(https://stackoverflow.com/questions/45440102/javafx-css-class-not-removed-when-node-disconnected)
I appeared to have discovered a case in JavaFX (8u144, running on Windows 7) where a TextField is rendered using the wrong style class. This only appears to happen in the following situation * style class removed whilst Node not attached to Scene AND * parent `GridPane` has a style-class assigned, even if that class doesn't have content. I've separated the issue from a larger application into the following contrived example: public class RenderBug extends Application { private static final String ERROR = "error"; public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) throws Exception { TextField field = new TextField(); GridPane grid = new GridPane(); grid.getStyleClass().add("some-random-class"); grid.add(field, 0, 0); StackPane stack = new StackPane(grid); Scene scene = new Scene(stack); scene.getStylesheets().add("/foo.css"); primaryStage.setWidth(300); primaryStage.setHeight(300); primaryStage.setScene(scene); primaryStage.show(); Timeline line = new Timeline(); line.getKeyFrames().add(new KeyFrame(Duration.seconds(4), event -> { field.getStyleClass().add(ERROR); })); line.getKeyFrames().add(new KeyFrame(Duration.seconds(5), event -> { stack.getChildren().remove(grid); })); line.getKeyFrames().add(new KeyFrame(Duration.seconds(6), event -> { field.getStyleClass().remove(ERROR); })); line.getKeyFrames().add(new KeyFrame(Duration.seconds(7), event -> { stack.getChildren().add(grid); System.out.println(field.getStyleClass()); })); line.play(); } } foo.css .text-field.error { -fx-background-color: red; } .some-random-class { /** no content required */ } Screenshot. At this point TextField is red, even though the class "error" has been removed. Even interacting with the field, resizing window etc. does not fix the issue. [![TextField shown with red][1]][1] Is this a genuine bug? or am I doing something wrong? I can't find any documentation to hint that style-classes cannot or shouldn't be updated "offline" [1]: https://i.stack.imgur.com/ZPEYi.png