On Fri, 13 Aug 2021 12:29:06 GMT, Maxim Kartashev 
<github.com+28651297+mkartas...@openjdk.org> wrote:

>> oh you are getting metrics for a JFrame ? That's not going to exercise any 
>> new font code so is pointless except to make it so the test has to be 
>> headful.
>
> But `getFontMetrics()` is the primary "entry point" that generated all the 
> JNI warnings in the first place. And I'm also not sure that we could've 
> gotten all the warnings on Windows without `JFrame`.

So what's wrong with
g2d.setFont(font);
FontMetrics metrics = g2d.getFontMetrics(font);

?

No frame needed.

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PR: https://git.openjdk.java.net/jdk/pull/4572

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