1.15.2 Error in console, not sure what is causing it

All the code is running properly but I kind of wanted to clear this error before adding more things. I have no idea what is causing it, however.

Code (Text):

[15:31:18 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'restoredrops' in plugin OrganizedDeathDrops v1.0-SNAPSHOT
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.15.1.jar:git-Paper-58]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.15.1.jar:git-Paper-58]
        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:740) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1820) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1628) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.15.1.jar:git-Paper-58]        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.MinecraftServer.aZ(MinecraftServer.java:1037) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1030) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1014) ~[patched_1.15.1.jar:git-Paper-58]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:937) ~[patched_1.15.1.jar:git-Paper-58]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
Caused by: java.lang.NullPointerException
        at me.nurdco.organizeddeathdrops.OrganizedDeathDrops.restoreInventory(OrganizedDeathDrops.java:54) ~[?:?]
        at me.nurdco.organizeddeathdrops.commands.DropsCommand.onCommand(DropsCommand.java:29) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.15.1.jar:git-Paper-58]
        ... 17 more

 

@eXpresS
@Optic_Fusion1

Code (Java):

package me.nurdco.organizeddeathdrops;


import me.nurdco.organizeddeathdrops.commands.DropsCommand;
import me.nurdco.organizeddeathdrops.events.OnDeathEvent;
import net.md_5.bungee.api.chat.BaseComponent;
import net.md_5.bungee.api.chat.ClickEvent;
import net.md_5.bungee.api.chat.ComponentBuilder;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.inventory.meta.BookMeta;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public final class OrganizedDeathDrops extends JavaPlugin{

    ItemStack[] droppedItems;

    public Map<String, ItemStack[]> itemsMap = new HashMap<String, ItemStack[]>();
    public Map<String, ItemStack[]> armorMap = new HashMap<String, ItemStack[]>();
    public Map<List<String>, InventorySnapshot> individualBooks = new HashMap<java.util.List<String>, InventorySnapshot>();
    public float xp;
    private OnDeathEvent listener = null;

    @Override
    public void onEnable() {
        this.listener = new OnDeathEvent(this);
        System.out.println("[OrganizedDeathDrops] Starting...");
        getServer().getPluginManager().registerEvents(listener, this );
        getConfig().options().copyDefaults();
        saveDefaultConfig();
        getCommand("restoreDrops").setExecutor(new DropsCommand(this));
    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
        System.out.println("[OrganizedDeathDrops] Shutting down...");
    }

    public void restoreInventory(Player p, ItemStack[] invContents, ItemStack[] armorContents){
        PlayerInventory inventory = p.getInventory();

        ItemStack[] newInv;


        inventory.setContents(individualBooks.get(inventory.getItemInMainHand().getItemMeta().getLore()).contents);
        inventory.setArmorContents(individualBooks.get(inventory.getItemInMainHand().getItemMeta().getLore()).armor);
        individualBooks.remove(inventory.getItemInMainHand().getItemMeta().getLore());



       /* for (int i = 0; i < barrelCount; i++) {
            Barrel barrel = placeBarrel(player, i == 0 ? location : location.clone()
                    .add(0, i, 0));
            if (barrel == null) {
                // If barrel placement fails skip it. This can lead to not all drops being processed.
                // Remaining items not stored in barrels will be dropped on the floor.
                break;
            }
            placedBarrelCount++;

            ItemStack[] dropPartition = new ItemStack[barrelCapacity];
            for (int j = 0; drops.size() > 0 && j < barrelCapacity; j++) {
                dropPartition[j] = drops.remove(0);
            }
            barrel.getInventory().setContents(dropPartition);
        }*/

    }

    public void storeContents(Player p, ItemStack[] items, ItemStack[] armor, float newXP) {
        itemsMap.put(p.getName(), items);
        armorMap.put(p.getName(), armor);
        xp = newXP;
    }

    public ItemStack createBook(UUID uuid, String name) {
        ItemStack book = new ItemStack(Material.WRITTEN_BOOK);
        BookMeta bookMeta = (BookMeta) book.getItemMeta();

        BaseComponent[] page = new ComponentBuilder("[Click here to restore dropped items]")
                .event(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/restoredrops"))
                .create();


        bookMeta.spigot().addPage(page);

        bookMeta.setTitle(name);
        bookMeta.setAuthor("OrganizedDeathDrops");
        book.setItemMeta(bookMeta);

        return book;
    }
}

 

