Why am I getting java.lang.IllegalStateException “Not on FX application thread” on JavaFX?
The user interface cannot be directly updated from a non-application thread. Instead, use Platform.runLater(), with the logic inside the Runnable object. For example: Platform.runLater(new Runnable() { @Override public void run() { // Update UI here. } }); As a lambda expression: // Avoid throwing IllegalStateException by running from a non-JavaFX thread. Platform.runLater( () -> { … Read more