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

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

You can also browse Jackson Annotations Source Code below:

⏎ com/fasterxml/jackson/annotation/JacksonAnnotationValue.java

package com.fasterxml.jackson.annotation;

import java.lang.annotation.Annotation;

/**
 * Marker interface used by value classes like {@link JsonFormat.Value} that are used
 * to contain information from one of Jackson annotations, and can be directly
 * instantiated from those annotations, as well as programmatically constructed
 * and possibly merged. The reason for such marker is to allow generic handling of
 * some of the annotations, as well as to allow easier injection of configuration
 * from sources other than annotations.
 *
 * @since 2.6
 */
public interface JacksonAnnotationValue<A extends Annotation>
{
    /**
     * Introspection method that may be used to find actual annotation that may be used
     * as the source for value instance.
     *
     * @return Annotation class for which instances of this value class are created
     */
    public Class<A> valueFor();
}

⏎ com/fasterxml/jackson/annotation/JacksonAnnotationValue.java

Or download all of them as a single archive file:

File name: jackson-annotations-2.14.0-sources.jar
File size: 80402 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Dataformat Extensions

⇐ Jackson Data Binding Source Code

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library