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/std/ToEmptyObjectSerializer.java

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

import java.io.IOException;
import java.lang.reflect.Type;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.core.type.WritableTypeId;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

/**
 * Simple "bogus" serializer that will just serialize an empty
 * Object for any given value.
 * Quite similar to {@code UnknownSerializer} with the exception that
 * serialization never fails.
 *
 * @since 2.13
 */
@JacksonStdImpl
@SuppressWarnings("serial")
public class ToEmptyObjectSerializer
    extends StdSerializer<Object>
{
    protected ToEmptyObjectSerializer(Class<?> raw) {
        super(raw, false);
    }

    public ToEmptyObjectSerializer(JavaType type) {
        super(type);
    }

    @Override
    public void serialize(Object value, JsonGenerator gen, SerializerProvider ctxt) throws IOException
    {
        gen.writeStartObject(value, 0);
        gen.writeEndObject();
    }

    @Override
    public void serializeWithType(Object value, JsonGenerator gen,
            SerializerProvider ctxt, TypeSerializer typeSer) throws IOException
    {
        WritableTypeId typeIdDef = typeSer.writeTypePrefix(gen,
                typeSer.typeId(value, JsonToken.START_OBJECT));
        typeSer.writeTypeSuffix(gen, typeIdDef);
    }

    @Override
    public boolean isEmpty(SerializerProvider provider, Object value) {
        return true;
    }

    @Override
    public JsonNode getSchema(SerializerProvider provider, Type typeHint)
            throws JsonMappingException {
        return null;
    }

    @Override
    public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor,
            JavaType typeHint)
        throws JsonMappingException
    {
        /*JsonObjectFormatVisitor v =*/ visitor.expectObjectFormat(typeHint);
    }
}

⏎ com/fasterxml/jackson/databind/ser/std/ToEmptyObjectSerializer.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

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⇑⇑ Jackson - Java JSON library