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

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

You can also browse Jackson Core Source Code below:

⏎ com/fasterxml/jackson/core/async/ByteBufferFeeder.java

package com.fasterxml.jackson.core.async;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * {@link NonBlockingInputFeeder} implementation used when feeding data
 * as {@link ByteBuffer} contents.
 *
 * @since 2.9
 */
public interface ByteBufferFeeder extends NonBlockingInputFeeder
{
     /**
      * Method that can be called to feed more data, if (and only if)
      * {@link NonBlockingInputFeeder#needMoreInput} returns true.
      * 
      * @param buffer Buffer that contains additional input to read
      * 
      * @throws IOException if the state is such that this method should not be called
      *   (has not yet consumed existing input data, or has been marked as closed)
      */
     public void feedInput(ByteBuffer buffer) throws IOException;
}

⏎ com/fasterxml/jackson/core/async/ByteBufferFeeder.java

Or download all of them as a single archive file:

File name: jackson-core-2.14.0-sources.jar
File size: 497693 bytes
Release date: 2022-11-05
Download 

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⇑⇑ Jackson - Java JSON library