uschindler commented on PR #13146:
URL: https://github.com/apache/lucene/pull/13146#issuecomment-1971597031
Hi,
I will make a separate PR for this: At moment the Java 21 separate sourceSet
is a MRJAR version section. At the moment we would not need a MR-JAR, as we can
merge the classes together, so I propose to add this code:
```groovy
tasks.named('jar').configure {
boolean needMRJAR = false;
mrjarJavaVersions.each { jdkVersion ->
boolean isBaseVersion = (jdkVersion.toString() ==
rootProject.minJavaVersion.toString())
into(isBaseVersion ? '' : "META-INF/versions/${jdkVersion}") {
from sourceSets["main${jdkVersion}"].output
}
needMRJAR |= !isBaseVersion
}
if (needMRJAR) {
manifest.attributes(
'Multi-Release': 'true'
)
}
}
```
This copies the files from the `main21` sourceset to the JAR's main folder.
It only enables `Multi-Release: true` manifest entry, if there is another java
version != the base java version (21) available.
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