[OpenJDK 2D-Dev] RFR: 8269223: -Xcheck:jni WARNINGs working with fonts on Linux [v4]

[Phil Race]

On Mon, 19 Jul 2021 09:38:27 GMT, Maxim Kartashev <github.com+28651297+mkartashev at openjdk.org> wrote:

>> Added an `ExceptionCheck()` followed by `ExceptionDescribe()` and `ExceptionClear()` immediately after the Java calls made from the callback function `ReadTTFontFileFunc()` in `freetypeScaler.c`. 
>> 
>> The exception(s) need to be cleared because we're not returning immediately to Java that would've been able to handle them gracefully. And in order not to loose the exception entirely (even though the return value would also indicate an error condition), print out the exception with `ExceptionDescribe()` to aid in debugging.
>
> Maxim Kartashev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressed PR comments
>   
>   1. Added CHECK_NULL() to awt_Component.cpp

I'm going to see if the test passes on the internal systems we use which I think will be mostly variout RH/OL systems for this headless test for Linux - and it also will get run on Windows Server of some kind .. I don't think macOS will hit this code path at all for this test.

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