Custom inventory items not being set

I am trying to loop through a HashMap of classes, and get the itemstack, and set that itemstack in the inventory. Here is what I have:

Code:java

 @EventHandler
public void onInteractShopBook(PlayerInteractEvent e) {
Player p = e.getPlayer();
if (p.getItemInHand() == null) return;
if (plugin.playersInGame.contains(p.getName())) return;
if (!p.getItemInHand().equals(plugin.classesdata.kitpvpclassshop)) return;
if (e.getAction() == Action.LEFT_CLICK_AIR) return;
if (e.getAction() == Action.LEFT_CLICK_BLOCK) return;
e.setCancelled(true);
Inventory cmdBook = Bukkit.createInventory(null, 9, plugin.config.classSaleBookInvName);
 
int classBookAmount = 0;
for (String classK : plugin.classes.keySet()) {
ClassAPI shopItem = plugin.classes.get(classK);
if (shopItem.disabled == true) {
cmdBook = plugin.inventorymethods.addItem(shopItem.shopItemStackDisabled, cmdBook, classBookAmount);
classBookAmount++;
continue;
} else if (plugin.classmethods.playerHasClass(p, classK)) {
cmdBook = plugin.inventorymethods.addItem(shopItem.shopItemStackAlreadyBought, cmdBook, classBookAmount);
classBookAmount++;
continue;
}
cmdBook = plugin.inventorymethods.addItem(shopItem.shopItemStack, cmdBook, classBookAmount);
classBookAmount++;
}
p.openInventory(cmdBook);
}

Now, if the class is disabled, it returns a disabled itemstack. If the player already has the class, it returns the "already have that class" itemstack.

But when I attempt to open the class, I just get an empty class. The "classes" hashmap is not empty(checked with debug msgs) and it is in fact running the addItem method(also checked with debug messages). This is what the addItem method does:

Code:java

    public Inventory addItem(ItemStack superItem, Inventory inv,
            int loc) {
        inv.setItem(loc, superItem);
        return inv;
    }

What's going on?

 

Perhaps just setItems with cmdBook.setItem(Whatever here)? Perhaps constantly setting it = to something else is causing the issue. Any Log issues?