Ubuntu icon not appearing on dock for JavaFX apps about jdeploy HOT 7 CLOSED

Speculation: JavaFX might need to set the icon for the stage.
https://stackoverflow.com/questions/10121991/javafx-application-icon

E.g. Perhaps, in the absence of setting the stage icon explicitly, it is defaulting to no icon -- or perhaps it tries to extract the icon from the binary launcher, but there is no icon there.

So two possible workarounds if this hypothesis is correct:

1. Find a way to embed icon into binary in form that JavaFX can deal with.
2. Explicitly set stage icon in app.

Again... this is only speculation... need to run some tests to find out.

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Experiment 1: Tried running using java directly:
java -jar jfxcentral-1.0.jar

Got same result: Taskbar icon is blank.

I was using the same Azul jre17+fx distribution for this test.

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I have confirmed that adding an icon to the stage explicitly will work around this issue, and display the icon correctly on Ubuntu.

See the ensemble8 demo for an example.

Not sure if this is a bug in JavaFX, or the Azul distributions yet, or if this is expected behaviour. Also don't know if there is a way to provide a default icon using System properties.

@dlemmermann Do you know if there is a system property available to set the default Stage icon? I haven't been able to find anything.

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No, I do not think there is one. You have to add it to the stage via API. However, there is a known issue: https://bugs.openjdk.java.net/browse/JDK-8204936

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Looks like it is not 100% reliable.

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For now, then, the best I can do is add this to the documentation, and perhaps add a notice in the jdeploy GUI when you add an icon to point you to the workaround.

It is possible that this is Azul-specific, and that it could be resolved by switching to another distribution. I plan to add support for other distributions anyways, but Azul is nice because they provide the jre+fx and jdk+fx distros, which I haven't seen anywhere else - i.e. I'll have to roll my own JavaFX solution.

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I've added a note about this in the developer guide.

NOTE: If you are using JavaFX you should also add your icon to your app's Stage using stage.getIcons().add(...) as there is a https://github.com/shannah/jdeploy/issues/53[bug] in Ubuntu that will cause the app's icon to appear blank in the taskbar otherwise.

I'm going to close this issue as I don't think there's much that can be done here.

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