docs: private JsonNode invokeCallbackGet(final GetRequest req) {
          Object obj = this.getObject(req.getObjref());
          String methodName = javaScriptPropertyToJavaPropertyName("get", req.getProperty());
          try {
              Method getter = obj.getClass().getMethod(methodName);
              return JsiiObjectMapper.valueToTree(invokeMethod(obj, getter));
          } catch (NoSuchMethodException e) {
              throw new JsiiException(e);
          }
      }