code: private void render() throws RenderableException {
          try {
              rendered = OBJECT_WRITER.writeValueAsBytes(node);
          } catch (JsonProcessingException e) {
              throw new RenderableException("cannot write the JSON form of " + node, e);
          }
      }
docs: Renders the JSON object as a byte array. Be aware that this method does not use the {@link org.wisdom.api
  .content.Json} service.
  
  @throws RenderableException if the node cannot be rendered