I am damaging my item when crafting and the damage indicator is not updating until it happens again.

 

Is there a method that I can call to force a damage indicator update?

That's just how Minecraft was made. You can see this happening when you use an undamaged diamond pickaxe that's enchanted with Unbreaking.

I am damaging my item when crafting and the damage indicator is not updating until it happens again.

 

Is there a method that I can call to force a damage indicator update?

Without your code we cannot see if you are doing anything wrong.

Setting amount stored:

                    		itemStack.stackTagCompound.setInteger("amount", this.maxStored);

And get damage:

    @Override
    public int getDamage(ItemStack itemStack)
    {
    	if (isValid(itemStack, "amount") && isValid(itemStack, "name")) {
		int stored = itemStack.stackTagCompound.getInteger("amount");
		if (itemStack.stackTagCompound.getString("name").length() != 0) {
          			return (this.maxStored-stored);
         		}
    	       } 
    	return 0;
    }

 

where isValid returns true if item has Nbt and the tag in question exists.

getDamage is called every tick I have the item shown in an itemSlot. (Checked with prints)

Is it not stored in the item nbt part of the players inventory when saved?

 

Also, showDurabilityBar and showDurabilityBar don't exist for items as a variable or a method.

After updating and creating these methods you suggested, it works!

 

Also, why is it bad to have a key called amount stored in an item?

But it shouldn't because the itemstack for my item and the other one is stored in a seperate part of the file... (For vanilla at least because I did some work with an out of game map editor)

no, I don't 

So you mean that it might confilct with base itemstack nbt changes