Removing Item's From Player's Inventory Not Working

Hello, I am trying to make it so when a player buy a sword it remove money, and money is Nether Stars with a DisplayName, but when i buy the item it doesn't remove the Items/money from my inventory but i have a debug message and the debugmessage works please help.

Buying The Item Code:

Code:java

 
if (slot == 0){
if (money(player) >= 25){
             rmoney(player, 25);
player.closeInventory();
ItemStack is = new ItemStack(Material.DIAMOND_SWORD, 1);
   is.addEnchantment(Enchantment.DAMAGE_ALL, 1);
   player.getInventory().addItem(is);
             player.sendMessage("You Bought A Diamond Sword With Your Vote Coins");
} else {
           player.sendMessage("You don't have enough to buy this item.");
         }
   }
 

remove money method:

Code:java

 
 public void rmoney(Player player, int xam) {
   int rem = 0;
   for (ItemStack i : player.getInventory().getContents())
     if ((i != null) && 
       (i.getType() == Material.NETHER_STAR) && 
       (rem < xam))
       if (i.getAmount() >= xam) {
       player.sendMessage("Works!");
         rem = xam;
         i.setAmount(i.getAmount() - xam);
       } else {
         rem = i.getAmount();
         i.setType(Material.AIR);
       }
 }
 

Bump

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

 

Bump

 

Remove one from the players inventory each time and then update the inventory using: player.updateInventory();

 

No, but player.updateInventory(); is absolutely necessary and its stupidly deprecated but to avoid inventory glitches use it because bukkit has many inventory bugs that updateInventory fixes.