code: public static void setProperty(String propertyName, String propertyValue) {
  		try {
  			FreeMarkerRender.getConfiguration().setSetting(propertyName, propertyValue);
  		} catch (TemplateException e) {
  			throw new RuntimeException(e);
  		}
  	}
docs: Set freemarker's property.
  The value of template_update_delay is 5 seconds.
  Example: FreeMarkerRender.setProperty("template_update_delay", "1600");