.getServletContext();

ReportConfigUtil.compileReport(context, getCompileDir(), compileFileName);
File reportFile = new File(ReportConfigUtil.getJasperFilePath(context, getCompileDir(), compileFileName + ".jasper"));
JasperPrint jasperPrint = ReportConfigUtil.fillReport(reportFile, getReportParameters(), getJRBeanCollectionDataSource(reportData));

ExportOption option = ExportOption.valueOf(_exportOption);
if(option == null){
option = getExportOption();
}

if (option.equals(ExportOption.HTML)) {
exportReportHtml(jasperPrint, response);
} else if (option.equals(ExportOption.EXCEL)){
exportReportPlainXls(jasperPrint, response);
} else if (option.equals(ExportOption.PDF)){
exportReportPdf(jasperPrint, request, response);
}
//FacesContext.getCurrentInstance().responseComplete ();
return LimexGuiConstants.FWD_SUCCESS;
}

exportReportPlainXls method:

protected static void exportReportPlainXls(JasperPrint jp, HttpServletResponse response) throws JRException, IOException {
ByteArrayOutputStream xlsReport = new ByteArrayOutputStream();
JRAbstractExporter jasperXlsExportMgr = new JRXlsExporter();
jasperXlsExportMgr.setParameter(JRXlsExporterParam eter.JASPER_PRINT, jp);
jasperXlsExportMgr.setParameter(JRXlsExporterParam eter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
jasperXlsExportMgr.setParameter(JRXlsExporterParam eter.IS_WHITE_PAGE_BACKGROUND, java.lang.Boolean.FALSE);
jasperXlsExportMgr.setParameter(JRXlsExporterParam eter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);
jasperXlsExportMgr.setParameter(JRXlsExporterParam eter.IS_DETECT_CELL_TYPE, Boolean.TRUE);
jasperXlsExportMgr.setParameter(JRExporterParamete r.OUTPUT_STREAM, xlsReport);
jasperXlsExportMgr.exportReport();
byte[] bytes = null;
bytes = xlsReport.toByteArray();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control", "max-age=1000");
response.setHeader("content-Disposition", "attachment;filename="report.xls";");
response.setContentLength(bytes.length);
ServletOutputStream outputStream = response.getOutputStream();
InputStream is = new ByteArrayInputStream(bytes);
int iSize = 0;
byte[] oBuff = new byte[1024];
while ((iSize = is.read(oBuff)) != -1) {
outputStream.write(oBuff, 0, iSize);
}
outputStream.flush();
//outputStream.close();
}

at this point I get the error:
AbstractBaseReportBean:

//FacesContext.getCurrentInstance().responseComplete ();
return LimexGuiConstants.FWD_SUCCESS;

I dont know how to eliminate this error.
I think, this is also the reason why no data will be passed to the excel sheet (I think).

Thanks a lot ! cheers

[David Newton]

http://faq.javaranch.com/java/EaseUp

Actions that write their own response should return "null" (not an ActionForward) so the framework doesn't attempt to continue processing the request.