Code (Java):

package me.nurdco.organizeddeathdrops.commands;

import me.nurdco.organizeddeathdrops.OrganizedDeathDrops;
import me.nurdco.organizeddeathdrops.events.OnDeathEvent;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;

public class DropsCommand implements CommandExecutor {

    private OrganizedDeathDrops main;

    public DropsCommand(OrganizedDeathDrops main) {
        this.main = main;
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {

        if(sender instanceof Player) {
            Player player = (Player) sender;
            if (command.getName().equalsIgnoreCase("restoreDrops")) {
                //Inventory droppedItems = Bukkit.createInventory(player, 45, "Dropped Items");
                //player.openInventory(droppedItems);
                main.restoreInventory(player, player.getInventory().getContents(), player.getInventory().getArmorContents());
                //return true;
            }
            if (command.getName().equalsIgnoreCase("debug")) {
                player.sendMessage(String.valueOf(main.itemsMap));
                player.sendMessage(String.valueOf(main.armorMap));
                return true;
            }

        } else {
            System.out.println(ChatColor.RED +"You need to be a player to execute this command.");
        }


        return true;
    }
}
 

Code (Java):

package me.nurdco.organizeddeathdrops.events;

import me.nurdco.organizeddeathdrops.InventorySnapshot;
import me.nurdco.organizeddeathdrops.OrganizedDeathDrops;
import org.bukkit.ChatColor;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.PlayerDeathEvent;
import org.bukkit.event.player.PlayerEggThrowEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

import java.util.Arrays;
import java.util.List;
import java.util.Random;

public class OnDeathEvent implements Listener {

    private OrganizedDeathDrops main = null;

    public ItemStack book = null;

    public InventorySnapshot invSnap;

    public OnDeathEvent(OrganizedDeathDrops main) {
        this.main = main;
    }

    @EventHandler
    public void onDeath(final PlayerDeathEvent e) {
        if(e.getEntity() instanceof Player) {
            final Player player =  (Player) e.getEntity();
            player.sendMessage("Death Detected");

            List<ItemStack> drops = e.getDrops();

            Random rand = new Random();
            int randomNum = (int) (Math.random() * 0 + 9999);
            player.sendMessage(String.valueOf(randomNum));

            book = main.createBook(player.getUniqueId(), player.getName());
            ItemMeta bookMeta = book.getItemMeta();
            bookMeta.setLore(Arrays.asList(ChatColor.RED + "- Only Works in MAIN HAND Slot -", ChatColor.DARK_GRAY + "Unique ID: " + String.valueOf(randomNum)));
            book.setItemMeta(bookMeta);
            player.sendMessage("LORE SET");

            player.getWorld().dropItemNaturally(player.getLocation(), book);

            invSnap = new InventorySnapshot();
            invSnap.contents = player.getInventory().getContents();
            invSnap.armor = player.getInventory().getArmorContents();
            invSnap.book = book;
            invSnap.player = player.getUniqueId();

            System.out.println(Arrays.toString(invSnap.contents));

            main.individualBooks.put(book.getItemMeta().getLore(), invSnap);

            //main.storeContents(player, player.getInventory().getContents(), player.getInventory().getArmorContents(), e.getNewExp());
            e.getDrops().clear();
        }
    }

    @EventHandler
    public void test(PlayerEggThrowEvent e) {
        System.out.println(invSnap);
        System.out.println(book);
    }
}
 

Code (Java):

package me.nurdco.organizeddeathdrops;

import org.bukkit.OfflinePlayer;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

import java.util.UUID;

public class InventorySnapshot {
    public ItemStack[] contents;
    public ItemStack[] armor;
    public ItemStack book;
    public UUID player;
}
 

 

Line 54 is

Code (Java):

        inventory.setArmorContents(individualBooks.get(inventory.getItemInMainHand().getItemMeta().getLore()).armor);
 

 

I changed it to this:

Code (Java):

        inventory
                .setContents(
                        individualBooks
                                .get(
                                        inventory
                                                .getItemInMainHand()
                                                .getItemMeta()
                                                .getLore())
                                .contents);
        inventory
                .setArmorContents(
                        individualBooks
                                .get(
                                        inventory
                                                .getItemInMainHand()
                                                .getItemMeta()
                                                .getLore())
                                .armor);
 

and now the error says it's on line 65, which is the .get( under the armor. I don't really understand how that is making an error though but the contents one isn't.