LoadException: Root value already specified on custom control
问题 Example below causes javafx.fxml.LoadException: Root value already specified. The code is written according to example here: http://docs.oracle.com/javafx/2/fxml_get_started/custom_control.htm Code: public class NavigationView extends ButtonBar { private static final String defaultTemplate = "/fxml/navigator.fxml"; public NavigationView() { this(null); } public NavigationView(URL resource) { //FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("custom_control.fxml")); if( resource