Removing items from a Bukkit Inventory

Question

I have a ItemStack, and I am trying to remove it from a player. I tried this successfully before, but now; I have no luck. I tried:

player.remove(new ItemStack(Material.COAL, 2));

And I have also tried to do this:

ItemStack itemStack = new ItemStack(Material.COAL);
player.remove(itemStack);

Answer 1

I found the solution and this static method does it wonderfully.

public static void removeInventoryItems(PlayerInventory inv, Material type, int amount) {
    for (ItemStack is : inv.getContents()) {
        if (is != null && is.getType() == type) {
            int newamount = is.getAmount() - amount;
            if (newamount > 0) {
                is.setAmount(newamount);
                break;
            } else {
                inv.remove(is);
                amount = -newamount;
                if (amount == 0) break;
            }
        }
    }
}