Error: JavaFX runtime components are missing, and are required to run this application

[Mark Raynsford]

On 2018-10-13T19:46:34 +0200
Johan Vos <johan.vos at gluonhq.com> wrote:
>
> There are some workarounds (e.g. you can have a Main class that doesn't
> extend Application that calls your Application), but the best approach is
> go modular, as explained here:
> https://stackoverflow.com/questions/52467561/intellij-cant-recognize-javafx-11-with-openjdk-11/52470141#52470141
> 

The following appears to work: Given an unsurprising subclass of
Application:

public final class ExampleApplication extends Application
{
  private static final Logger LOG =
    Logger.getLogger(ExampleApplication.class.getCanonicalName());

  public ExampleApplication()
  {

  }

  @Override
  public void start(
    final Stage stage)
  {
    LOG.info("started");

    final Button button = new Button();
    button.setText("Click");

    final BorderPane pane = new BorderPane();
    pane.setCenter(button);

    final Scene scene = new Scene(pane, 640.0, 480.0);
    stage.setScene(scene);
    stage.setTitle("Example");
    stage.show();
  }
}

Then a main method that passes a class reference rather than allowing
the launcher to reflectively find the application:

public final class Main
{
  private Main()
  {

  }

  public static void main(
    final String[] args)
  {
    /*
     * Non-modular applications must specify the application class explicitly rather
     * than allowing the launcher to use reflection to try to instantiate and start
     * an application.
     */

    Application.launch(ExampleApplication.class, args);
  }
}

The application starts up and runs without issue.

-- 
Mark Raynsford | http://www.io7m.com