What should be passed in ExportControl.processHttpRequest()

Hi,

We have a webapplication and we are using JRC from CR4E to serve Report in PDF format in the response. I am using ReportControl.processHttpRequest() API to serve the response.

The question is:

In ReportExportControl.processhttpRequest(HttpServletRequest request, HttpServletResponse response, ServletContext context, java.io.Writer out), what should be passed as "out"?

If I pass null, and if multiple users try to access the report, i.e. multiple threads call this API, I get java.lang.IllegalThreadStateException intermittently.

On the other hand, if I pass response.getWriter() and also set the contentType and character encoding of the response, I do not get this exception when multiple users are accessing the report. Following is the code snippet for this.

response.setContentType("application/pdf");

response.setCharacterEncoding("UTF-8");

IReportSource reportSource = reportClientDocument.getReportSource();

ReportExportControl exportControl = new ReportExportControl();

ExportOptions exportOptions = new ExportOptions();

PDFExportFormatOptions pdfexpopts = new PDFExportFormatOptions();

exportOptions.setExportFormatType(ReportExportFormat.PDF);

exportOptions.setFormatOptions(pdfexpopts);

exportControl.setReportSource(reportSource);

exportControl.setExportOptions(exportOptions);

exportControl.processHttpRequest(request, response, getServletContext(), response.getWriter());

exportControl.dispose();

Can any body please explain the purpose of the (java.io.Writer out) parameter in the processHttpRequest API, and what happens internally in the API when null is passed.

Thank you,

Deepak