Warnings about calls to sun.misc.Unsafe under Java 24

[m-burst]

When running ktlint using the plugin under Java 24 and with Kotlin version 2.2.10, the following warnings appear:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.jetbrains.kotlin.com.intellij.util.containers.Unsafe (file:/Users/m_burst/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-compiler-embeddable/2.2.10/6882d39ef03b18879c1a5d2a83c2212361bed5fe/kotlin-compiler-embeddable-2.2.10.jar)
WARNING: Please consider reporting this to the maintainers of class org.jetbrains.kotlin.com.intellij.util.containers.Unsafe
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release

The root cause of the warnings seems to be in the Kotlin compiler (see issue), and I can see that other projects have added workarounds to suppress these warnings (e.g. in kotlinc's own run script and in ktlint).

[m-burst]

As far as I understand, the correct place to add the arguments should be in BaseKtLintCheckTask#submitKtLintWork, where --add-opens are added for Java 16+.

However, org.gradle.api.JavaVersion#VERSION_24 is only supported since Gradle 7.6, while the plugin aims to support Gradle 7.4+, so the change is not so trivial as it might seem to be.

[wakingrufus]

Maybe we should wait for https://youtrack.jetbrains.com/issue/IJPL-191435/WARNING-sun.misc.UnsafearrayBaseOffset-called-by-com.intellij.util.containers.Unsafe-on-running-intellij-code-in-Kotlin-under but I wouldn't be opposed to bumping up the minimum Gradle after we release the Gradle 9 compatible version. It would be a major version bump and we would increase the default ktlint version at the same time.

[JLLeitschuh]

I presume this was fixed in the update? Anyone still experiencing this issue?

[m-burst]

We are still seeing the warnings during our builds, using the latest Gradle (9.2.0) and the latest Kotlin (2.2.21).

[usmank-fielmann]

We are also experiencing same warnings.

Gradle: 8.9
Kotlin: 2.2.0

[savdeevplum]

Hey,
Same thing with Kotlin 2.3.0 and Gradle 9.2 unfortunately.
Maybe it is possible to expose configuration property similar to jvmArgs for JavaExec type of tasks as a workaround if bumping minimal Gradle version is not an option?

[savdeevplum]

If someone can recommend viable workaround for the time being - would be very much appreciated 🙇