docs: private Set<String> getOrMakeJarListing(final String absolutePathToJar) {
  		synchronized (mapTrackerToJarPath) {
  			/*
  			 * 1) Check our private instance JarPath-to-Tracker Mappings:
  			 */
  			Object ourTracker = mapJarPathToTracker.get(absolutePathToJar);
  			if (ourTracker != null) {
  				/*
  				 * Yes, we are already tracking this Jar. Just return its contents...
  				 */
  				return mapTrackerToJarContents.get(ourTracker);
  			}
  			
  			/*
  			 * 2) Not tracked by us as yet. Check statically whether others have tracked this JarPath:
  			 */
  			for (Entry<Object, String> entry : mapTrackerToJarPath.entrySet()) {
  				if (entry.getValue().equals(absolutePathToJar)) {
  					/*
  					 * Yes, 3rd party is tracking this jar. We must track too, then return its contents.
  					 */
  					Object otherTracker = entry.getKey();
  					mapJarPathToTracker.put(absolutePathToJar, otherTracker);
  					return mapTrackerToJarContents.get(otherTracker);
  				}
  			}
  			
  			/*
  			 * 3) Not tracked by anyone so far. Build, publish, track & return Jar contents...
  			 */
  			Object newTracker = new Object();
  			Set<String> jarMembers = getJarMemberSet(absolutePathToJar);
  			
  			mapTrackerToJarContents.put(newTracker, jarMembers);
  			mapTrackerToJarPath.put(newTracker, absolutePathToJar);
  			mapJarPathToTracker.put(absolutePathToJar, newTracker);
  			
  			return jarMembers;
  		}
  	}