Solved [HELP REQUEST] Naming items

I'm trying to learn how to make plugins, but got stuck on this one. I want to make a plugin that gives a player some items when they join. When these items are clicked, a GUI opens. This just works normally, but I can't figure out how to rename the items. This is the code I got, which doesn't work:

Code:java

@EventHandler
public void onPlayerJoin(PlayerJoinEvent event) {
        ItemStack joinItem = new ItemStack(Material.EMERALD);
        ItemMeta joinItemMeta = joinItem.getItemMeta();
        joinItemMeta.setDisplayName("NAME");
        joinItem.setItemMeta(joinItemMeta);
        event.getPlayer().getInventory().addItem(joinItem);
}

Of course, just as I posted this request, I got it..
Here's the new code:

Code:java

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event) {
        ItemStack joinEmerald = new ItemStack(Material.EMERALD);
        ItemMeta itemMeta = joinEmerald.getItemMeta();
        itemMeta.setDisplayName(ChatColor.GREEN + "Teleporter");
        joinEmerald.setItemMeta(itemMeta);
        event.getPlayer().getInventory().addItem(joinEmerald);
    }

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