docs: final JsMsgMap getJmsSystemPropertyMap() {
          if (jmsSystemPropertyMap == null) {
              List<String> keys = (List<String>) getApi().getField(JsApiAccess.SYSTEMPROPERTY_NAME);
              List<Object> values = (List<Object>) getApi().getField(JsApiAccess.SYSTEMPROPERTY_VALUE);
              jmsSystemPropertyMap = new JsMsgMap(keys, values);
          }
          return jmsSystemPropertyMap;
      }