onPlayerJoin()

public void onPlayerJoin(PlayerJoinEvent event) {
        Player player = event.getPlayer();
        String playerName = player.getName();
        String s = plugin.playersMap.get(playerName);
        if (s != null) {
            String savedIP = s.split(":")[0];
            String playerIP = player.getAddress().getAddress().getHostAddress();
            if (!savedIP.equalsIgnoreCase(playerIP)) {
                plugin.notLoggedInList.add(playerName);
                player.sendMessage(plugin.HEADER + ChatColor.RED
                        + "Tapez \"/login <mdp>\" pour vous connecter !");
            } else {
                player.sendMessage(plugin.HEADER + ChatColor.GREEN
                        + "Bienvenue sur le serveur " + playerName + " !");
                player.sendMessage(plugin.HEADER + ChatColor.GREEN
                        + "Bienvenue sur le serveur " + playerName + " !");
                if (plugin.notLoggedInList.contains(playerName)) {
                    plugin.notLoggedInList.remove(playerName);
                }
            }
        } else {
            plugin.notLoggedInList.add(playerName);
            player.sendMessage(plugin.HEADER + ChatColor.RED
                    + "Tapez \"/register <mdp>\" pour vous enregistrer !");
        }
    }