Fix native build error: update GraalVM substitution to target KotlinLoggingConfiguration

Agent-Logs-Url: https://github.com/oshai/kotlin-logging/sessions/fb12ce1d-eadb-48ae-8d8f-8cf8962c1db4

Co-authored-by: oshai <2683969+oshai@users.noreply.github.com>

Author: Copilot

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

@@ -0,0 +1,47 @@
+package io.github.oshai.kotlinlogging.internal
+
+import com.oracle.svm.core.annotate.Substitute
+import com.oracle.svm.core.annotate.TargetClass
+import com.oracle.svm.core.annotate.TargetElement
+import io.github.oshai.kotlinlogging.KLoggerFactory
+import io.github.oshai.kotlinlogging.jul.internal.JulLoggerFactory
+import io.github.oshai.kotlinlogging.slf4j.internal.Slf4jLoggerFactory
+import java.util.function.BooleanSupplier
+
+/**
+ * This class is a substitution class as described in
+ * [https://build-native-java-apps.cc/developer-guide/substitution/]. It fixes an issue where the
+ * native build (GraalVM native-image) fails if Logback is not on the classpath. See
+ * [https://github.com/oshai/kotlin-logging/issues/465]. The weird-looking class name is according
+ * to convention.
+ */
+@Suppress("unused")
+internal class Target_io_github_oshai_kotlinlogging_KotlinLoggingConfiguration {
+  @TargetClass(
+    className = "io.github.oshai.kotlinlogging.KotlinLoggingConfiguration",
+    onlyWith = [LogbackNotOnClasspath::class],
+  )
+  companion object {
+    @Substitute
+    @TargetElement(name = "detectLogger")
+    fun detectLogger(): KLoggerFactory {
+      if (System.getProperty("kotlin-logging-to-jul") != null) {
+        return JulLoggerFactory
+      }
+      // Intentionally leave out the logback branch as logback is not on the classpath.
+      // default to SLF4J
+      return Slf4jLoggerFactory
+    }
+  }
+}
+
+internal class LogbackNotOnClasspath : BooleanSupplier {
+  override fun getAsBoolean(): Boolean {
+    try {
+      Class.forName("ch.qos.logback.classic.LoggerContext")
+      return false
+    } catch (_: ClassNotFoundException) {
+      return true
+    }
+  }
+}