USkyWars API

import teamgx.kubig.skywars.api.GameWinEvent;
import teamgx.kubig.skywars.game.Game;
import teamgx.kubig.skywars.manager.GameManager;

import org.bukkit.inventory.meta.FireworkMeta;
import org.bukkit.entity.Firework;
import org.bukkit.Color;
import org.bukkit.FireworkEffect;
import org.bukkit.entity.Firework;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;

public class GameWinEffect
implements Listener {

     @EventHandler
    public void onGameEnd(GameWinEvent e) {
     GameTeam team = e.getWinner();
      for(GamePlayer gamePlayer : team.getPlayer()) {
       if(gamePlayer != null) {
        launch_fireworks(gamePlayer);
        e.setCancelled(true);
       }
      }
    }

    public void launch_fireworks(GamePlayer gamePlayer) {
    Firework fireworks = (Firework)gamePlayer.getPlayer().getWorld().spawn(gamePlayer.getPlayer().getLocation().clone().add(0.5D, 0.5D, 0.5D), Firework.class);
    FireworkMeta fireworksmeta = fireworks.getFireworkMeta();
       
    FireworkEffect fireworkseffect = FireworkEffect.builder().with(FireworkEffect.Type.BALL).withColor(Color.YELLOW).withFade(Color.AQUA).flicker(true).trail(true).build();
    fireworksmeta.setPower(1);
    fireworksmeta.addEffect(fireworkseffect);
    fireworks.setFireworkMeta(fireworksmeta);
    }
}

package teamgx.example.uskywars.animation;

import org.bukkit.Color;
import org.bukkit.Effect;
import org.bukkit.FireworkEffect;
import org.bukkit.Location;
import org.bukkit.entity.Firework;
import org.bukkit.inventory.meta.FireworkMeta;
import org.bukkit.scheduler.BukkitRunnable;

import teamgx.kubig25.uskywars.USkyWars;
import teamgx.kubig25.uskywars.api.SoulAnimationAPI;

public class SoulAnimation
extends SoulAnimationAPI {

    @Override
    public void onServer(Location location) {}
 
    @Override
    public void before(Player player, Location location) {}

    @Override
    public void start(Player player, Location location) {
    new BukkitRunnable() {
      public void run() {
       location.getWorld().playEffect(location, Effect.MOBSPAWNER_FLAMES, 5);
      }
    }.runTaskLater(USkyWars.get(), 1L);
    }

    @Override
    public void end(Player player, Location location) {
    Firework fw = (Firework)location.getWorld().spawn(location, Firework.class);
    FireworkMeta data = fw.getFireworkMeta();
    data.addEffects( new FireworkEffect[] { FireworkEffect.builder().withColor(Color.RED).with(FireworkEffect.Type.BALL).build() });
    data.setPower(1);
    fw.setFireworkMeta(data);
    new BukkitRunnable() {
      public void run() {
       fw.detonate();
      }
    }.runTaskLater(USkyWars.get(), 1L);
    }

    @Override
    public void after(Player player, Location location) {}

    @Override
    public void offServer(Location location) {}

}