Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/jsontype/impl/AsExistingPropertyTypeSerializer.java

package com.fasterxml.jackson.databind.jsontype.impl;

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

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

/**
 * Type serializer used with {@link As#EXISTING_PROPERTY} inclusion mechanism.
 * Expects type information to be a well-defined property on all sub-classes.
 */
public class AsExistingPropertyTypeSerializer
    extends AsPropertyTypeSerializer
{
    public AsExistingPropertyTypeSerializer(TypeIdResolver idRes,
            BeanProperty property, String propName)
    {
        super(idRes, property, propName);
    }

    @Override
    public AsExistingPropertyTypeSerializer forProperty(BeanProperty prop) {
        return (_property == prop) ? this :
            new AsExistingPropertyTypeSerializer(_idResolver, prop, _typePropertyName);
    }

    @Override
    public As getTypeInclusion() { return As.EXISTING_PROPERTY; }
}

⏎ com/fasterxml/jackson/databind/jsontype/impl/AsExistingPropertyTypeSerializer.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library