public class PlayerOnJoin implements Listener {
    ZanderMain plugin;

    public PlayerOnJoin (ZanderMain instance) {
        plugin = instance;
    }

    @EventHandler
    public void onJoin(PlayerJoinEvent event) {
        Player player  = event.getPlayer();

        try {
            PreparedStatement preparedStatement = ZanderMain.getPlugin().getConnection.prepareStatement(
                "INSERT INTO " + ZanderMain.plugin.getConfig().getString("database.databasename") + " (uuid, username) VALUES (?, ?)"
            );
            preparedStatement.setString(1, player.getUniqueId().toString());
            preparedStatement.setString(2, player.getName());

            preparedStatement.executeUpdate();
            preparedStatement.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }