public BatchGetItemSpec withUnprocessedKeys(
            Map<String, KeysAndAttributes> unprocessedKeys) {
        this.unprocessedKeys = Collections.unmodifiableMap(
                new LinkedHashMap<String, KeysAndAttributes>(unprocessedKeys));
        return this;
    }
Full parameter specification for the BatchGetItem API.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/spec/BatchGetItemSpec.java