Build on latest Java, test through lowest possible - approach 2

.github/workflows/e2e.yml

@@ -11,13 +11,8 @@ on:
 
 jobs:
   tests:
-    name: "E2E tests on Java ${{ matrix.jdk }}"
+    name: "E2E tests"
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      max-parallel: 1
-      matrix:
-        jdk: [ 8, 11, 17 ]
     steps:
     - name: Checkout project with submodules
       uses: actions/checkout@v4
@@ -40,6 +35,5 @@ jobs:
       run: >
         ./gradlew
         --stacktrace
-        -PnexusPublishPlugin.test.java=${{ matrix.jdk }}
         -Pe2eVerboseOutput
         e2eTest

.github/workflows/java-versions.yml

@@ -15,14 +15,16 @@ jobs:
   openjdk:
     strategy:
       matrix:
-        jdk: [8, 11, 17]
-    name: "OpenJDK ${{ matrix.jdk }}"
+        # TODO: Add 19+
+        jdk: [11, 17]
+        testJdk: [auto, 8]
+    name: "OpenJDK ${{ matrix.jdk }} (with testJDK ${{ matrix.testJdk }})"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4
         with:
-          java-version: 19
+          java-version: ${{ matrix.jdk }}
           distribution: 'zulu'
       - uses: gradle/gradle-build-action@v2
       # Workaround https://github.com/ajoberstar/gradle-stutter/issues/22
@@ -38,4 +40,5 @@ jobs:
       - name: Test cross Java versions compatibility
         run: |
           ./gradlew --version
-          ./gradlew --stacktrace build compatTestJava${{ matrix.jdk }}
+          ./gradlew -q javaToolchains
+          ./gradlew --stacktrace -PnexusPublishPlugin.test.java=${{ matrix.testJdk }} build compatTestJava${{ matrix.jdk }}

.github/workflows/main.yml

@@ -25,4 +25,4 @@ jobs:
         distribution: 'zulu'
     - uses: gradle/gradle-build-action@v2
       with:
-        arguments: --stacktrace build compatTestJava11
+        arguments: --stacktrace build compatTestJava17

build.gradle.kts

@@ -91,7 +91,9 @@ dependencies {
     testImplementation("com.github.tomakehurst:wiremock:2.27.2")
     testImplementation("ru.lanwen.wiremock:wiremock-junit5:1.3.1")
     testImplementation("org.assertj:assertj-core:3.25.1")
-    testImplementation("org.mockito:mockito-junit-jupiter:5.4.0")
+    // This cannot be updated to 5.x as it requires Java 11,
+    // but we are running tests on CI with Java 8 in .github/workflows/java-versions.yml.
+    testImplementation("org.mockito:mockito-junit-jupiter:4.11.0")
     testImplementation("com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0")
 }
 
@@ -127,6 +129,14 @@ stutter {
                 compatibleRange("7.3")
             }
         }
+        register("javaauto") {
+            javaToolchain {
+                languageVersion = JavaLanguageVersion.of(JavaVersion.current().majorVersion)
+            }
+            gradleVersions {
+                compatibleRange("7.3")
+            }
+        }
     }
 }
 
@@ -172,7 +182,7 @@ kotlin.target.compilations.configureEach {
     compilerOptions.configure {
         // Gradle fully supports running on Java 8: https://docs.gradle.org/current/userguide/compatibility.html,
         // so we should allow users to do that too.
-        jvmTarget = JvmTarget.fromTarget(JavaVersion.VERSION_1_8.toString())
+        jvmTarget = JvmTarget.fromTarget(project.java.targetCompatibility.toString())
 
         // Suppress "Language version 1.3 is deprecated and its support will be removed in a future version of Kotlin".
         freeCompilerArgs.add("-Xsuppress-version-warnings")
@@ -272,7 +282,15 @@ tasks {
     }
     named<Test>("test").configure {
         javaLauncher = project.javaToolchains.launcherFor {
-            languageVersion = JavaLanguageVersion.of(11)
+            languageVersion = providers
+                .gradleProperty("nexusPublishPlugin.test.java")
+                .map {
+                    if (it == "auto") {
+                        JavaLanguageVersion.of(JavaVersion.current().majorVersion)
+                    } else {
+                        JavaLanguageVersion.of(it)
+                    }
+                }
         }
     }
 }

stutter.lockfile

@@ -2,3 +2,4 @@
 java11=6.2.2,6.9.4,7.0.2,7.6.2,8.0.2,8.2.1
 java17=7.3.3,7.6.2,8.0.2,8.2.1
 java8=6.2.2,6.9.4,7.0.2,7.6.2,8.0.2,8.2.1
+javaauto=7.3.3,7.6.2,8.0.2,8.2.1