Code:
protected Map referenceData(HttpServletRequest request) throws Exception {
           final Map out = new HashMap();
           out.putAll(elab.getInstrumentsUse());
           out.putAll(elab.getConcern());
           out.putAll(elab.getMenuSecondLevel(request.getQueryString()));
           out.put("test","prova");
           
           final Map referenceData = new HashMap();
           referenceData.put("out", out);

           return referenceData;
}