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-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/deser/NullValueProvider.java

package com.fasterxml.jackson.databind.deser;

import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.util.AccessPattern;

/**
 * Helper interface implemented by classes that are to be used as
 * null providers during deserialization. Most importantly implemented by
 * {@link com.fasterxml.jackson.databind.JsonDeserializer} (as a mix-in
 * interface), but also by converters used to support more configurable
 * null replacement.
 *
 * @since 2.9
 */
public interface NullValueProvider
{
    /**
     * Method called to possibly convert incoming `null` token (read via
     * underlying streaming input source) into other value of type accessor
     * supports. May return `null`, or value compatible with type binding.
     *<p>
     * NOTE: if {@link #getNullAccessPattern()} returns `ALWAYS_NULL` or
     * `CONSTANT`, this method WILL NOT use provided `ctxt` and it may thus
     * be passed as `null`.
     */
    public Object getNullValue(DeserializationContext ctxt) throws JsonMappingException;

    /**
     * Accessor that may be used to determine if and when provider must be called to
     * access null replacement value.
     */
    public AccessPattern getNullAccessPattern(); 
}

⏎ com/fasterxml/jackson/databind/deser/NullValueProvider.java

 

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