Backpack plugin bug...

Everytime i try to use my event it gives me this error :

[10:07:56] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to Backpacks v1.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.craftbukkit.v1_8_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:227) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.craftbukkit.v1_8_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:194) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at org.bukkit.craftbukkit.v1_8_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:190) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:692) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_40]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_40]
at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:710) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_40]
Caused by: java.lang.NullPointerException
at me.vhbob.backpacks.back.openBP(back.java:28) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_40]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
... 18 more


[/QUOTE] My code is :

Code:

package me.vhbob.backpacks;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class back extends JavaPlugin implements Listener {

    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void openBP(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        if (e.getAction().equals(Action.RIGHT_CLICK_AIR)
                || e.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
            if (p.getItemInHand().getType().equals(Material.CHEST)) {
                Inventory inv = Bukkit.getServer().createInventory(p, 27, "Small Backpack");  
                for (String slot : getConfig().getConfigurationSection("Backpack." + p.getName()).getKeys(false)) {
                    ItemStack item = getConfig().getItemStack("Backpack." + p.getName() + "." + slot);
                    inv.addItem(item);
                }
                p.openInventory(inv);
            }
        }
    }
  
    @EventHandler
    public void save(InventoryCloseEvent e){
        if (e.getInventory().getTitle().equalsIgnoreCase("Small Backpack")) {
            Player p = (Player) e.getPlayer();
            for (int i = 0; i < e.getInventory().getSize(); i++) {
                getConfig().set("Backpack." + p.getName() + "." + i, e.getInventory().getItem(i));
                saveConfig();
            }
        }
    }

please help

 

@vhbob Your error line is:

Code:

for (String slot : getConfig().getConfigurationSection("Backpack." + p.getName()).getKeys(false))

and you have a NullPointerException.

Is the Configuration Section null? Is player null?

 

Nevermind, i fixed it but the items dont load, heres the code @BrickBoy55 :

Code:

package me.vhbob.backpacks;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class back extends JavaPlugin implements Listener {

    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void openBP(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        if (e.getAction().equals(Action.RIGHT_CLICK_AIR)
                || e.getAction().equals(Action.RIGHT_CLICK_BLOCK)) {
            if (p.getItemInHand().getType().equals(Material.CHEST)) {
                Inventory inv = Bukkit.getServer().createInventory(p, 27,
                        "Small Backpack");
                if (getConfig().contains(p.getName())) {
                    for (String slot : getConfig().getConfigurationSection(
                            "Backpack." + p.getName()).getKeys(false)) {
                        ItemStack item = getConfig().getItemStack(
                                "Backpack." + p.getName() + "." + slot);
                        inv.addItem(item);
                    }
                    p.openInventory(inv);
                } else {
                    p.openInventory(inv);
                }
            }
        }
    }

    @EventHandler
    public void save(InventoryCloseEvent e) {
        if (e.getInventory().getTitle().equalsIgnoreCase("Small Backpack")) {
            Player p = (Player) e.getPlayer();
            for (int i = 0; i < e.getInventory().getSize(); i++) {
                getConfig().set("Backpack." + p.getName() + "." + i,
                        e.getInventory().getItem(i));
                saveConfig();
            }
        }
    }

}

and heres the config :

Code:

Backpack:
  vhbob:
    '0':
      ==: org.bukkit.inventory.ItemStack
      type: SAND
    '1':
      ==: org.bukkit.inventory.ItemStack
      type: GRASS
    '2':
      ==: org.bukkit.inventory.ItemStack
      type: STONE
    '3':
      ==: org.bukkit.inventory.ItemStack
      type: DIRT

the item stacks dont load at all

 

@vhbob Try setting how much of the ItemStack there is.

 

@BrickBoy55 heres the config, the problomes in the code i think, it cant find an item stack in

 

@vhbob I don't know, but you could try a for loop starting at 0, and increasing to your inventory size, it can get the values and add it then it will keep repeating to add the items. It probably isn't that most efficient way, so you should try finding someone more experienced than me.

 

@BrickBoy55 ok