import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.stage.Stage;

public class SplitPaneDemo extends Application{
    
    @Override public void start(Stage primaryStage) {

        SplitPane split = new SplitPane();
        Label label = new Label("test");
        split.getItems().add(label);
        split.getItems().remove(label);
        System.out.println("The value is: " + label.getParent() + " (should be NULL)");
        Scene scene = new Scene(label); // exception because parent is not null
    }
    
    public static void main(String[] args) {
        Application.launch(args);
    }
}