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/ser/impl/UnsupportedTypeSerializer.java

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

import java.io.IOException;

import com.fasterxml.jackson.core.*;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

/**
 * Special bogus "serializer" that will throw
 * {@link com.fasterxml.jackson.databind.exc.InvalidDefinitionException} if its {@link #serialize}
 * gets invoked. Most commonly registered as handler for unknown types,
 * as well as for catching unintended usage (like trying to use null
 * as Map/Object key).
 */
public class UnsupportedTypeSerializer
    extends StdSerializer<Object>
{
    private static final long serialVersionUID = 1L;

    protected final JavaType _type;

    protected final String _message;

    public UnsupportedTypeSerializer(JavaType t, String msg) {
        super(Object.class);
        _type = t;
        _message = msg;
    }

    @Override
    public void serialize(Object value, JsonGenerator g, SerializerProvider ctxt) throws IOException {
        ctxt.reportBadDefinition(_type, _message);
    }
}

⏎ com/fasterxml/jackson/databind/ser/impl/UnsupportedTypeSerializer.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