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  1. JDK
  2. JDK-8226274

NPE in WinWindow.notifyMoving when Stage with no Scene is shown on 2nd monitor

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    • Subcomponent:
    • Introduced In Version:
      9
    • CPU:
      x86_64
    • OS:
      windows_10

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        Description

        I'm creating two stages, one as a child of the primary one. The child stage is given a Scene, but the parent isn't. I then move both stages to my second monitor programmatically.

        The bug occurs when I try to show the two Stages. Sample code and stack trace below. Uncommenting the "stage.setScene" line works around the problem.

        import javafx.application.Application;
        import javafx.geometry.Rectangle2D;
        import javafx.scene.Scene;
        import javafx.scene.control.Label;
        import javafx.stage.Screen;
        import javafx.stage.Stage;
        import javafx.stage.StageStyle;

        public class NotifyMovingBug extends Application {

          public static void main(String[] args) {
            Application.launch(args);
          }

          @Override
          public void start(Stage stage) throws Exception {
            Stage childStage = new Stage(StageStyle.TRANSPARENT);

            childStage.initOwner(stage);

            Screen screen = Screen.getScreens().stream()
              .filter(s -> !s.equals(Screen.getPrimary()))
              .findFirst()
              .orElseThrow(() -> new IllegalArgumentException("Must have two screens!"));

            setupStageLocation(stage, screen);
            setupStageLocation(childStage, screen);

            // stage.setScene(new Scene(new Label("Bla")));
            childStage.setScene(new Scene(new Label("Some text")));

            stage.show(); // <<<< NPE here
            childStage.show();
          }

          private static void setupStageLocation(Stage stage, Screen screen) {
            Rectangle2D bounds = screen.getBounds();

            stage.setX(bounds.getMinX());
            stage.setY(bounds.getMinY());
            stage.setWidth(bounds.getWidth());
            stage.setHeight(bounds.getHeight());
          }
        }

        Stack trace:

        Exception in Application start method
        java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
        Caused by: java.lang.RuntimeException: Exception in Application start method
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
        at java.base/java.lang.Thread.run(Thread.java:834)
        Caused by: java.lang.NullPointerException
        at javafx.graphics/com.sun.glass.ui.win.WinWindow.notifyMoving(WinWindow.java:205)
        at javafx.graphics/com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:129)
        at javafx.graphics/com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:336)
        at javafx.graphics/javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1550)
        at javafx.graphics/javafx.stage.Window.applyBounds(Window.java:1412)
        at javafx.graphics/javafx.stage.Window$12.invalidated(Window.java:1117)
        at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
        at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
        at javafx.graphics/javafx.stage.Window.setShowing(Window.java:1174)
        at javafx.graphics/javafx.stage.Window.show(Window.java:1189)
        at javafx.graphics/javafx.stage.Stage.show(Stage.java:273)
        at NotifyMovingBug.start(NotifyMovingBug.java:32)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
        ... 1 more
        Exception running application NotifyMovingBug

        The line of code where this fails in WinWindow is:

                            view.updateLocation();

        Where "view" is null.

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                Assignee:
                kcr Kevin Rushforth
                Reporter:
                jhendrikx John Hendrikx
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                  Updated:
                  Resolved: