https://github.com/FasterXML/jackson-core: Core Jackson processing abstractions (aka Streaming API), implementation for JSON (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
/* Jackson JSON-processor.
 *
 * Copyright (c) 2007- Tatu Saloranta, tatu.saloranta@iki.fi
 */

package com.fasterxml.jackson.core;


Interface that those Jackson components that are explicitly versioned will implement.
Intention is to allow both plug-in components (custom extensions) and applications and
frameworks that use Jackson to detect exact version of Jackson in use.
This may be useful for example for ensuring that proper Jackson version is deployed
(beyond mechanisms that deployment system may have), as well as for possible
workarounds.

/**
 * Interface that those Jackson components that are explicitly versioned will implement.
 * Intention is to allow both plug-in components (custom extensions) and applications and
 * frameworks that use Jackson to detect exact version of Jackson in use.
 * This may be useful for example for ensuring that proper Jackson version is deployed
 * (beyond mechanisms that deployment system may have), as well as for possible
 * workarounds.
 */
public interface Versioned {
    
Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (see Version for details). 
/**
     * Method called to detect version of the component that implements this interface;
     * returned version should never be null, but may return specific "not available"
     * instance (see {@link Version} for details).
     */
    Version version();
}