Scoreboard Problem

So my goal is to create a simple scoreboard for each player that join the server. I've put the `setScoreboard();` on the `PlayerJoinEvent` but when I join the server, the scoreboard is not there.

So this is what I've do.

Main class:

Code:

    package can.evilestvirus.board;
  
    import org.bukkit.entity.Player;
    import org.bukkit.event.EventHandler;
    import org.bukkit.event.Listener;
    import org.bukkit.event.player.PlayerJoinEvent;
    import org.bukkit.plugin.java.JavaPlugin;
  
    import java.util.HashMap;
  
    public class Board extends JavaPlugin implements Listener {
  
        public HashMap<Player, ScoreboardManager> sb = new HashMap<>();
  
        public static Board instance;
  
        public static Board getInstance(){
            return instance;
        }
  
        @Override
        public void onEnable() {
            instance = this;
            new ScoreboardRunnable().runTaskTimer(this, 0L, 20L);
            getServer().getPluginManager().registerEvents(this, this);
            super.onEnable();
        }
  
        @EventHandler
        public void onJoin(PlayerJoinEvent event){
            Player player = event.getPlayer();
            ScoreboardManager board = new ScoreboardManager(player);
            board.refresh();
            board.setScoreboard();
        }
    }

My ScoreboardManager:

Code:

    package can.evilestvirus.board;
   
    import org.bukkit.Bukkit;
    import org.bukkit.entity.Player;
    import org.bukkit.scoreboard.DisplaySlot;
    import org.bukkit.scoreboard.Objective;
    import org.bukkit.scoreboard.Scoreboard;
   
    import java.util.Random;
   
    public class ScoreboardManager implements org.bukkit.scoreboard.ScoreboardManager {
   
        public Scoreboard scoreboard;
        public Objective objective;
        public String name = "scoreboard";
   
        public Player player;
   
        public ScoreboardManager(Player player){
            this.player = player;
            this.scoreboard = Bukkit.getScoreboardManager().getNewScoreboard();
            this.name = "sb." + new Random().nextInt(99999);
            this.objective = scoreboard.registerNewObjective(name, "dummy");
            objective.setDisplayName("ScoreBoard");
            objective.setDisplaySlot(DisplaySlot.SIDEBAR);
   
            if(Board.getInstance().sb.containsKey(player)) return;
   
            Board.getInstance().sb.put(player, this);
        }
   
        @Override
        public Scoreboard getMainScoreboard() {
   
            return scoreboard;
        }
   
        @Override
        public Scoreboard getNewScoreboard() {
            return null;
        }
   
        public void refresh() {
   
        }
   
        public void sendLine(){
            objective.getScore("§4➤ §6§lJoueur: " + player.getDisplayName()).setScore(0);
   
        }
   
        public void setScoreboard(){
            player.setScoreboard(scoreboard);
        }
    }

This is my Scoreboard refresh class:

Code:

    package can.evilestvirus.board;
   
    import org.bukkit.entity.Player;
    import org.bukkit.scheduler.BukkitRunnable;
   
    import java.util.Map.Entry;
   
    public class ScoreboardRunnable extends BukkitRunnable {
   
        @Override
        public void run() {
            for(Entry<Player, ScoreboardManager> scoreboard: Board.getInstance().sb.entrySet()){
                ScoreboardManager board = scoreboard.getValue();
                board.refresh();
            }
        }
    }

 

Register classes maybe?