@RequestMapping("/ajaxChartGantt.html") public String ajaxGantt( @RequestParam("sym") String param, @RequestParam("name") String name, ModelMap model, HttpServletRequest request, HttpSession session, HttpServletResponse response) throws Exception { log.debug("ChartController "); List<Document> list = (List<Document>) session.getAttribute("resultsSingle"); OutputStream stream = response.getOutputStream(); response.setContentType("image/jpeg"); ChartUtilities.writeChartAsJPEG( stream, ChartUtils.createGanttChart("Gantt", "Fechas", "Tarea", list), 900, 600); stream.close(); return null; }