Getting custom item display name not working

I have a piece of paper with a custom display name and I am trying to display that name (if it is in the player's hand, hence cursor) to the player with

human.sendMessage(ChatColor.BLUE+ cursor.getItemMeta().getDisplayName());

however, this just returns null

 

show your code or we can not do anything for you.

 

Code:

@EventHandler(priority = EventPriority.NORMAL)
    public void onInventoryClick(InventoryClickEvent event) {
        HumanEntity human = event.getWhoClicked();
        ItemStack current = event.getCurrentItem();
        ItemStack cursor = event.getCursor();

        if(human instanceof Player && event.getAction() == InventoryAction.SWAP_WITH_CURSOR) {
            if(cursor.getType() == Material.NETHER_STAR) {
                event.setCancelled(true);
            }
         
            if(current.getType() == Material.NETHER_STAR) {
       
               
                List<String> list = new ArrayList<String>();
                ItemMeta itemmeta = cursor.getItemMeta();
               
                human.sendMessage(ChatColor.BLUE+ itemmeta.getDisplayName());
               
                list.add("certificate");
                if(itemmeta.getDisplayName()=="police application"){
                    itemmeta.setDisplayName("poilce certificate");
                    itemmeta.setLore(list);
                    cursor.setItemMeta(itemmeta);

So basically this checks if the player has clicked on a nether star in a chest with an item, if the display name of the item is "police application" then I want to change the name, however it doesn't change the name even if it is the correct name.

 

You can not compare to Strings with ==. Use .equals (). AFAIK only Players can click so basically just get the player who clicked instead of HumanEntity