@Override
            public byte[] apply(Object t) {
                return t.toString().getBytes();
            }
        };

        // ## Act ##
        resultData.setSerializer(serializer);

        // ## Assert ##
        assertNotNull(resultData.serializer);

        resultData.setRawData("hoge");
        assertEquals("hoge", new String(resultData.getData()));
    }

    public Object getRawData() {
        return rawData;
    }

    /**
     * Set the serializer.
     * @param serializer the serializer function to convert raw data to byte array
     */
    public void setSerializer(final Function<Object, byte[]> serializer) {
        this.serializer = serializer;
    }

    /**
     * Get the data.
     * @return data
     */
    public byte[] getData() {
        if (data == null) {

        final ResultData resultData = new ResultData();
        resultData.setTransformerName(getName());
        try {
            resultData.setRawData(generateData(responseData));
            resultData.setSerializer(dataSerializer::fromObjectToBinary);
        } catch (final Exception e) {
            throw new CrawlingAccessException("Could not serialize object", e);
        }

        dataMap = processAdditionalData(dataMap, responseData, document);
        normalizeData(responseData, dataMap);

        try {
            resultData.setRawData(dataMap);
            resultData.setSerializer(dataSerializer::fromObjectToBinary);
        } catch (final Exception e) {
            throw new CrawlingAccessException("Could not serialize object: " + responseData.getUrl(), e);
        }

// RegisterSerializer register serializer
func RegisterSerializer(name string, serializer SerializerInterface) {
	serializerMap.Store(strings.ToLower(name), serializer)
}

// GetSerializer get serializer
func GetSerializer(name string) (serializer SerializerInterface, ok bool) {
	v, ok := serializerMap.Load(strings.ToLower(name))
	if ok {
		serializer, ok = v.(SerializerInterface)
	}
	return serializer, ok
}

	} else {
		serializerName := field.TagSettings["JSON"]
		if serializerName == "" {
			serializerName = field.TagSettings["SERIALIZER"]
		}
		if serializerName != "" {
			if serializer, ok := GetSerializer(serializerName); ok {
				// Set default data type to string for serializer
				field.DataType = String
				field.Serializer = serializer
			} else {