Bukkit treefeller (should work with logging)

  @EventHandler
  public void onblockBreak(BlockBreakEvent event) {
    if (!event.isCancelled()) {
      Block brokenBlock = event.getBlock();
       if (brokenBlock.getType() == Material.LOG || brokenBlock.getType() == Material.LOG_2) {
        breakAboveLogs(brokenBlock, event.getPlayer());
      }
    }
  }

  private void breakAboveLogs(Block block, Player player) {
    Location loc = block.getLocation();
    loc.add(0, 1, 0);
    Block aboveBlock = block.getWorld().getBlockAt(loc);
    if (aboveBlock.getType() == Material.LOG || aboveBlock.getType() == Material.LOG_2) {
      BlockBreakEvent aboveBreakEvent = new BlockBreakEvent(aboveBlock, player);
      Bukkit.getServer().getPluginManager().callEvent(aboveBreakEvent);
      if(!aboveBreakEvent.isCancelled()) {
        aboveBlock.breakNaturally();
        breakAboveLogs(aboveBlock, player);
      }
    }
  }