generic serialization with logansquared

gistfile1.java

public class GenericTypeConverter implements TypeConverter<GenericTypeConverter.GenericType> {
    @Override
    public GenericType parse(JsonParser jsonParser) throws IOException {
        String field = null;
        String value = null;

        String fieldType = null;
        String data = null;


        while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            if (jsonParser.getCurrentToken() == JsonToken.VALUE_STRING) {
                value = jsonParser.getValueAsString();
            } else if (jsonParser.getCurrentToken() == JsonToken.FIELD_NAME) {
                field = jsonParser.getCurrentName();
            }
            if (value != null && field != null) {
                if ("__TYPE".equals(field)) {
                    fieldType = value;
                } else {
                    data = value;
                }
                value = null;
                field = null;
            }
        }

        try {
            Class screenType = (Class) Class.forName(fieldType);
            Object o = LoganSquare.parse(data, screenType);
            return (GenericType) o;
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            throw new IllegalStateException(e);
        }
    }

    @Override
    public void serialize(GenericType object, String fieldName, boolean writeFieldNameForObject, JsonGenerator jsonGenerator) throws IOException {
        jsonGenerator.writeObjectFieldStart(fieldName);
        jsonGenerator.writeStringField("__TYPE", object.getClass().getName());
        jsonGenerator.writeStringField(fieldName, LoganSquare.serialize(object));
        jsonGenerator.writeEndObject();
    }


    public interface GenericType {

    }
}

gistfile2.java

@JsonObject
public class TestA {
    @JsonField GenericType x;
}

@JsonObject
public GenericImpl implements GenericType {
    @JsonField String test;
}