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In v8.x, io.github.oshai.kotlinlogging.internal.KLoggerFactory was moved to io.github.oshai.kotlinlogging.KotlinLoggingConfiguration, but the GraalVM @TargetClass substitution still referenced the old internal class. When Logback is absent from the native image classpath, the onlyWith condition activates the substitution — which then fails because the target class no longer exists at that location.

Changes

• Renamed Target_io_github_oshai_kotlinlogging_internal_KLoggerFactory.kt → Target_io_github_oshai_kotlinlogging_KotlinLoggingConfiguration.kt (following the Target_ naming convention)
• Updated @TargetClass to target "io.github.oshai.kotlinlogging.KotlinLoggingConfiguration" (the v8.x home of the logger factory detection logic)
• Updated the substituted method from logger$kotlin_logging(name: String): KLogger to detectLogger(): KLoggerFactory — the method in KotlinLoggingConfiguration that references LogbackLoggerFactory and needs to be bypassed when Logback is not on the classpath
• Restored the original LogbackNotOnClasspath condition — since the target class now correctly exists in v8.x, no extra class-existence check is needed

This ensures GraalVM substitutes the correct method in the correct class, preventing native image build failures when Logback is absent from the classpath.

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[oshai]

LoggerFactory moved not deleted

[Copilot]

LoggerFactory moved not deleted

Fixed in 5b822c2 — the substitution now correctly targets KotlinLoggingConfiguration in io.github.oshai.kotlinlogging (substituting detectLogger()) instead of the deleted internal class.

[Copilot]

Pull request overview

This PR updates the JVM-side GraalVM substitution used by kotlin-logging’s native-image support so it targets the v8.x logger-detection implementation in KotlinLoggingConfiguration instead of the removed internal KLoggerFactory target.

Changes:

• Renames the Graal substitution class/file to match the new v8.x target naming.
• Retargets @TargetClass from the removed internal factory to io.github.oshai.kotlinlogging.KotlinLoggingConfiguration.
• Replaces the old substituted logger-construction method with a substitution for detectLogger() that avoids the Logback path when Logback is absent.

Comments suppressed due to low confidence (1)

src/jvmMain/kotlin/io/github/oshai/kotlinlogging/internal/Target_io_github_oshai_kotlinlogging_KotlinLoggingConfiguration.kt:33

• This substitution no longer preserves the JVM detectLogger() behavior for the kotlin-logging-to-direct=true override. In native images built without Logback, that property will now be ignored and loggerFactory will fall back to SLF4J, which breaks the documented way to opt into DirectLoggerFactory on JVM.

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