code: public void marshall(App app, ProtocolMarshaller protocolMarshaller) {
  
          if (app == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(app.getAppId(), APPID_BINDING);
              protocolMarshaller.marshall(app.getStackId(), STACKID_BINDING);
              protocolMarshaller.marshall(app.getShortname(), SHORTNAME_BINDING);
              protocolMarshaller.marshall(app.getName(), NAME_BINDING);
              protocolMarshaller.marshall(app.getDescription(), DESCRIPTION_BINDING);
              protocolMarshaller.marshall(app.getDataSources(), DATASOURCES_BINDING);
              protocolMarshaller.marshall(app.getType(), TYPE_BINDING);
              protocolMarshaller.marshall(app.getAppSource(), APPSOURCE_BINDING);
              protocolMarshaller.marshall(app.getDomains(), DOMAINS_BINDING);
              protocolMarshaller.marshall(app.getEnableSsl(), ENABLESSL_BINDING);
              protocolMarshaller.marshall(app.getSslConfiguration(), SSLCONFIGURATION_BINDING);
              protocolMarshaller.marshall(app.getAttributes(), ATTRIBUTES_BINDING);
              protocolMarshaller.marshall(app.getCreatedAt(), CREATEDAT_BINDING);
              protocolMarshaller.marshall(app.getEnvironment(), ENVIRONMENT_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.