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

[Matthias Baesken]

On Wed, 10 Nov 2021 08:47:10 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> 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 .

I could add a  J2dTraceLn(J2D_TRACE_ERROR, . . . )  in case an exception occurs.  The J2dTraceLn  is already used at some other places in  DWMIsCompositionEnabled so it might fit better than just ignoring the exception.

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