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/deser/std/NullifyingDeserializer.java

package com.fasterxml.jackson.databind.deser.std;

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;

/**
 * Bogus deserializer that will simply skip all content there is to map
 * and returns Java null reference.
 *
 * @since 2.2
 */
public class NullifyingDeserializer
    extends StdDeserializer<Object>
{
    private static final long serialVersionUID = 1L;

    public final static NullifyingDeserializer instance = new NullifyingDeserializer();
    
    public NullifyingDeserializer() { super(Object.class); }

    /*
    /**********************************************************
    /* Deserializer API
    /**********************************************************
     */

    @Override // since 2.9
    public Boolean supportsUpdate(DeserializationConfig config) {
        return Boolean.FALSE;
    }

    @Override
    public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException
    {
        // 29-Jan-2016, tatu: Simple skipping for all other tokens, but FIELD_NAME bit
        //    special unfortunately
        if (p.hasToken(JsonToken.FIELD_NAME)) {
            while (true) {
                JsonToken t = p.nextToken();
                if ((t == null) || (t == JsonToken.END_OBJECT)) {
                    break;
                }
                p.skipChildren();
            }
        } else {
            p.skipChildren();
        }
        return null;
    }

    @Override
    public Object deserializeWithType(JsonParser p, DeserializationContext ctxt,
            TypeDeserializer typeDeserializer) throws IOException
    {
        // Not sure if we need to bother but:

        switch (p.currentTokenId()) {
        case JsonTokenId.ID_START_ARRAY:
        case JsonTokenId.ID_START_OBJECT:
        case JsonTokenId.ID_FIELD_NAME:
            return typeDeserializer.deserializeTypedFromAny(p, ctxt);
        default:
            return null;
        }
    }
}

⏎ com/fasterxml/jackson/databind/deser/std/NullifyingDeserializer.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 

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⇑⇑ Jackson - Java JSON library