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General data-binding functionality for Jackson: works on core streaming API
There is a newer version: 2.17.0
package com.fasterxml.jackson.databind.jsontype.impl;

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.core.*;

import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;

/**
 * Type serializer that will embed type information in an array,
 * as the first element, and actual value as the second element.
 * 
 * @author tatu
 */
public class AsArrayTypeSerializer
    extends TypeSerializerBase
{
    public AsArrayTypeSerializer(TypeIdResolver idRes, BeanProperty property)
    {
        super(idRes, property);
    }

    @Override
    public AsArrayTypeSerializer forProperty(BeanProperty prop) {
        if (_property == prop) return this;
        return new AsArrayTypeSerializer(this._idResolver, prop);
    }
    
    @Override
    public As getTypeInclusion() { return As.WRAPPER_ARRAY; }
    
    /*
    /**********************************************************
    /* Writing prefixes
    /**********************************************************
     */
    
    @Override
    public void writeTypePrefixForObject(Object value, JsonGenerator jgen)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(idFromValue(value));
        jgen.writeStartObject();
    }

    @Override
    public void writeTypePrefixForObject(Object value, JsonGenerator jgen,
            Class type)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(idFromValueAndType(value, type));
        jgen.writeStartObject();
    }
    
    @Override
    public void writeTypePrefixForArray(Object value, JsonGenerator jgen)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(idFromValue(value));
        jgen.writeStartArray();
    }

    @Override
    public void writeTypePrefixForArray(Object value, JsonGenerator jgen,
            Class type)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(idFromValueAndType(value, type));
        jgen.writeStartArray();
    }
    
    @Override
    public void writeTypePrefixForScalar(Object value, JsonGenerator jgen)
            throws IOException, JsonProcessingException
    {
        // only need the wrapper array
        jgen.writeStartArray();
        jgen.writeString(idFromValue(value));
    }

    @Override
    public void writeTypePrefixForScalar(Object value, JsonGenerator jgen,
            Class type)
        throws IOException, JsonProcessingException
    {
        // only need the wrapper array
        jgen.writeStartArray();
        jgen.writeString(idFromValueAndType(value, type));
    }

    /*
    /**********************************************************
    /* Writing suffixes
    /**********************************************************
     */
    
    @Override
    public void writeTypeSuffixForObject(Object value, JsonGenerator jgen)
            throws IOException, JsonProcessingException
    {
        jgen.writeEndObject();
        jgen.writeEndArray();
    }

    @Override
    public void writeTypeSuffixForArray(Object value, JsonGenerator jgen)
            throws IOException, JsonProcessingException
    {
        // wrapper array first, and then array caller needs to close
        jgen.writeEndArray();
        jgen.writeEndArray();
    }

    @Override
    public void writeTypeSuffixForScalar(Object value, JsonGenerator jgen)
            throws IOException, JsonProcessingException
    {
        // just the wrapper array to close
        jgen.writeEndArray();
    }
    
    /*
    /**********************************************************
    /* Writing with custom type id
    /**********************************************************
     */

    @Override
    public void writeCustomTypePrefixForObject(Object value, JsonGenerator jgen, String typeId)
        throws IOException, JsonProcessingException {
        jgen.writeStartArray();
        jgen.writeString(typeId);
        jgen.writeStartObject();
    }
    
    @Override
    public void writeCustomTypePrefixForArray(Object value, JsonGenerator jgen, String typeId)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(typeId);
        jgen.writeStartArray();
    }

    @Override
    public void writeCustomTypePrefixForScalar(Object value, JsonGenerator jgen, String typeId)
        throws IOException, JsonProcessingException
    {
        jgen.writeStartArray();
        jgen.writeString(typeId);
    }

    @Override
    public void writeCustomTypeSuffixForObject(Object value, JsonGenerator jgen, String typeId)
        throws IOException, JsonProcessingException {
        writeTypeSuffixForObject(value, jgen); // standard impl works fine
    }

    @Override
    public void writeCustomTypeSuffixForArray(Object value, JsonGenerator jgen, String typeId)
            throws IOException, JsonProcessingException {
        writeTypeSuffixForArray(value, jgen); // standard impl works fine
    }

    @Override
    public void writeCustomTypeSuffixForScalar(Object value, JsonGenerator jgen, String typeId)
        throws IOException, JsonProcessingException {
        writeTypeSuffixForScalar(value, jgen); // standard impl works fine
    }
}