Trying to add words to a config file, not working with no errors?

Hi, I'm trying to make it so when people run a command, it will add the second argument (/<command> <1st> <2nd>) to a config.yml. However, I'm stumped on how to do this. Console gives me no errors nor does eclipse. Any help will be appreciated.

Code:

package me.rf2minecraft.CursePrevention;
 
import java.util.List;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.EventPriority;
 
public final class CursePrevention extends JavaPlugin implements Listener {
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        this.saveDefaultConfig();
        this.getConfig();
    }
   
    public boolean onCommand(CommandSender cmdsender, Command cmd, String cmdlabel, String[] args) {
       
        if(!(cmdsender instanceof Player)) {
            cmdsender.sendMessage(ChatColor.GOLD + "CursePrevention commands can only be run by an online player.");
        } else {
        if(cmdlabel.equalsIgnoreCase("curseprevention")) {
            if(args.length == 0) {
                cmdsender.sendMessage(ChatColor.GOLD + "CursePrevention");
                cmdsender.sendMessage(ChatColor.GOLD + "Author: RobloxianFire2");
                cmdsender.sendMessage(ChatColor.GOLD + "Version: 1.0");
                cmdsender.sendMessage(ChatColor.GOLD + "Commands: /curseprevention commands");
            }
            if(args.length == 1) {
                if(cmdsender.hasPermission("curseprevention.commands.view")) { // If player has permission to view the commands list.
                if(args[0].equalsIgnoreCase("commands")) {
                    cmdsender.sendMessage(ChatColor.GOLD + "######################################");
                    cmdsender.sendMessage(ChatColor.GOLD + "Commands: /curseprevention commands");
                    cmdsender.sendMessage(ChatColor.GOLD + "List Censors: /curseprevention list");
                    cmdsender.sendMessage(ChatColor.GOLD + "Reload: /curseprevention reload");
                }
            }
                if(cmdsender.hasPermission("curseprevention.list")) { // If player has permission to view the censored words list.
                    if(args[0].equalsIgnoreCase("list")) {
                        cmdsender.sendMessage(ChatColor.GOLD + "Banned Words: " + getConfig().getStringList("censoredwords"));
                    }
                }
                if(cmdsender.hasPermission("curseprevention.reload")) { // If player has permission to reload.
                    if(args[0].equalsIgnoreCase("reload")) {
                        getConfig().addDefault("censoredwords", getConfig().getStringList("censoredwords"));
                        getConfig().options().copyDefaults(true);
                        this.reloadConfig();
                        cmdsender.sendMessage(ChatColor.GOLD + "CursePrevention has been reloaded!");
                        }
                    }
                if(cmdsender.hasPermission("curseprevention.filter.add")) { // If player has permission to add words to filter.
                    if(args[0].equalsIgnoreCase("add")) {
                        if(args[1] == null) {
                            cmdsender.sendMessage(ChatColor.GOLD + "You need to provide a word to filter.");
                            cmdsender.sendMessage(ChatColor.DARK_RED + "Correct Usage: /curseprevention add <word>");
                        } else {
                            List<String> filteredwords = getConfig().getStringList("censoredwords");
                            if(!filteredwords.contains(args[1])) {
                                filteredwords.add(args[1]);
                                getConfig().addDefault("censoredwords", getConfig().getStringList("censoredwords"));
                                cmdsender.sendMessage(ChatColor.GOLD + "Word has been filtered!");
                                this.saveConfig();
                            } else {
                                cmdsender.sendMessage(ChatColor.GOLD + "Word was already filtered!");
                            }
                        }
                    }
                }
                }
            }
        }
return true;
}
    @EventHandler(priority = EventPriority.HIGH)
    public final void onPlayerChat(AsyncPlayerChatEvent event) {
        for(String word : event.getMessage().split(" ")) {
            if(getConfig().getStringList("censoredwords").contains(word)) {
                    if(!(event.getPlayer().hasPermission("curseprevention.bypass"))) { // If player has permission to bypass the censor.
                    event.setMessage(event.getMessage().replace(word, "****"));
            } else {
                event.setMessage(event.getMessage().replace(event.getMessage(), event.getMessage()));
                    }
                }
            }
        }
    }

Any help? ;/

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

 

Code:java

getConfig().addDefault("censoredwords", getConfig().getStringList("censoredwords"));

What is this supposed to do?

Try this instead:

Code:java

getConfig().set("censoredwords", filteredwords);