Creating a CompassOnJoin Plugin

Hey so im trying to code this plugin and I am running to the problem where I can no longer place blocks. Like everything else works. It gives me a compass on join in the specified slot. But it like breaks user interaction with blocks. Ill put the code below. Also this is for a Tekkit Classic Server. Minecraft Version 1.2.5 (Ik know its really old)

Code:

public class Main extends JavaPlugin implements Listener{

    public void onEnable() {
        getServer().getConsoleSender().sendMessage(ChatColor.GREEN + "[GiveCompass] has been enabled");
    //register events.
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
    //Set the item in the third slot on join
        e.getPlayer().getInventory().setItem(4, getSelector());
        return;
    }

@EventHandler
    public void onPlayerInteract(PlayerInteractEvent e) {
            ItemStack currentItem = e.getPlayer().getItemInHand();
            if (currentItem == null || currentItem.getType() == Material.AIR) return;
            e.setCancelled(true);
            return;
        }



    private ItemStack getSelector(){
    ItemStack serverSelector = new ItemStack(Material.COMPASS);
        return serverSelector;
    }

@Override
public void onDisable() {
    getServer().getConsoleSender().sendMessage(ChatColor.RED + "[GiveCompass] has been disabled");
}
}

Hey I got it to work with this

Code:

public class Main extends JavaPlugin implements Listener{

    public void onEnable() {
        this.getServer().getPluginManager().registerEvents((Listener)this, (Plugin)this);
        System.out.println(ChatColor.GREEN + "[GiveCompass] has been enabled");
    }
    public void onDisabled() {
        this.getServer().getPluginManager().registerEvents((Listener)this, (Plugin)this);
        System.out.println(ChatColor.RED + "[GiveCompass] has been disabled");
    }
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event) {
        if (!event.getPlayer().getInventory().contains(Material.COMPASS)) {
            final Inventory inventory = event.getPlayer().getInventory();
            ItemStack[] ServerSelectorItems = {new ItemStack(Material.COMPASS)}; 
            inventory.addItem(ServerSelectorItems);

        }
    }
}

EDIT by Moderator: merged posts, please use the edit button instead of double posting.