junit-team · marcphilipp · Sep 30, 2025 · Sep 30, 2025 · Sep 30, 2025
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -63,6 +63,7 @@ openTestReporting-events = { module = "org.opentest4j.reporting:open-test-report
 openTestReporting-tooling-core = { module = "org.opentest4j.reporting:open-test-reporting-tooling-core", version.ref = "openTestReporting" }
 openTestReporting-tooling-spi = { module = "org.opentest4j.reporting:open-test-reporting-tooling-spi", version.ref = "openTestReporting" }
 picocli = { module = "info.picocli:picocli", version = "4.7.7" }
+roseau-cli = { module = "io.github.alien-tools:roseau-cli", version = "0.3.0" }
 slf4j-julBinding = { module = "org.slf4j:slf4j-jdk14", version = "2.0.17" }
 snapshotTests-junit5 = { module = "de.skuzzle.test:snapshot-tests-junit5", version.ref = "snapshotTests" }
 snapshotTests-xml = { module = "de.skuzzle.test:snapshot-tests-xml", version.ref = "snapshotTests" }

diff --git a/gradle/plugins/japicmp/build.gradle.kts → ...s/backward-compatibility/build.gradle.kts b/gradle/plugins/japicmp/build.gradle.kts → ...s/backward-compatibility/build.gradle.kts
diff --git a/...main/kotlin/junitbuild.japicmp.gradle.kts → ...itbuild.backward-compatibility.gradle.kts b/...main/kotlin/junitbuild.japicmp.gradle.kts → ...itbuild.backward-compatibility.gradle.kts
@@ -1,11 +1,13 @@
+
 import de.undercouch.gradle.tasks.download.Download
+import junitbuild.compatibility.BackwardCompatibilityChecksExtension
+import junitbuild.compatibility.japicmp.AcceptedViolationSuppressor
+import junitbuild.compatibility.japicmp.AcceptedViolationsPostProcessRule
+import junitbuild.compatibility.japicmp.BreakingSuperClassChangeRule
+import junitbuild.compatibility.japicmp.InternalApiFilter
+import junitbuild.compatibility.japicmp.SourceIncompatibleRule
+import junitbuild.extensions.dependencyFromLibs
 import junitbuild.extensions.javaModuleName
-import junitbuild.japicmp.AcceptedViolationSuppressor
-import junitbuild.japicmp.AcceptedViolationsPostProcessRule
-import junitbuild.japicmp.BreakingSuperClassChangeRule
-import junitbuild.japicmp.InternalApiFilter
-import junitbuild.japicmp.JApiCmpExtension
-import junitbuild.japicmp.SourceIncompatibleRule
 import me.champeau.gradle.japicmp.JapicmpTask
 import me.champeau.gradle.japicmp.report.stdrules.BinaryIncompatibleRule
 import me.champeau.gradle.japicmp.report.stdrules.RecordSeenMembersSetup
@@ -16,7 +18,15 @@ plugins {
 	id("me.champeau.gradle.japicmp")
 }
 
-val extension = extensions.create<JApiCmpExtension>("japicmp").apply {
+val roseauDependencies = configurations.dependencyScope("roseau")
+val roseauClasspath = configurations.resolvable("roseauClasspath") {
+	extendsFrom(roseauDependencies.get())
+}
+dependencies {
+	roseauDependencies(dependencyFromLibs("roseau-cli"))
+}
+
+val extension = extensions.create<BackwardCompatibilityChecksExtension>("backwardCompatibilityChecks").apply {
 	enabled.convention(true)
 	acceptedIncompatibilities.apply {
 		val acceptedBreakingChangesFile = rootProject.layout.projectDirectory.file("gradle/config/japicmp/accepted-breaking-changes.txt")
@@ -48,11 +58,58 @@ val downloadPreviousReleaseJar by tasks.registering(Download::class) {
 	outputs.cacheIf { true }
 }
 
