Alerts in JavaFX – Icons don’t show up after exporting jar

Question

I’ve been trying to develop an application using Alerts, but after exporting the jar, the icon that should be displayed in the dialog, is gone:

When I start from Eclipse, the icon is shown:

What am I doing wrong? The code:

public class Main extends Application{
    @Override
    public void start(Stage primaryStage){
        Alert alert = new Alert(AlertType.CONFIRMATION);
        alert.show();
    } 

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

Edit: When starting from the command line, the following error is printed:

com.sun.javafx.css.StyleManager getCachedImage

WARNING: Error loading image: rsrc:dialog-confirm.png

I can’t figure out, why the image is (probably) missing.

You also have to export the images that you use in your application, for example by using a separate package below your src-folder. You also can manipulate your buildpath. See here: http://stackoverflow.com/questions/25635636/eclipse-exported-runnable-jar-not-showing-images — Supahupe, May 23 '16 at 15:19
Exporting standard JavaFX alert images with the application jar file shouldn't be necessary Supahupe. The standard JavaFX alert images ship with the Java runtime environment (Oracle JRE 8u40+). — jewelsea, May 23 '16 at 20:43
"after exporting the jar" <= How do you export the jar? Do you use e(fx)clipse tooling? Do you (mistakenly) try to include jfxrt.jar as a bundled resource with your jar distribution? Any idea where the "rsrc:" string (which I've never seen before) in your error message comes from? Do you have some kind of OSGi application or weird, custom class-loading solution? — jewelsea, May 23 '16 at 20:45

score 1 · Accepted Answer · answered May 25 '16 at 10:35

I used to export via File → Export → Java → Runnable JAR file. As jewelsea already wrote, the way of exporting it is important. Oracles documentation says, I should use Ant Tasks. After reproducing it with Eclipse, as described here, it worked.

I wasn't able to find a good explanation why this approach is necessary though.

Alerts in JavaFX – Icons don’t show up after exporting jar

1 Answers1