[Bukkit] PlayerInteractEvent funktioniert nicht

package de.computerbaer.test;

import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;

public class TestMain extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }

    @Override
    public void onDisable() {
    }
    
    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {
        Player p = event.getPlayer();
        
        if(event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
            if (p.getItemInHand().getType().equals(Material.IRON_SWORD)) {
                p.sendMessage("Test");
            }
        }
    }
    
}

package de.computerbaer.test;

import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;

public class TestMain extends JavaPlugin {

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(new TestListener(), this);
    }

    @Override
    public void onDisable() {
    }
    
    public class TestListener implements Listener {
        @EventHandler
        public void onPlayerInteract(PlayerInteractEvent event) {
            Player p = event.getPlayer();
            
            if(event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
                if (p.getItemInHand().getType().equals(Material.IRON_SWORD)) {
                    p.sendMessage("Test");
                }
            }
        }
    }
    
}

package de.computerbaer.test;

import org.bukkit.plugin.java.JavaPlugin;

public class TestMain extends JavaPlugin {

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(new TestListener(), this);
    }

    @Override
    public void onDisable() {
    }

}

package de.computerbaer.test;

import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;

public class TestListener implements Listener {
    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {
        Player p = event.getPlayer();
        
        if(event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
            if (p.getItemInHand().getType().equals(Material.IRON_SWORD)) {
                p.sendMessage("Test");
            }
        }
    }
}