-val checkBackwardCompatibility by tasks.registering(JapicmpTask::class) {
+val roseauCsvFile = layout.buildDirectory.file("reports/roseau/breaking-changes.csv")
+
+val roseau by tasks.registering(JavaExec::class) {
+	if (gradle.startParameter.isOffline) {
+		enabled = false
+	}
+	onlyIf { extension.enabled.get() }
+
+	mainClass = "io.github.alien.roseau.cli.RoseauCLI"
+	classpath = files(roseauClasspath)
+
+	inputs.files(configurations.compileClasspath)
+		.withNormalizer(CompileClasspathNormalizer::class)
+		.withPropertyName("apiClasspath")
+
+	val v1Jar = downloadPreviousReleaseJar.map { it.outputFiles.single() }
+	inputs.file(v1Jar)
+		.withNormalizer(CompileClasspathNormalizer::class)
+		.withPropertyName("v1")
+
+	val v2Jar = tasks.jar.flatMap { it.archiveFile }.map { it.asFile }
+	inputs.file(v2Jar)
+		.withNormalizer(CompileClasspathNormalizer::class)
+		.withPropertyName("v2")
+
+	outputs.file(roseauCsvFile)
+		.withPropertyName("report")
+
+	argumentProviders.add(CommandLineArgumentProvider {
+		val args = listOf(
+			"--classpath", configurations.compileClasspath.get().asPath,
+			"--v1", v1Jar.get().absolutePath,
+			"--v2", v2Jar.get().absolutePath,
+			"--diff",
+			"--report", roseauCsvFile.get().asFile.absolutePath,
+		)
+		println(args)
+		args
+	})
+
+	doFirst {
+		roseauCsvFile.get().asFile.parentFile.mkdirs()
+	}
+}
+
+val japicmp by tasks.registering(JapicmpTask::class) {
 	if (gradle.startParameter.isOffline) {
 		enabled = false
 	}
 	onlyIf { extension.enabled.get() }
+	shouldRunAfter(roseau)
+
 	oldClasspath.from(downloadPreviousReleaseJar.map { it.outputFiles })
 	newClasspath.from(tasks.jar)
 	onlyModified = true
@@ -72,6 +129,10 @@ val checkBackwardCompatibility by tasks.registering(JapicmpTask::class) {
 	}
 }
 
+val checkBackwardCompatibility by tasks.registering {
+	dependsOn(roseau, japicmp)
+}
+
 tasks.check {
 	dependsOn(checkBackwardCompatibility)
 }
@@ -80,7 +141,7 @@ afterEvaluate {
 	val params = mapOf(
 		"acceptedIncompatibilities" to extension.acceptedIncompatibilities.get().joinToString(",")
 	)
-	checkBackwardCompatibility {
+	japicmp {
 		richReport {
 			addViolationTransformer(AcceptedViolationSuppressor::class.java, params)
 			addPostProcessRule(AcceptedViolationsPostProcessRule::class.java, params)

diff --git a/...in/junitbuild/japicmp/JApiCmpExtension.kt → ...y/BackwardCompatibilityChecksExtension.kt b/...in/junitbuild/japicmp/JApiCmpExtension.kt → ...y/BackwardCompatibilityChecksExtension.kt
@@ -1,9 +1,9 @@
-package junitbuild.japicmp
+package junitbuild.compatibility
 
 import org.gradle.api.provider.Property
 import org.gradle.api.provider.SetProperty
 
-abstract class JApiCmpExtension {
+abstract class BackwardCompatibilityChecksExtension {
 
     abstract val enabled: Property<Boolean>
 

diff --git a/...ld/japicmp/AcceptedViolationSuppressor.kt → ...ty/japicmp/AcceptedViolationSuppressor.kt b/...ld/japicmp/AcceptedViolationSuppressor.kt → ...ty/japicmp/AcceptedViolationSuppressor.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import japicmp.model.JApiBehavior
 import japicmp.model.JApiClass

diff --git a/...icmp/AcceptedViolationsPostProcessRule.kt → ...icmp/AcceptedViolationsPostProcessRule.kt b/...icmp/AcceptedViolationsPostProcessRule.kt → ...icmp/AcceptedViolationsPostProcessRule.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import me.champeau.gradle.japicmp.report.PostProcessViolationsRule
 import me.champeau.gradle.japicmp.report.Severity.accepted

diff --git a/...d/japicmp/BreakingSuperClassChangeRule.kt → ...y/japicmp/BreakingSuperClassChangeRule.kt b/...d/japicmp/BreakingSuperClassChangeRule.kt → ...y/japicmp/BreakingSuperClassChangeRule.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import japicmp.model.JApiCompatibility
 import me.champeau.gradle.japicmp.report.Violation

diff --git a/...n/junitbuild/japicmp/InternalApiFilter.kt → ...ompatibility/japicmp/InternalApiFilter.kt b/...n/junitbuild/japicmp/InternalApiFilter.kt → ...ompatibility/japicmp/InternalApiFilter.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import japicmp.filter.BehaviorFilter
 import japicmp.filter.ClassFilter

diff --git a/...ld/japicmp/JApiCompatibilityExtensions.kt → ...ty/japicmp/JApiCompatibilityExtensions.kt b/...ld/japicmp/JApiCompatibilityExtensions.kt → ...ty/japicmp/JApiCompatibilityExtensions.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import japicmp.model.JApiBehavior
 import japicmp.model.JApiClass

diff --git a/...itbuild/japicmp/SourceIncompatibleRule.kt → ...ibility/japicmp/SourceIncompatibleRule.kt b/...itbuild/japicmp/SourceIncompatibleRule.kt → ...ibility/japicmp/SourceIncompatibleRule.kt
@@ -1,4 +1,4 @@
-package junitbuild.japicmp
+package junitbuild.compatibility.japicmp
 
 import japicmp.model.JApiCompatibility
 import me.champeau.gradle.japicmp.report.Violation

diff --git a/gradle/plugins/common/build.gradle.kts b/gradle/plugins/common/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 dependencies {
 	implementation("junitbuild.base:dsl-extensions")
 	implementation(projects.buildParameters)
-	implementation(projects.japicmp)
+	implementation(projects.backwardCompatibility)
 	implementation(libs.plugins.kotlin.markerCoordinates)
 	implementation(libs.plugins.bnd.markerCoordinates)
 	implementation(libs.plugins.commonCustomUserData.markerCoordinates)

diff --git a/gradle/plugins/common/src/main/kotlin/junitbuild.java-aggregator-conventions.gradle.kts b/gradle/plugins/common/src/main/kotlin/junitbuild.java-aggregator-conventions.gradle.kts
@@ -1,4 +1,4 @@
-import junitbuild.japicmp.JApiCmpExtension
+import junitbuild.compatibility.BackwardCompatibilityChecksExtension
 
 plugins {
 	id("junitbuild.java-library-conventions")
@@ -10,6 +10,6 @@ tasks.javadoc {
 	enabled = false
 }
 
-the<JApiCmpExtension>().apply {
+the<BackwardCompatibilityChecksExtension>().apply {
 	enabled = false // already checked by individual projects
 }
diff --git a/gradle/plugins/common/src/main/kotlin/junitbuild.java-library-conventions.gradle.kts b/gradle/plugins/common/src/main/kotlin/junitbuild.java-library-conventions.gradle.kts
@@ -26,7 +26,7 @@ if (project in mavenizedProjects) {
 	apply(plugin = "junitbuild.javadoc-conventions")
 	apply(plugin = "junitbuild.publishing-conventions")
 	apply(plugin = "junitbuild.osgi-conventions")
-	apply(plugin = "junitbuild.japicmp")
+	apply(plugin = "junitbuild.backward-compatibility")
 
 	java {
 		withSourcesJar()

diff --git a/gradle/plugins/settings.gradle.kts b/gradle/plugins/settings.gradle.kts
@@ -19,10 +19,10 @@ dependencyResolutionManagement {
 
 rootProject.name = "plugins"
 
+include("backward-compatibility")
 include("build-parameters")
 include("common")
 include("code-generator")
-include("japicmp")
 include("publishing")
 
 enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
diff --git a/junit-jupiter-api/junit-jupiter-api.gradle.kts b/junit-jupiter-api/junit-jupiter-api.gradle.kts
@@ -36,7 +36,7 @@ tasks {
 	compileJava {
 		options.compilerArgs.add("-Xlint:-module") // due to qualified exports
 	}
-	checkBackwardCompatibility {
+	japicmp {
 		classExcludes.addAll($$"*.AssertionsKt$assert*", $$"*.AssertionsKt$evaluate*")
 	}
 	jar {

diff --git a/junit-platform-console-standalone/junit-platform-console-standalone.gradle.kts b/junit-platform-console-standalone/junit-platform-console-standalone.gradle.kts
@@ -22,7 +22,7 @@ dependencies {
 	osgiVerification(libs.openTestReporting.tooling.spi)
 }
 
-japicmp {
+backwardCompatibilityChecks {
 	enabled = false // already checked by individual projects
 }