@Override
    public Object unmarshall(AttributeValue value) throws ParseException {
        List<AttributeValue> values = value.getL();
        List<Object> objects = new ArrayList<Object>(values.size());

        for (AttributeValue v : values) {
            memberUnmarshaller.typeCheck(v, null);
            objects.add(memberUnmarshaller.unmarshall(v));
        }

        return objects;
    }
An unmarshaller that unmarshals Lists into Java {@code Lists}.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/unmarshallers/ListUnmarshaller.java