Code

  @EventHandler
  public void onEntityDamage(EntityDamageByEntityEvent e) {
	  if (e.getCause() != DamageCause.MAGIC) {
	  if (e.getDamager().getType() == EntityType.PLAYER) {
		  Player p = (Player)e.getDamager();
		  ItemStack i = p.getItemInHand();
		  if (i.getType().toString().endsWith("AXE")) {
			  Map<Enchantment, Integer> enchants = i.getEnchantments();
			  if (enchants.containsKey(Enchantment.DIG_SPEED)) {
				  final int level = enchants.get(Enchantment.DIG_SPEED);
				  final double dmg = e.getDamage();
				  double radius = cleaveRadiusBase + (cleaveRadiusScale * (level - 1));
				  double max = cleaveMaxTargetsBase + (cleaveMaxTargetsScale * (level - 1));
				  int count = 0;
				  List<Entity> near = e.getEntity().getNearbyEntities(radius,radius,radius);
				  for (Entity ent : near) {
					  final Entity finalEntity = ent;
					  final Player finalDamager = p;
					  if ((ent instanceof Damageable) && (ent != p) && (count < max)) {
					  count++;//"One more target has been hit. Proceed with 1 less to go"
					  this.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
						  @Override
						  public void run() {
							  EntityDamageByEntityEvent fake = new EntityDamageByEntityEvent(finalEntity, finalDamager, DamageCause.MAGIC, null, null);
							  Bukkit.getPluginManager().callEvent(fake);

							  if (!fake.isCancelled()) {
								  ((Damageable) finalEntity).damage(dmg * cleaveDamageScale * level);

							  }
						  }
					  }, 1L);
					  }
				  }
			  }
		  }