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Upgrade kotlin-metadata-jvm tool in JNIgen to support version 2.4.0 and newer #3597
Description
Flutter 3.47 has bumped the default recommended Kotlin version (including in project templates) to 2.4.0.
It makes sense to upgrade kotlin-metadata-jvm so that the minimum supported language version is at least 2.4.0.
Flutter updates seem to move faster than JNIgen updates for some reason. Perhaps patches for upgrading kotlin-metadata-jvm could be released more often, or at least before a new stable version of Flutter approaches release window?
Also, Flutter shows the following warning when building an application (for JNIgen generation) with a language version lower than 2.4.0:
Warning: Flutter support for your project's Kotlin version (2.3.0) will soon be dropped. Please upgrade your Kotlin version to a version of at least 2.3.20 soon.
Alternatively, use the flag "--android-skip-build-dependency-validation" to bypass this check.
Potential fix: Your project's KGP version is typically defined in the plugins block of the `settings.gradle` file, by a plugin with the id of org.jetbrains.kotlin.android.
If you don't see a plugins block, your project was likely created with an older template version, in which case it is most likely defined in the top-level build.gradle file by the ext.kotlin_version property.
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liamappelbe commentedon Aug 30, 2026
This is fixed at HEAD, so you'll see the update when I publish the new version of jnigen (some time this week). But I did find a couple more places in the monorepo that haven't been bumped yet, in the jni_flutter example and test.