Solved Error on ItemStack

I have this bit of code to turn items into strings:

Spoiler

Code (Text):

public static void main(String[] args) {
        ItemStack empty = null;
        ItemStack itemStack = new ItemStack(Material.APPLE);
        String item = convertItemToString(itemStack.clone());
        System.out.print("" + item);
        empty = readItemString(item);
        System.out.print("" + empty.getAmount() + " , " + empty.getType());
    }
   
    public static String convertItemToString(ItemStack i) {
        String name = "%" + i.getType() + "~" + i.getAmount() + "~";
        if(i.hasItemMeta()){
            if(i.getItemMeta().hasDisplayName()) {
                name += (i.getItemMeta().getDisplayName() + "~");
            }
            else {
                name += "null~";
            }
            if(i.getItemMeta().hasLore()) {
                name += (i.getItemMeta().getLore().get(0) + "~");
            }
            else {
                name += "null~";
            }
        }
        else {
            name += "null~null~";
        }
        if(i.getEnchantments().size()>0) {
            for(Enchantment e : i.getEnchantments().keySet()) {
                int power = i.getEnchantments().get(e);
                name += (e.getName() + "*" + power);
            }
        }
        return name;
    }
   

However, when I run it, this error is the result and I can't figure out why...

Code (Text):

Exception in thread "main" java.lang.NullPointerException
    at org.bukkit.Bukkit.getItemFactory(Bukkit.java:1113)
    at org.bukkit.inventory.ItemStack.hasItemMeta(ItemStack.java:540)
    at vanillaamplified.main.MainTesting.convertItemToString(MainTesting.java:25)
    at vanillaamplified.main.MainTesting.main(MainTesting.java:17)
 

This is the line where it is saying the error is happening:

Code (Text):

  if(i.hasItemMeta()){

Please help me before I go insane.

 

Oh, alright, thought it was possible to test things in the main method before going to the server but I guessed wrong. Thanks for the help.

 

Yeah, I was going to do this at first but I ran into some issues with using it so I was just making a simple version for myself. I'm mostly just writing this for something I'll use once so efficiency isn't a priority..... yet.