Replace the Log4j implementation with Logback

build.gradle.kts

@@ -211,7 +211,7 @@ subprojects {
                 // Ensure all OkHttp versions match our version >= 4 to avoid Kotlin vs. Java issues with OkHttp 3.
                 force(rootProject.libs.okhttp)
 
-                // Ensure all API library versions match our core library version.
+                // Ensure all Log4j API versions match our version.
                 force(rootProject.libs.log4jApi)
 
                 // Ensure that all transitive versions of Kotlin libraries match our version of Kotlin.
@@ -243,7 +243,7 @@ subprojects {
                 jdkVersion.set(11)
 
                 val jacksonVersion = libs.versions.jackson.get()
-                val log4jVersion = libs.versions.log4j.get()
+                val log4jApiVersion = libs.versions.log4jApi.get()
 
                 externalDocumentationLink {
                     val baseUrl = "https://codehaus-plexus.github.io/plexus-containers/plexus-container-default/apidocs"
@@ -265,7 +265,7 @@ subprojects {
                 }
 
                 externalDocumentationLink {
-                    val majorVersion = log4jVersion.substringBefore('.')
+                    val majorVersion = log4jApiVersion.substringBefore('.')
                     val baseUrl = "https://logging.apache.org/log4j/$majorVersion.x/log4j-api/apidocs"
                     url.set(URL(baseUrl))
                     packageListUrl.set(URL("$baseUrl/package-list"))

cli/build.gradle.kts

@@ -156,8 +156,8 @@ dependencies {
     implementation(libs.jacksonDatabind)
     implementation(libs.jacksonModuleKotlin)
     implementation(libs.kotlinxCoroutines)
-    implementation(libs.log4jCore)
-    implementation(libs.log4jImplSlf4j)
+    implementation(libs.log4jApiToSlf4j)
+    implementation(libs.logbackClassic)
     implementation(libs.postgres)
     implementation(libs.reflections)
     implementation(libs.sw360Client)

cli/src/main/kotlin/OrtMain.kt

@@ -20,6 +20,9 @@
 
 package org.ossreviewtoolkit.cli
 
+import ch.qos.logback.classic.Level
+import ch.qos.logback.classic.Logger
+
 import com.github.ajalt.clikt.completion.completionOption
 import com.github.ajalt.clikt.core.CliktCommand
 import com.github.ajalt.clikt.core.context
@@ -39,9 +42,6 @@ import java.io.File
 
 import kotlin.system.exitProcess
 
-import org.apache.logging.log4j.Level
-import org.apache.logging.log4j.core.config.Configurator
-
 import org.ossreviewtoolkit.cli.commands.*
 import org.ossreviewtoolkit.cli.utils.logger
 import org.ossreviewtoolkit.model.config.LicenseFilenamePatterns
@@ -57,6 +57,8 @@ import org.ossreviewtoolkit.utils.ort.ortConfigDirectory
 import org.ossreviewtoolkit.utils.ort.ortDataDirectory
 import org.ossreviewtoolkit.utils.ort.printStackTrace
 
+import org.slf4j.LoggerFactory
+
 /**
  * Helper class for mutually exclusive command line options of different types.
  */
@@ -171,7 +173,8 @@ class OrtMain : CliktCommand(name = ORT_NAME, invokeWithoutSubcommand = true) {
     }
 
     override fun run() {
-        Configurator.setRootLevel(logLevel)
+        val rootLogger = LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME) as Logger
+        rootLogger.level = logLevel
 
         logger.debug { "Used command line arguments: ${currentContext.originalArgv}" }
 

cli/src/main/resources/META-INF/native-image/reflect-config.json

@@ -0,0 +1,296 @@
+[
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.CallerDataConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.CallerDataConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.ClassOfCallerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.ContextNameConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.DateConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.ExtendedThrowableProxyConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.FileOfCallerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.LevelConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.LineOfCallerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.LineSeparatorConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.LocalSequenceNumberConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.LoggerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.MDCConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.MarkerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.MessageConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.MethodOfCallerConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.NopThrowableInformationConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.PrefixCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.PropertyConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.RelativeTimeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.RootCauseFirstThrowableProxyConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.ThreadConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.ThrowableProxyConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.classic.pattern.color.HighlightingCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.IdentityCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.ReplacingCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BlackCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BlueCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldBlueCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldCyanCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldGreenCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldMagentaCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldRedCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldWhiteCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.BoldYellowCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.CyanCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.GrayCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.GreenCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.MagentaCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.RedCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.WhiteCompositeConverter",
+    "allPublicConstructors": true
+  },
+  {
+    "condition": {
+      "typeReachable": "ch.qos.logback.classic.LoggerContext"
+    },
+    "name": "ch.qos.logback.core.pattern.color.YellowCompositeConverter",
+    "allPublicConstructors": true
+  }
+]