whole class

package me.bacon.plugin;

import java.util.logging.Logger;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.inventory.InventoryMoveItemEvent;
import org.bukkit.event.inventory.InventoryType.SlotType;
import org.bukkit.inventory.InventoryHolder;
import org.bukkit.plugin.PluginDescriptionFile;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

public class Main extends JavaPlugin implements Listener{
	Logger logger = Logger.getLogger("Minecraft");
	public static Main plugin;

	public void onDisable() {
		PluginDescriptionFile pdfFile = this.getDescription();
		this.logger.info(pdfFile.getName() + " Has been disabled!");
	}

	public void onEnable() {
		plugin = this;
		PluginDescriptionFile pdfFile = this.getDescription();
		this.logger.info(pdfFile.getName() + " Version: "
				+ pdfFile.getVersion() + " Has been Enabled!");
		PluginManager pm = getServer().getPluginManager();
		pm.registerEvents(this, this);
		getConfig().options().copyDefaults(true);
		saveConfig();
	}

	public void onInventoryClick(InventoryClickEvent e){
		 System.out.println("reached event");
		if(e.getSlotType() == SlotType.ARMOR){
			 System.out.println("reached 1");
			if(e.getCurrentItem().getItemMeta().getDisplayName().equalsIgnoreCase(ChatColor.translateAlternateColorCodes('&', "&6Basic Mining Helmet"))){
				 System.out.println("reached 2");
				if(e.getInventory().getHolder() instanceof Player){
					 System.out.println("reached 3");
			 Player p = (Player) e.getInventory().getHolder();
			p.addPotionEffect(new PotionEffect(PotionEffectType.NIGHT_VISION, Integer.MAX_VALUE, 1));
			}
			}
		}
	}
}