SceneSupport.getScene(JComponent):Scene method should be added to obtain a scene instance from a JComponent that
represents a scene main or side view.

As a workaround, please, add following code into SceneSupport file in "widget" package manually:
public class SceneSupport {
  public static Scene getSceneForComponent (Component component) {
    if (component instanceof SceneComponent) {
      return ((SceneComponent) component).getScene ();
    return null;
  }
}
Also as a temporary workaround you may use java-reflection:
        JComponent view = ...;// scene.createView ();
        Field field = view.getClass ().getDeclaredField ("scene");
        field.setAccessible (true);
        System.out.println ("field.get (view) = " + field.get (view));