private void startMessages() {
    Bukkit.getScheduler().runTaskTimer(this, new Runnable() {
        @Override
        public void run() {
            Bukkit.getOnlinePlayers().forEach(player -> sendBiome(player));
        }
    }, 1, 1);
}

private void sendBiome(Player player) {
    Biome biome = player.getLocation().getBlock().getBiome();
    player.spigot().sendMessage(ChatMessageType.ACTION_BAR,
            TextComponent.fromLegacyText("Biome: " + biome));
}