Check how much of an item the player has in inventory

Hi i'm trying to find how many of a certain item the players has in their inventory. I got this code but it gives me a NullPointerException on the line 299 (in this case line 9 ):

Code:

if(Material.matchMaterial((String) listFind.get(index).get("type")) != null)
                        {
                            ItemStack it = new ItemStack(Material.matchMaterial((String) listFind.get(index).get("type")));
                            boolean isValide = false;
                            int ind = 0;
                            ItemStack[] inv = e.getPlayer().getInventory().getContents();
                            e.getPlayer().sendMessage("test");
                            for(int i = 0; i < e.getPlayer().getInventory().getSize(); i++) {
                                e.getPlayer().sendMessage(e.getPlayer().getInventory().getItem(i).getType().name()); // line 299
                                if(e.getPlayer().getInventory().getItem(i).getType().equals(it.getType()))
                                {
                                    isValide = true;
                                    ind = i;
                                }
                            }

i still have no idea why,
Thanks !

-Nic

 

What is line 299?

 

i wrote it in comment, it's the one that promp the item name to the player chat.,

 

Oops. sorry. Maybe getInventory doesn't have i.

 

.getInventory().getItem(i).getType().name()'

Is the Inventory null? is the item null? is the type null? is the name null?

You did not even check for any of those things. Why did you not check if any of these are null. You should always get into the habit of adding null checks.

 

As Zombie_Striker said just insert null checks, I think that empty slots returns null ItemStacks and that's why you get NullPointerException.

 

yea that was indeed the problem. I feel a bit bad right now, But thanks anyways it fixed my problem
have a nice day !

- Nic