Questions for JDK-4947890

[Mandy Chung]

Hi Ichiroh,

This behavioral change is not intentional.  It's a bug introduced in 
JDK-4947890.  I create https://bugs.openjdk.java.net/browse/JDK-8275145 
for this issue.

Thanks for the investigation.
Mandy

On 10/12/21 2:44 AM, Ichiroh Takiguchi wrote:
> I have some questions for JDK-4947890。
>
> One of app’s JVM was upgraded from JDK11 to JDK17.
> Then the working behavior was changed on Windows 10 Multilingual User 
> Interface (MUI).
> (Base was Japanese Windows 10, display language setting was English 
> (United States))
>
> In my investigation, the working behavior was changed by JDK12+b23.
>   JDK-4947890 Minimize JNI upcalls in system-properties initialization 
> [1]
>
> Following change was applied on 
> src/java.base/share/native/libjava/System.c,
> From (not for MacOS platform) [2]
>   Put sprops->sun_jnu_encoding into file.encoding system property
> To [3]
>   Put sprops->encoding into file.encoding system property
>
> I checked JDK-4947890’s CSR JDK-8213895 [4]
>   Modify JVM interface functions for property initialization
>
> But it seems that above CSR does not mention such a significant 
> specification change.
>
> I checked JDK17u, same code was still used [5].
>
> Questions:
> I’d like to confirm
> * This change was intentional or not ?
> * We can revert tp JDK11’s spec ?
>
> Thanks,
> Ichiroh Takiguchi
>
> [1] https://bugs.openjdk.java.net/browse/JDK-4947890
> [2] http://hg.openjdk.java.net/jdk/jdk/rev/0bdbf854472f#l12.466
> [3] http://hg.openjdk.java.net/jdk/jdk/rev/0bdbf854472f#l12.276
> [4] https://bugs.openjdk.java.net/browse/JDK-8213895
> [5] 
> https://github.com/openjdk/jdk17u/blob/master/src/java.base/share/native/libjava/System.c#L149