example.java

import com.comphenix.protocol.PacketType;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketEvent;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.plugin.Plugin;

public class InternalPlayerPacketListener extends PacketAdapter implements Listener {

  public InternalPlayerPacketListener(Plugin plugin) {
    super(plugin,
      PacketType.Play.Server.REL_ENTITY_MOVE,
      PacketType.Play.Server.REL_ENTITY_MOVE_LOOK,
      PacketType.Play.Server.ENTITY_VELOCITY,
      PacketType.Play.Server.ENTITY_TELEPORT
    );
  }

  @Override
  public void onPacketSending(PacketEvent event) {
    if (event.isAsync() || event.isAsynchronous()) {
      return;
    }

    Player receiver = event.getPlayer();
    int entityId = event.getPacket().getIntegers().read(0);

    Entity entityFromID = ProtocolLibrary.getProtocolManager().getEntityFromID(receiver.getWorld(), entityId);
    if (!(entityFromID instanceof Player)) {
      return;
    }

    Player player = (Player) entityFromID;
    
    // Hologram hologram = get players hologram
    // hologram.teleport(player.getLocation().clone().add(0 , 2.1 , 0));
  }
}