Error with string and integers

Code:

public class CreateRequest implements Listener {
  
    public GrandMinechange main; //initialize the main variable as Type main class
    public CreateRequest(GrandMinechange plugin) {
        this.main = plugin; //set it equal to an instance of main
    }
  
    public Inventory createInventory() {
      
      
        Inventory crinv = Bukkit.getServer().createInventory(null, 54, ChatColor.GREEN + "Create A Request");
      
      
        ItemStack reqstack = new ItemStack(Material.BLACK_CONCRETE, 1);
        ItemMeta reqmeta = reqstack.getItemMeta();
        reqmeta.setDisplayName(ChatColor.GREEN.toString() + ChatColor.BOLD.toString() + "Drag Desired Item Here"); //Placeholder item
        reqstack.setItemMeta(reqmeta);
        crinv.setItem(13, reqstack);
      
      
        (LINE 34) -> System.out.println(main.maxRequestAmount());
        List<String> lore = Arrays.asList(ChatColor.YELLOW.toString() + "Maximum is ".toString());

error:

Code:

[19:05:05 ERROR]: Could not pass event InventoryClickEvent to TheGrandMinechange v1.0.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.13.2.jar:git-Paper-448]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.13.2.jar:git-Paper-448]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.13.2.jar:git-Paper-448]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:2280) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:33) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:10) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:12) ~[patched_1.13.2.jar:git-Paper-448]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_191]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_191]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:109) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1016) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:943) ~[patched_1.13.2.jar:git-Paper-448]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:841) ~[patched_1.13.2.jar:git-Paper-448]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.lang.NullPointerException
        at me.Darkolythe.GrandMinechange.CreateRequest.createInventory(CreateRequest.java:34) ~[?:?]
        at me.Darkolythe.GrandMinechange.Menu.onInventoryClick(Menu.java:63) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor141.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.13.2.jar:git-Paper-448]
        ... 15 more

 

in main:

Code:

public class GrandMinechange extends JavaPlugin {

    public String prefix = new String(ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "[" + ChatColor.BLUE.toString() + "Minechange" + ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "] ");
    public HashMap<UUID, Long> cooldown = new HashMap<UUID, Long>();
   
    public static GrandMinechange plugin;
    public Menu menu = new Menu(this); //get the Menu class
    public CreateRequest createrequest = new CreateRequest(this);
    public int maxrequestamount = getConfig().getInt("maxrequestamount");

 

move them there and keep them there right?

Code:

public class GrandMinechange extends JavaPlugin {

    public String prefix = new String(ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "[" + ChatColor.BLUE.toString() + "Minechange" + ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "] ");
    public HashMap<UUID, Long> cooldown = new HashMap<UUID, Long>();
   
    public static GrandMinechange plugin;
    public Menu menu = new Menu(this); //get the Menu class
    public CreateRequest createrequest = new CreateRequest(this);
    public int maxrequestamount = getConfig().getInt("maxrequestamount");
   
    @Override
    public void onEnable() {
        menu = new Menu(this); //get other classes
        plugin = this;
       
        Menu menu = new Menu(this); //get the Menu class
        CreateRequest createrequest = new CreateRequest(this);
        maxrequestamount = getConfig().getInt("maxrequestamount");
       
        getServer().getPluginManager().registerEvents(menu, this); //register events from other classes
        getServer().getPluginManager().registerEvents(createrequest, this);
        getCommand("minechange").setExecutor(new MinechangeCommand());
       
        getConfig().addDefault("maxrequestamount", 10000);
        getConfig().options().copyDefaults(true);
        saveConfig();
       
        System.out.println(prefix + ChatColor.GREEN + "The Grand Minechange Enabled!");
    }

 

doing this is still causing errors

Code:

public class GrandMinechange extends JavaPlugin {

    public String prefix = new String(ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "[" + ChatColor.BLUE.toString() + "Minechange" + ChatColor.WHITE.toString() + ChatColor.BOLD.toString() + "] ");
    public HashMap<UUID, Long> cooldown = new HashMap<UUID, Long>();
 
    public static GrandMinechange plugin;
    public Menu menu;
    public CreateRequest createrequest;
    public int maxrequestamount;
 
    @Override
    public void onEnable() {
        menu = new Menu(this); //get other classes
        plugin = this;
     
        getConfig().addDefault("maxrequestamount", 10000); //if this value is missing from the config, it will put it back
        getConfig().options().copyDefaults(true);
        saveConfig();
     
        maxrequestamount = getConfig().getInt("maxrequestamount");
        menu = new Menu(plugin); //get the Menu class
        createrequest = new CreateRequest(plugin);
     
        getServer().getPluginManager().registerEvents(menu, this); //register events from other classes
        getServer().getPluginManager().registerEvents(createrequest, this);
        getCommand("minechange").setExecutor(new MinechangeCommand());
     
        System.out.println(prefix + ChatColor.GREEN + "The Grand Minechange Enabled!");
    }

the weird thing, is that main.maxrequestamount is accessible in CreateRequest, just not in that method.
It's accessible in both event handlers

 

@thechrisanator What are the errors? Would probably help more knowing that.

 

@thechrisanator
I may have a feeling that possibly it's picking up "main" as null.

1. Try removing the construct from CreateRequest class and follow the next steps.
2. Create a static getInstance() returning your plugin variable in your main class.
3. In CreateRequest, change "public GrandMinechange main;" to "public GrandMinechange main = GrandMinechange.getInstance();"
4. Try adding another variable to your CreateRequest class with the maxrequestamount as a variable and add it to your existing constructor. Looking like:
   
   Code:

    public GrandMinechange main; //initialize the main variable as Type main class
   public int maxrequestamount;
       public CreateRequest(GrandMinechange plugin,int maxrequests) {
           this.main = plugin; //set it equal to an instance of main
           this.maxrequestamount = maxrequests; //set it equal to amount of maxrequests
       }

If nothing works;

1. Try debugging your code, such as looking for errors or misplaced code or undefined variables or variables that can't be used
2. Make sure that everything is being set upon enable