code: public void batchWrite(List<? extends Object> objectsToWrite, List<? extends Object> objectsToDelete) {
          batchWrite(objectsToWrite, objectsToDelete, this.config);
      }
docs: Saves and deletes the objects given using one or more calls to the
  {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API.
  
  @see DynamoDBMapper#batchWrite(List, List, DynamoDBMapperConfig)