docs: public void marshall(GetItemRequest getItemRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (getItemRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(getItemRequest.getTableName(), TABLENAME_BINDING);
              protocolMarshaller.marshall(getItemRequest.getKey(), KEY_BINDING);
              protocolMarshaller.marshall(getItemRequest.getAttributesToGet(), ATTRIBUTESTOGET_BINDING);
              protocolMarshaller.marshall(getItemRequest.getConsistentRead(), CONSISTENTREAD_BINDING);
              protocolMarshaller.marshall(getItemRequest.getReturnConsumedCapacity(), RETURNCONSUMEDCAPACITY_BINDING);
              protocolMarshaller.marshall(getItemRequest.getProjectionExpression(), PROJECTIONEXPRESSION_BINDING);
              protocolMarshaller.marshall(getItemRequest.getExpressionAttributeNames(), EXPRESSIONATTRIBUTENAMES_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }