Development Assistance Command not working

Hi,
I am making a plugin that handles chat channels (and don't just say "x plugin already does that". I know there are plugins that do this. I just wanted to do it to learn HashMaps and onCommand()). However, it will only show the usage when I use the command (which implies that yes, I have registered it in plugin.yml). I put it in an event when it was less developed, and it indicated that I had an NPE. I have changed my code since then, though. I still believe that my problem is an NPE. I believe it is a problem with the getConfig() statements, as it isn't printing the channelAmount int when programmed to.

Code:

package com.gmail.nlspector.chatchannels;

import java.util.HashMap;
import java.util.Map;

import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

public class ChatChannel extends JavaPlugin implements Listener {

    int i = 1;
    int channelAmount;
    String channelNames;
    @Override
    public void onEnable(){
        getLogger().info("Cool! You are using ChatChannels");
        getServer().getPluginManager().registerEvents(this, this);
        saveDefaultConfig();
        getConfig();
        channelAmount = getConfig().getInt("amount");
    }
   
    public Map<String, String> playerChannel = new HashMap<>();
   
    public boolean onCommand(Command cmd, CommandSender sender, String label, String[] args){
        if(cmd.getName().equalsIgnoreCase("channel")){
            try {
            if(sender instanceof Player){
                if(args.length != 0){   
                    String selectedChannel = args[0];
                    for(i = 1; i < (channelAmount + 1); i = i + 1){
                        String thisLoopChannel = this.getConfig().getString("channels." + Integer.toString(i));
                        if(selectedChannel.equals(thisLoopChannel)){
                            String switchedPlayer = sender.getName();
                            playerChannel.put(switchedPlayer, selectedChannel);
                            sender.sendMessage("You have been switched to the" + selectedChannel + "channel");
                            return true;
                        } else if(i == channelAmount){
                            sender.sendMessage("That isn't a channel!");
                        }
                    }
                } else {
                    sender.sendMessage("Too little arguments!");
                }
            }
            } catch (Exception e){
                getLogger().severe(e.getMessage());
            }
        }        
        return false;
    }
   
}

 

Is there a stack-trace?

 

There is no stack-trace, which is why I posted this here.
@HeadGam3z

Found the problem. Apparently I messed up the onCommand:

Code:

public void onCommand(Command cmd, CommandSender sender, String label, String[] args){
//some code here
}

should have been:

Code:

@Override
public void onCommand(CommandSender sender, Command cmd, String label, String[] args){
//some code here
}

*facepalm*

EDIT by Moderator: merged posts, please use the edit button instead of double posting.