Solved Problem with commands

I'm creating a faction Plugin with Spigot, but commands I created don't work. I'm explaining how: I created the commands /f, /f create and /f invite. When I type /f in game, the game send me a text who says "/f" and stop, it doesn't do what I wrote on the code... could you please help me?

Main class

Code:

 
package it.ss.factionplugin.koyote;

import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class NewFactions extends JavaPlugin {
    NewFactions instance;
    @Override
    public void onEnable(){
        instance = this;
        loadConfig();
        registerCommands();
    }
   
    @Override
    public void onDisable() {
       
    }
   
   
    private void loadConfig() {
        getConfig().options().copyDefaults(true);
        saveConfig();
    }
   
    private void registerCommands() {
        instance.getCommand("f").setExecutor(new cmds());
    }
   
    public boolean isPlayerOnline(String player) {
        for(Player tmp: this.getServer().getOnlinePlayers()) {
            if(tmp.getName().equals(player)) {return true; }
        }
        return false;
    }
   
    public Player getInstancePlayer(String player) {
        for(Player tmp: this.getServer().getOnlinePlayers()) {
            if(tmp.getName().equals(player)) {
                return tmp;
            }
        } return null;
    }
   
    } 

Class for the commands

Code:

 
package it.ss.factionplugin.koyote;

import org.bukkit.Color;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

 public class cmds implements CommandExecutor{
    private NewFactions plugin = new NewFactions();
    private Factions faction = new Factions();
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(args.length == 0) {                                      // Se il comando non ha parametri
            sender.sendMessage(Color.BLUE+ "Scegli un comando valido");
            return true;
        } else if(label.equalsIgnoreCase("f") ) {// Al comando /f
                 if(args[0].equalsIgnoreCase("create")) { // Se il comando ha il 1° parametro "create" ( creare fazione )
                    if(args.length!=2) {            // Se il player NON ha inserito il nome della fazione
                        sender.sendMessage(Color.BLUE + "Sintassi: /f create Fazione");
                        return true;
                    } else {        //Se il player ha inserito il nome della fazione
                        if(!faction.checkName(args[1])) {
                            faction.createFaction(args[1], sender.getName());
                            sender.sendMessage(Color.GREEN + "Fazione " + Color.BLUE + args[1] + Color.GREEN + " creata con successo!");
                            return true;
                        } else {
                            sender.sendMessage(Color.RED + "Nome già in uso!");
                        }
                    }
                } else if(args[0].equalsIgnoreCase("invite")) { //Se il 1° parametro è invite ( Invitare player )
                    if(args.length != 2) {
                        sender.sendMessage(Color.WHITE + "Sintassi: " + Color.RED + "/f" + Color.BLUE + " invite" + Color.ORANGE + " [Nome Player] ");
                        return true;
                    } else {
                        if(plugin.isPlayerOnline(args[1])) { 
                        Player reciver = plugin.getInstancePlayer(args[1]);
                        String fazione = faction.getFaction(sender.getName());
                        reciver.sendMessage(Color.GREEN + "Sei stato invitato ad entrare nella fazione: " + Color.WHITE + fazione + Color.GREEN + "\nDigita /f join " + Color.WHITE + fazione + Color.WHITE + " per accettare l'invito");
                        sender.sendMessage(Color.LIME + args[1] + Color.GREEN + " invitato."); 
                        return true;
                        } else {
                            sender.sendMessage(Color.RED + "Il player non è online!");
                            return true;
                        }
                    }
                } else if(args[0].equalsIgnoreCase("join")) {
                    if(args.length != 2) {
                        sender.sendMessage(Color.BLUE + "Sintassi: /f join [Nome Fazione]");
                    } else {
                       
                    }
                } return false;
            } return false;
    }
} 

(Useless for the thread) Class for helping me in Faction files

Code:

 
package it.ss.factionplugin.koyote;

import org.bukkit.entity.Player;

public class Factions {
    NewFactions plugin = new NewFactions();
    private String fazione;
    private int c;
   
    public void createFaction(String name,String owner) {
        this.fazione=name;
        c = (int) plugin.getConfig().get("NFactions") + 1;
        plugin.getConfig().set("Fazioni." + c , fazione);
        plugin.getConfig().set("Fazioni." + c + "." + fazione + ".capo_", owner);
        plugin.getConfig().set("NFactions", c);
        plugin.saveConfig();
    }
   
    public void addMember(Player player, String fazione) {
        plugin.getConfig().set("Fazioni." + fazione , player.getName());
        plugin.saveConfig();
    }
   
    public String getFaction(String owner) {
        int c,i;
        String nomeFazione;
        c=  plugin.getConfig().getInt("NFactions");
        for(i=0;i<=c;i++) {
            nomeFazione = (String) plugin.getConfig().get("Fazioni."+ i);
            if(plugin.getConfig().get("Fazioni." + i + "." + nomeFazione + ".capo_").equals(owner)) {
                return nomeFazione;
            }
        } return null;
    }
   
    public boolean checkName(String name) {
        int c, i;
        c= plugin.getConfig().getInt("NFactions");
        for(i=0;i<=c;i++) {
            if(plugin.getConfig().get("Fazioni." + i).equals(name)) {
                return true;
            }
        }
        return false;
    }
}
 

YML File

Code:

 
name: NewFactions
author: Koyote_059
version: 1.0
description: plugin
main: it.ss.factionplugin.koyote.NewFactions
commands:
    f: 
        description: Fazioni
        usage: /<command> 
        permission: <command>.perm
        permission-message: You don't have <command>.perm 

 

https://pastebin.com/9Yqy3t0a
That's it

 

Neither the main class? It can't extends JavaPlugin?

 

Oh i got it, now i'm trying... but sincerely i can't understand why I can't create Objects of the main class... Sorry i'm a bit noob in this.

 

Ok got it, you're right Thank you.
Could you do an example if it's not a problem? Just to be sure, sorry for bothering you.
I tryed to do this but it still doesn't work:

on main class:
private static NameMainClass plugin;
onEnable(){
plugin=this;
}

Then i set every method used in other classes static... but it doesn't work...

 

Ok no i solved, I missed an instance in a class, now it works... thank you!