IDataMapAccessor dataMapAccessor = engine.getDataMapAccessor( facesContext, "clientData", false); if (dataMapAccessor == null) { return Collections.EMPTY_MAP; }
    public final Map getClientDataMap(FacesContext facesContext) {        IDataMapAccessor dataMapAccessor = engine.getDataMapAccessor(                facesContext, "clientData", false);        if (dataMapAccessor == null) {            return Collections.EMPTY_MAP;        }        return dataMapAccessor.getDataMap(facesContext);    }