Rafa and Otis help

package me.bdogmbdev.src;

import java.util.List;
import java.util.Random;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class Censor extends JavaPlugin implements Listener {
    private Random rand;

    public void onEnable() {
        this.rand = new Random();
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        saveDefaultConfig();

    }

    @EventHandler
    public void onPlayerChat(AsyncPlayerChatEvent e) {
        List<String> badWords = getConfig().getStringList("words");
        List<String> fillers = getConfig().getStringList("fillers");
        for (String word : badWords){
                int randomIndex = rand.nextInt(fillers.size());
                String filler = fillers.get(randomIndex);
        if (e.getMessage().toLowerCase().contains(word)) {
                String newMessage = e.getMessage().toLowerCase().replace(word, filler);
                e.setMessage(newMessage);
                e.getPlayer().sendMessage(ChatColor.RED + "Please do not swear " + e.getPlayer().getName() + "!");
                e.setCancelled(false);
            }

        }

    }
}