Spawn fishing hook / fishing bob / fishing line without a fishing rod using protocollib

fishingHook.java

// Spawn fishing hook / fishing bob / fishing line without a fishing rod using protocollib
// Learnings:
//   The hook bobbing on the water is done client side. 
//   fishing hook will just sink thru lava
private void spawnEntity(Location location, Vector vector, EntityType type, int shooterId) {
        int entityId = 10000;

        PacketContainer packet = new PacketContainer(PacketType.Play.Server.SPAWN_ENTITY);

        packet.getIntegers().write(0, entityId);
        packet.getUUIDs().write(0, UUID.randomUUID());
        packet.getEntityTypeModifier().write(0, type);

        packet.getDoubles()
                .write(0, location.getX())
                .write(1, location.getY())
                .write(2, location.getZ());

        packet.getIntegers()
                .write(1, convertVelocity(vector.getX()))
                .write(2, convertVelocity(vector.getY()))
                .write(3, convertVelocity(vector.getZ()))
                .write(4, shooterId);

        for(Player player : Bukkit.getOnlinePlayers()) {
            ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet);
        }
    }
    
     private int convertVelocity(double velocity) {
        return (int) (clamp(velocity, -3.9, 3.9) * 8000);
    }

    private double clamp(double targetNum, double min, double max) {
        return Math.max(min, Math.min(targetNum, max));
    }
    
     @EventHandler
    public void onShift(PlayerToggleSneakEvent e)
    {
        Location location = e.getPlayer().getLocation();

        spawnEntity(location, new Vector(0, 0, 0), EntityType.FISHING_HOOK, e.getPlayer().getEntityId());
    }