Setting seperate scoreboards

Code:

ublic class Main extends JavaPlugin implements Listener{
    public static ScoreboardManager sm = Bukkit.getScoreboardManager();
     public static Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
    public void onDisable(){
   
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
         p.setScoreboard(scoreboards.get(uuid));
     }
    @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable(){

                @Override
                public void run() {
                setScoreboard(p);
               
                }
       
            },20 * 1);
       
     }
}

I was trying to set seperate scoreboards for players but the onPlayerJoinEvent sends a NullPointerException...

 

@timtower
[Scoreboard] Task #2 for Scoreboard v1.0.0 generated an exception
java.lang.NullPointerException
at com.Code.Scoreboard.Main.setScoreboard(Main.java:32) ~[?:?]
at com.Code.Scoreboard.Main$1.run(Main.java:50) ~[?:?]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:641) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]

full error log

 

@timtower
I changed the public static stuff to private.
How would I initalize the variable on the onEnable method ?

Code:

public class Main extends JavaPlugin implements Listener{
    private ScoreboardManager sm = Bukkit.getScoreboardManager();
     private Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
    public void onDisable(){
      
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
     }
    @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable(){

                @Override
                public void run() {
                setScoreboard(p);
                  
                }
          
            },20 * 1);
          
     }
}

 

@timtower Like this?

Code:

public class Main extends JavaPlugin implements Listener{
    private ScoreboardManager sm;
     private Map<UUID, Scoreboard> scoreboards;
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        sm = Bukkit.getScoreboardManager();
        scoreboards = new HashMap<UUID,Scoreboard>();
    }
    public void onDisable(){
       
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
     }
    @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable(){

                @Override
                public void run() {
                setScoreboard(p);
                   
                }
           
            },20 * 1);
           
     }
}

 

edited the code
@timtower It got rid of the npe but no scoreboard apperars

 

@timtower I'very set the scoreboard for the player on the player join using the setScoreboard ()method.