A simpler faster system for registering bukkit event listeners. Scala Version: https://git.io/fAaV0

Events.java

import org.bukkit.Bukkit;
import org.bukkit.event.Event;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.HandlerList;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.EventExecutor;
import java.util.function.Consumer;

public interface Events extends Listener, EventExecutor {
	static <T extends Event> Events listen(
			Plugin plugin,
			Class<T> type,
			Consumer<T> listener
	) { return listen(plugin, type, EventPriority.NORMAL, listener); }
	
	static <T extends Event> Events listen(
			Plugin plugin,
			Class<T> type,
			EventPriority priority,
			Consumer<T> listener
	) {
		final Events events = ($, event) -> listener.accept((T) event);
		Bukkit.getPluginManager().registerEvent(type, events, priority, events, plugin);
		return events;
	}
	
	default void unregister() {
		HandlerList.unregisterAll(this);
	}
}