docs: final JsMsgMap getJmsUserPropertyMap() {
          if (jmsUserPropertyMap == null) {
              List<String> keys = (List<String>) getApi().getField(JsApiAccess.JMSPROPERTY_NAME);
              List<Object> values = (List<Object>) getApi().getField(JsApiAccess.JMSPROPERTY_VALUE);
              jmsUserPropertyMap = new JsMsgMap(keys, values);
          }
          return jmsUserPropertyMap;
      }