@EventHandler
    public void onPlayerToggleFlight(PlayerToggleFlightEvent event) {
        Player player = event.getPlayer();
        if (player.getGameMode() == GameMode.CREATIVE)
            return;
        event.setCancelled(true);
        player.setAllowFlight(false);
        player.setFlying(false);
        player.setVelocity(player.getLocation().getDirection()
                .multiply(1.5).setY(1));
    }
    @EventHandler
    public void onPlayerMove(PlayerMoveEvent event) {
            Player player = event.getPlayer();
              if ((player.getGameMode() != GameMode.CREATIVE)
               && (player.getLocation().subtract(0, 1, 0).getBlock().getType() != Material.AIR)
               && (!player.isFlying()))
                      player.setAllowFlight(true);

    }

}