===== CODE ====

public class ClanfigManager {
    private static PhantomClans plugin;
    public static List<String> PLAYERS = new ArrayList<String>();
    static {
        PLAYERS.add("ADD");
        PLAYERS.add("PLAYERS");
        PLAYERS.add("PLEASE");
    }

    public static void load(PhantomClans instance){
        plugin = instance;
        loadDefaults();
    }
    private static void loadDefaults(){
        for(Clan clan : ClanManager.getClans()){
            getPlayers(clan);
        }
        save();
    }

    public static void save(){
        plugin.clans.save();
    }

    // Y U NO WRITE TO FIRRRUUU?
    public static List<String> getPlayers(Clan clan){
        return plugin.clans.getStringList("clans." + clan.getName() + ".players",PLAYERS);
    }

    public static List<String> reloadPlayers(Clan clan){
        PLAYERS.clear();
        for(String player : clan.getPlayers()){
            PLAYERS.add(player);
        }
        save();
        return getPlayers(clan);
    }
}


==== RESULTING FILE OUTPUT ====
{}