Can not use my classes from other plugins

Hey,
I have a problem.

The plugin is running on a Spigot 1.14.4 server
I use the IntelliJ IDEA 2019.2.1 (Community Edition)

I created a plugin with some basic features.
And now I wand to access to it from a nother plugin.

I already did this cind of stuff in the past so I add the the .jar file as a new dictunary from my base plugin and I thought if should be fine?
The I go in the new plugin and imported the stuff from the base plugin.
That worked so far and I got no errors while building
now I started the server and get this error:

Error (open) Error (close)

java.lang.NullPointerException: null
at ...base.Utils.<init>(Utils.java:29) ~[?:?]
at ...chestlock.listener.BlockListener.<init>(BlockListener.java:14) ~[?:?]
at ...chestlock.Main.loadListener(Main.java:36) ~[?:?]
at ...chestlock.Main.onEnable(Main.java:21) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:352) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:461) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:375) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.reload(CraftServer.java:810) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.Bukkit.reload(Bukkit.java:576) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.dispatchCommand(CraftServer.java:710) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.dispatchServerCommand(CraftServer.java:695) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.DedicatedServer.handleCommandQueue(DedicatedServer.java:433) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:397) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:971) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:816) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]

Utils.java:29

Code:

private final File help = new File(plugin.getDataFolder().getPath(), "help.yml");

BlockListener.java:14

Code:

private Utils utils = new Utils(prefix);

so what can I do now and where is the issue?

 

At least post main.java class in chestlock line 21.

 

Ok at first thank you for replys.

My classes are looking like this:

Code:

import org.bukkit.plugin.java.JavaPlugin;
public class Main extends JavaPlugin {
private String prefix;
private static Main instance;

@Override
public void onEnable() {
  prefix = "§7[§dChestLock§7]: ";
  instance = this;
  loadListener(); // <-- line 21 in main
  Bukkit.getConsoleSender().sendMessage(prefix+"§aEnabled");
}

private void loadListener() {
  Bukkit.getPluginManager().registerEvents(new BlockListener(), this);
}
public String getPrefix() {
  return prefix;
}
private Main getInstance() {
  return instance;
}
}

Code:

import ...chestlock.Main;
import ...base.Utils;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
public class listenerChest implements Listener {
private Main plugin = Main.getInstance(); // I don't have to import the Main class because it is in the same package
private Utils utils = new Utils(plugin.getPrefix());

@EventHandler
public void onTest(BlockBreakEvent e) {
  e.setCancelled(true)
}
}

Code:

import ...base.Main;

public class Utils {
private final Main plugin = Main.getInstance();
private final String prefix;
private final File help = new File(plugin.getDataFolder().getPath(), "help.yml");
private final File player = new File(plugin.getDataFolder().getPath(), "player.yml");
private final File log = new File(plugin.getDataFolder().getPath(), "log.yml");
public Utils(String prefix) { this.prefix = prefix; }
}

That are the involved classes I think

 

Ok I now tryed to update my InteliJ but it still don't work
Now I just put the chestLock stuff in the core plugin... that worked but that is not a good solution because I want to make many plugins that all based of the core plugin instead of one big one

So thank you for the support till now I cind of solved the issue but I would be realy happy if someone can help me with this problem so I can make independent smal plugins that all just need the core plugin instead of one big one that have many features but not all needed...