some strange WARNING when upgrade form 3.11.3 to 3.12.2 via init command

[Guy Levkowitz]

Hey

when i run below command we get:
 java -jar gerrit3.12.2.war init -d . --batch --delete-caches --install-all-plugins --no-auto-start
WARNING: A restricted method in java.lang.foreign.Linker has been called
WARNING: java.lang.foreign.Linker::downcallHandle has been called by the unnamed module
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for this module

Sep 28, 2025 1:32:17 PM org.apache.lucene.internal.vectorization.VectorizationProvider lookup
WARNING: Java vector incubator module is not readable. For optimal vector performance, pass '--add-modules jdk.incubator.vector' to enable Vector API.

Is this Ok ? 

[Guy Levkowitz]

Also the merge Icon we had was green now it is gray can it be changed back to green ? 

ב-יום ראשון, 28 בספטמבר 2025 בשעה 13:33:26 UTC+3, Guy Levkowitz כתב/ה:

[Matthias Sohn]

This Java warning is raised for lucene which has some optional implementation using Java vector APIs which are still in incubation in JDK 25

See e.g. https://github.com/apache/lucene/blob/releases/lucene/10.2.2/lucene/core/src/java21/org/apache/lucene/internal/vectorization/PanamaVectorizationProvider.java

It looks like lucene will fallback to another implementation if prerequisites for usage of Java vector API are not in place.

See https://github.com/apache/lucene/blob/d54789681eb9f0cacd79d03c30c44de779fb1622/lucene/core/src/java/org/apache/lucene/internal/vectorization/VectorizationProvider.java#L123

 

Is this Ok ? 

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[Yingchun Li]

Hi, did you resolve these issues?  

I also encountered this issue. I followed the suggestion and ran the command:
java --add-modules jdk.incubator.vector --enable-native-access=ALL-UNNAMED -jar temp/gerrit-3.12.3.war init -d gerrit-home

which indeed eliminated the warning. However, it doesn't seem like a good solution, as it deviates from the command recommended in the official documentation. 

Is this Ok ? 

[Matthias Sohn]

Since 10.0.0 Lucene has an implementation of MMapDirectory using Java 21 Project Panama Preview API [1].

I guess that's causing these warnings since in Java 21 the panama API was still in preview.

Gerrit 3.12.2 is using Lucene 10.1.0.

[1] https://github.com/apache/lucene/commit/c8e05c8cd6e018133d3d739d159d5b3b6b29c179 

-Matthias

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