docs: public void marshall(GetPlanRequest getPlanRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (getPlanRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(getPlanRequest.getMapping(), MAPPING_BINDING);
              protocolMarshaller.marshall(getPlanRequest.getSource(), SOURCE_BINDING);
              protocolMarshaller.marshall(getPlanRequest.getSinks(), SINKS_BINDING);
              protocolMarshaller.marshall(getPlanRequest.getLocation(), LOCATION_BINDING);
              protocolMarshaller.marshall(getPlanRequest.getLanguage(), LANGUAGE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }