On Fri, 5 May 2023 08:46:03 GMT, Daniel <d...@openjdk.org> wrote: > Hi John, thank you for this information. I couldn't find any instances of > `ConcurrentModificationException`, but about an hour ago before the NPE, we > did have an `IllegalStateException`.
No, I don't think that is it. The check there prevented things from going wrong, and only alerted you that you were about to manipulate the SceneGraph on the wrong thread. These checks are not everywhere though, so there are many places where you can still change the SceneGraph without being alerted. ------------- PR Comment: https://git.openjdk.org/jfx/pull/1123#issuecomment-1535956787
