RFR: JDK-8276809: java/awt/font/JNICheck/FreeTypeScalerJNICheck.java shows JNI warning on Windows

[Matthias Baesken]

On Tue, 9 Nov 2021 20:51:30 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> Yeah this looks like the wrong fix.
>> -Xcheck:jni only warns like this if there are actual exceptions, doesn't it ?
>> So if we had one, where was it ?
>> 
>> Note that Windows Server 2019 is a staple of the CI testing at Oracle and the test hasn't failed in the > 2 months since it was integrated, so I'm wondering why it fails in your case ?
>> Was this a debug build perhaps ?
>
> I think Xcheck:jni raises a warning when two JNI calls are made in a row w/o calling exception check in between. So it is not necessary to have an actual exception to produce a warning.
> 
> Probably it is reproduced there, because that system is "true" headless, and the execution code path is just different, or something like that, need to check what is the next/prev JNI call.
> Or maybe this method really throw an exception, need some more detail.

Hello,  in our central tests it was indeed a fastdbg OpenJDK.   On my local Windows 10 machine I could not reproduce it.
Our central tests run with -Djava.awt.headless=true , but I think the Win2019 server machine itself is not headless .

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PR: https://git.openjdk.java.net/jdk/pull/6306