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Liferay JSF pdf downloading from stream best practice

    in  the java class


public StreamedContent getPdfFile() throws Exception {
FacesContext facesContext = FacesContext.getCurrentInstance();
   PortletResponse portletResponse= (PortletResponse)facesContext.getExternalContext().getResponse();
   ResourceResponse portletResourceResponse = (ResourceResponse) portletResponse;
   portletResourceResponse.setContentType("application/pdf");
/*the following line is very important */
   portletResourceResponse.flushBuffer();
   OutputStream out = portletResourceResponse.getPortletOutputStream();
   out.write(PdfGenerator.pdfFromHtmlContent(content);
   out.flush();
   facesContext.responseComplete();

return null
}



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in the xhtml page

<p:commandButton value="download PDF" ajax="false">
   <p:fileDownload value="#{ph.pdfFile}" />
</p:commandButton>



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