I think I see - in theory we could merge into the "regular" source,
aside from the extra hiding, but we might have to recreate this as
soon as we start messing around with JDK25. I guess as long as we
track JDK-specific features (incubation, preview, etc), then we need
this.

On Tue, Jul 8, 2025 at 11:17 AM Uwe Schindler <u...@thetaphi.de> wrote:
>
> Hi,
>
> This is because the compilation/processing is different. The files are 
> compiled with a Java 24 API extract (apijar file) of the Incubator modules 
> and are NOT compiled against the current JDK. In addition it allows us to 
> make sure no classes from there appear in public APIs or can be referenced 
> from there. This is done because compilation with "-release" does not work 
> with a later JDK like 25 (as it is not part of backwards compatibility) and 
> the APIs may suddenly change in later Java versions. Therefore the 
> compilation is done using a stub: 
> https://github.com/apache/lucene/tree/main/lucene/core/src/generated/jdk
>
> In addition when Panama Vector enters Preview mode (should happen hopefully 
> soon after Java 25) we need a separate sourceset anyways.
>
> Uwe
>
> Am 08.07.2025 um 16:58 schrieb Michael Sokolov:
>
> I'm curious why we have lucene/core/src/java24 directory/module on main 
> branch instead of moving these classes to lucene/core/src/java, now that 
> JDK24 is mandatory.
>
> --
> Uwe Schindler
> Achterdiek 19, D-28357 Bremen
> https://www.thetaphi.de
> eMail: u...@thetaphi.de

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