onInventoryOpen not called?

Whats wrong with this?
It wont get called when a player opens his/her inventory.

Main class:

Code:

package com.vildaberper.InventoryExpander;

import org.bukkit.event.Event.Priority;
import org.bukkit.event.Event.Type;
import org.bukkit.plugin.java.JavaPlugin;

public class InventoryExpander extends JavaPlugin{
	private final InventoryExpanderPlayerListener playerListener = new InventoryExpanderPlayerListener();

	@Override
	public void onDisable(){
		System.out.println(this.getDescription().getName() + " " + this.getDescription().getVersion() + " is disabled.");
	}
	@Override
	public void onEnable(){
		this.getServer().getPluginManager().registerEvent(Type.INVENTORY_OPEN, playerListener, Priority.High, this);
		System.out.println(this.getDescription().getName() + " " + this.getDescription().getVersion() + " is enabled.");
	}
}

PlayerListener:

Code:

package com.vildaberper.InventoryExpander;

import org.bukkit.event.player.PlayerInventoryEvent;
import org.bukkit.event.player.PlayerListener;

public class InventoryExpanderPlayerListener extends PlayerListener{
	@Override
	public void onInventoryOpen(PlayerInventoryEvent event){
		event.getPlayer().sendMessage("derp");
		System.out.println("derp");
	}
}

 

EDIT:

Nevermind, after writing it from scratch on my own I also cannot get it to work.

I notice a pull request on the bukkit github for Inventory Open/Close so that would suggest to me that they haven't been properly implemented.

 

Ah, I guess thats why. Thanks.
I was going crazy.

 

I tried the same, I guess it's not implemented yet.