public static <S,T> NullSafeConverter<S,T> nullSafe(DynamoDBTypeConverter<S,T> converter) {
            return new NullSafeConverter<S,T>(converter);
        }
An abstract converter with additional general purpose functions.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/DynamoDBTypeConverter.java