public StreamedContent getAttachment(){ portletResourceResponse.setContentType("application/pdf"); //application/pdf portletResourceResponse.setProperty("Content-Disposition", "attachment"); try{ portletResourceResponse.flushBuffer(); OutputStream out = portletResourceResponse.getPortletOutputStream(); out.write(------); out.flush(); facesContext.responseComplete(); out.close(); }catch(Exception e) { e.printStackTrace(); } return null; }