public List<DynamoDBMapper.FailedBatch> batchSave(Iterable<T> objectsToSave) {
        return mapper.batchWrite(objectsToSave, (Iterable<T>)Collections.<T>emptyList());
    }
Saves the objects given using one or more calls to the batchWriteItem API.
@param objectsToSave The objects to save.
@return The list of failed batches.
@see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper#batchSave
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/DynamoDBTableMapper.java