code: private void register(Path path) throws IOException {
          ////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
          //// USUALLY THIS IS THE DEFAULT WAY TO REGISTER THE EVENTS:
          ////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
          //        WatchKey watchKey = path.register(
          //                watchService, 
          //                ENTRY_CREATE, 
          //                ENTRY_DELETE,
          //                ENTRY_MODIFY);
          
          ////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
          //// BUT THIS IS DAMN SLOW (at least on a Mac)
          //// THEREFORE WE USE EVENTS FROM COM.SUN PACKAGES THAT ARE WAY FASTER
          //// THIS MIGHT BREAK COMPATIBILITY WITH OTHER JDKs
          //// MORE: http://stackoverflow.com/questions/9588737/is-java-7-watchservice-slow-for-anyone-else
          ////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
          WatchKey watchKey = path.register(
              watchService,
              new WatchEvent.Kind[]{
                  StandardWatchEventKinds.ENTRY_CREATE,
                  StandardWatchEventKinds.ENTRY_MODIFY,
                  StandardWatchEventKinds.ENTRY_DELETE
              }, 
              SensitivityWatchEventModifier.HIGH);
          
          mapOfWatchKeysToPaths.put(watchKey, path);
      }
docs: Register the given path with the WatchService