code: public void batchDelete(Object... objectsToDelete) {
          batchWrite(Collections.emptyList(), Arrays.asList(objectsToDelete), this.config);
      }
docs: Deletes the objects given using one or more calls to the
  {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API.
  
  @see DynamoDBMapper#batchWrite(List, List, DynamoDBMapperConfig)