Any suggestions of ConcurrentModificationException?

[chengenzhao]

Hi:

We tried to create a mechanism that when we press Enter button then the input remove this trigger to have a one shot action,
so we write the code like this

var listener = new TriggerListener() {

      @Override
      protected void onActionBegin(Trigger trigger) {
        if(trigger instanceof KeyTrigger keyTrigger &&
          (keyTrigger.getKey() == KeyCode.SPACE || keyTrigger.getKey() == KeyCode.ENTER)){
          System.out.println("action fired");
          Platform.runLater(()->FXGL.getInput().removeTriggerListener(this));//without platform run later, this line will cause the concurrent modification exceptions, so better suggestions?
        }
      }
};
FXGL.getInput().addTriggerListener(listener);

We tried to remove the listener in the onAcionBegin method but got the exception,
so we use Platform run later method to queue up this lambda again
but not very sure this is the best practice or not
or did I miss some actions like action once or sth. similar?
Please let me know

Thanks

[chengenzhao]

I think it would be nice to have an OnceAction or ActionOnce
like

getInput().addOnceAction(...)
//or
getInput().addActionOnce(...)

The action will be triggered only once
and it will be removed once it finished its action body