ServiceLoader fails for Java 23 with preview enabled

[Uwe Schindler]

Hi,

I cannot confirm this. Apache Lucene (just released today in version 
10.0.0, but also previous veersion 9.12.0) can open indexes just fine, 
both with preview enabled or not. I modified the start script of the 
"Luke" GUI to use classpath mode and add the "--enable-preview" flag. 
All variants work (SPI from declared module-info.class SPIs or using 
META-INF/services).

If ServiceLoader won't work, Lucene would fails to open any indexes.

To test, just download Apache Lucene, put JDK 23 as first entry on your 
$PATH and start bin/luke.sh. To test other variants change the script 
file by changing to use classpath mode (by invoking 
"org.apache.lucene.luke.app.desktop.LukeMain" class directly and change 
module-path to classpath with "/*").

Uwe

Am 13.10.2024 um 13:53 schrieb Robert Scholte:
>
> Hi,
>
> It seems there’s a change in the ServiceLoader, and it looks like 
> regression to me.
>
> I’ve created a small project to reproduce it (I can provide it if 
> wanted and confirmed this is indeed a bug).
>
> What it basically does is just:
>
> ServiceLoader.load(Car.class).findFirst().orElseThrow();
>
> This succeeds with OpenJDK 22 (with and without preview enabled flag)
>
> It also succeeds with OpenJDK 23 without the preview flag.
>
> However, when adding the preview flag I get:
>
> java.util.NoSuchElementException: No value present
>
>         at java.base/java.util.Optional.orElseThrow(Optional.java:377)
>
>         at 
> nl.sourcegrounds.serviceloader.tck.CarTest.<init>(CarTest.java:16)
>
> Anyone who can already explain this with this small amount of information?
>
> Thanks,
>
> Robert Scholte
>
> These are the details for both versions (Windows OS)
>
> openjdk version "22" 2024-03-19
>
> OpenJDK Runtime Environment (build 22+36-2370)
>
> OpenJDK 64-Bit Server VM (build 22+36-2370, mixed mode, sharing)
>
> openjdk version "23" 2024-09-17
>
> OpenJDK Runtime Environment (build 23+37-2369)
>
> OpenJDK 64-Bit Server VM (build 23+37-2369, mixed mode, sharing)
>
-- 
Uwe Schindler
uschindler at apache.org 
ASF Member, Member of PMC and Committer of Apache Lucene and Apache Solr
Bremen, Germany
https://lucene.apache.org/
https://solr.apache.org/
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