@WsSubscribe
public void handleRollFlierDice(WebSocket ws, RollFlierDiceMessage msg) {
if (!msg.getGameId().equals(game.getGameId())) throw new IllegalArgumentException("Invalid game id.");
if (!gameStarted) throw new IllegalArgumentException("Game is not started.");
broadcast(new FlierDiceMessage(msg.getGameId(),msg.getMeepleType(), 1+random.nextInt(3)));
}