Solved Adding a potion effect to a player after respawning

My Problems:
I am trying to make a plugin where the world border decreases after dying and the died player gets set into Spectator mode and gets some effects. It turned out that I need a tiny delay.
After googling about delaying something in Bukkit I found this thing called "Scheduler". I tried using it and it showed an error that I can't fix.

In Eclipse is Looks like that:

Code:

                    
                    Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

                        @Override
                        public void run() {
                            //Testing if Scheduler is working
                            Bukkit.getServer().broadcastMessage(ChatColor.RED+"Scheduler is working! YAY! :D");
                            //Trying to add a PotionEffect
                            player.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, 999, 255));
                        }
           
                    }, 20L);

And "scheduleSyncDelayedTask" in the first (line 36 in whole class) line is underlined with the error:

After I tested it anyways on a test server there was this error after clicking the respawn button:

My Questions:
How can I fix this error?
or
Is there another way to give a player some effects after respawning?


My Code:

Code:

package de.Stephan.MiniVaro;

//importing stuff
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.PlayerDeathEvent;
import org.bukkit.event.player.PlayerRespawnEvent;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;



public class Eventlistener implements Listener {
   
   
    public Eventlistener (JavaPlugin plugin){
        plugin.getServer().getPluginManager().registerEvents(this, plugin);
    }
   
    //Adding a PlayerDeath checker
    @EventHandler
    public void onPlayerDeath (PlayerDeathEvent tod){
        //Checking if Round was started
        if(Variables.Round==1){
            //Checking if there are more than one player online
            if(Variables.OnlinePlayers>1){
                //Checking if died Player was in SurvivalMode
                if(tod.getEntity().getGameMode()==GameMode.SURVIVAL){
                    //Decreasing WorldBorder size
                    Variables.b.setSize(Bukkit.getWorld("world").getWorldBorder().getSize()-10,10);
                    //Telling everyone that the WorldBorder is decreasing size
                    Bukkit.getServer().broadcastMessage(ChatColor.AQUA+"The worldborder is shrinking 10 blocks.");
                    //setting GameMode of died player to SPECTATOR
                    tod.getEntity().setGameMode(GameMode.SPECTATOR);
                }
            }
        }
    }
   
    //Adding a PlayerRespwn checker
    @EventHandler
    public void onPlayerSpawn(PlayerRespawnEvent spawn){
        //Testing if it works
        Bukkit.getServer().broadcastMessage("onPlayerSpawn is working! YAY :D");
        Player player = spawn.getPlayer();
        //Checking if Round was started
        if(Variables.Round==1){
            //Checking if there are more than one player online
            if(Variables.OnlinePlayers>1){
                //Checking if respawned Player is in SECTATOR mode
                if(player.getGameMode()==GameMode.SPECTATOR){
                    //Trying to add a PotionEffect
                    player.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, 999, 255));
                   
                    //Trying to give the PotionEffect 5sek later
                    Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

                        @Override
                        public void run() {
                            //Testing if Scheduler is working
                            Bukkit.getServer().broadcastMessage(ChatColor.RED+"Scheduler is working! YAY! :D");
                            //Trying to add a PotionEffect
                            player.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, 999, 255));
                        }
           
                    }, 20L);
                   
                }
            }
        }
    }
   
}

 

@stivi313131
The problem is that you put in your eventlistener class as a Plugin, but you need to put in your Main class (the one which extends javaplugin).

 

scheduleSyncDelayedTask: the first argument needs to be the instance of your main class (extending JavaPlugin)

 

OK, now the Schedule error is gone thanks for that.
But now I got many token errors in Eclipse and server:
(line 36
line 45: public void onPlayerSpawn(PlayerRespawnEvent spawn){
line 65
line 67: }, 20L);

Code:

/* TODO:
     + Custom Spawns
     + Schematics
     + Teams
     + Countdown
     + optimize plugin.yml
     + /MiniVaro-info
*/
package de.Stephan.MiniVaro;
//importing stuff
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.GameMode;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.player.PlayerRespawnEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;



public class MiniVaro extends JavaPlugin{
  
  
  
    @Override
    public void onEnable() {
        super.onEnable();
      
        new Eventlistener(this);
        //set WorldBordersize to 100
        Variables.b.setSize(100);
        }
  
    //Trying to give the PotionEffect 5sek later
    Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

        @Override
        public void run() {
            //Adding a PlayerRespwn checker
            @EventHandler
            public void onPlayerSpawn(PlayerRespawnEvent spawn){
                //Testing if it works
                Bukkit.getServer().broadcastMessage("onPlayerSpawn is working! YAY :D");
                Player player = spawn.getPlayer();
                //Checking if Round was started
                if(Variables.Round==1){
                    //Checking if there are more than one player online
                    if(Variables.OnlinePlayers>1){
                        //Checking if respawned Player is in SECTATOR mode
                        if(player.getGameMode()==GameMode.SPECTATOR){
                            //Testing if Scheduler is working
                            Bukkit.getServer().broadcastMessage(ChatColor.RED+"Scheduler is working! YAY! :D");
                            //Trying to add a PotionEffect
                            player.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, 999, 255));
                          
                        }
                    }
                }
            }

        }

    }, 20L);
  
    //Commands
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
      
        //Command /MiniVaro
        if(command.getName().equalsIgnoreCase("MiniVaro")){
                //send some text to the sender of the Command /MiniVaro
                sender.sendMessage(ChatColor.YELLOW+"Usage:");
                sender.sendMessage(ChatColor.YELLOW+"Enter "+ChatColor.RED+"\"/MiniVaro-start\""+ChatColor.YELLOW+" to start a new Round." );
                sender.sendMessage(ChatColor.YELLOW+"Enter "+ChatColor.RED+"\"/MiniVaro-stop\""+ChatColor.YELLOW+" to stop a Round." );
                sender.sendMessage(ChatColor.YELLOW+"Enter "+ChatColor.RED+"\"/MiniVaro-info\""+ChatColor.YELLOW+" to get info about the MiniVaro plugin." );
        }
      
        //Command /MiniVaro-start
        if(command.getName().equalsIgnoreCase("MiniVaro-start")){
            //start a Round by setting Round to 1
            Variables.Round=1;;
            //Checking if setting Round to 1 has worked
            if(Variables.Round==1){
                sender.sendMessage("Runde gestartet");
            }
        }
      
        //Command /MiniVaro-stop
        if(command.getName().equalsIgnoreCase("MiniVaro-stop")){
            //Stopping a Round by setting Round to 0
            Variables.Round=0;
            if(Variables.Round==0){
                //Checking if setting Round to 0 has worked
                sender.sendMessage("Runde gestoppt");
            }
        }return false;
      
      
      
    }

  
  
}

 

@stivi313131
You cannot create a new method inside another method! What you need to do is make the eventhandler, and inside that, call your delayed task.

 

Thanks.
I don't know why I changed that *facepalm*