code: protected void mappingListJsonBody(ActionRuntime runtime, VirtualForm virtualForm, String json) {
          try {
              final ActionFormMeta formMeta = virtualForm.getFormMeta();
              final ParameterizedType pt = formMeta.getListFormParameterParameterizedType().get(); // already checked
              final List<Object> fromJsonList = getJsonManager().fromJsonParameteried(json, pt);
              acceptJsonRealForm(virtualForm, fromJsonList);
          } catch (RuntimeException e) {
              throwListJsonBodyParseFailureException(runtime, virtualForm, json, e);
          }
      }
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