From 74282dd999035715a608f25bf212d32977e05c22 Mon Sep 17 00:00:00 2001
From: Andriy Redko <andriy.redko@aiven.io>
Date: Wed, 3 Jan 2024 11:13:58 -0500
Subject: [PATCH] Refactor the runtime Java selection

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>
---
 .github/workflows/test-jdk8-compat-unit.yml |  2 +-
 .github/workflows/test-unit.yml             | 15 ++++++++++-
 java-client/build.gradle.kts                | 30 +++++++++------------
 3 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/.github/workflows/test-jdk8-compat-unit.yml b/.github/workflows/test-jdk8-compat-unit.yml
index bf7bffc184..a5e73fce6e 100644
--- a/.github/workflows/test-jdk8-compat-unit.yml
+++ b/.github/workflows/test-jdk8-compat-unit.yml
@@ -27,4 +27,4 @@ jobs:
           cache: 'gradle'
 
       - name: Run Unit Test
-        run: ./gradlew clean unitTest -Pcheck-jdk8-compatibility=true
+        run: ./gradlew clean unitTest -Druntime.java=8
diff --git a/.github/workflows/test-unit.yml b/.github/workflows/test-unit.yml
index 982d3d957a..14fa9a538f 100644
--- a/.github/workflows/test-unit.yml
+++ b/.github/workflows/test-unit.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 8, 11, 17, 21 ]
         os: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout Java Client
@@ -21,4 +21,17 @@ jobs:
           cache: 'gradle'
 
       - name: Run Unit Test
+        if: ${{ matrix.java != 8 }}
         run: ./gradlew clean unitTest
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        if: ${{ matrix.java == 8 }}
+        with:
+          java-version: 11
+          distribution: 'temurin'
+          cache: 'gradle'
+
+      - name: Run Unit Test
+        if: ${{ matrix.java == 8 }}
+        run: ./gradlew clean unitTest -D"runtime.java=8"
diff --git a/java-client/build.gradle.kts b/java-client/build.gradle.kts
index dd29517d09..ea80a59f33 100644
--- a/java-client/build.gradle.kts
+++ b/java-client/build.gradle.kts
@@ -64,6 +64,12 @@ configurations {
     }
 }
 
+val runtimeJavaVersion = (System.getProperty("runtime.java")?.toInt())?.let(JavaVersion::toVersion) ?: JavaVersion.current()
+logger.quiet("=======================================")
+logger.quiet("  Runtime JDK Version   : " + runtimeJavaVersion)
+logger.quiet("  Gradle JDK Version    : " + JavaVersion.current())
+logger.quiet("=======================================")
+
 java {
     targetCompatibility = JavaVersion.VERSION_1_8
     sourceCompatibility = JavaVersion.VERSION_1_8
@@ -74,6 +80,11 @@ java {
     registerFeature("awsSdk2Support") {
         usingSourceSet(sourceSets.get("main"))
     }
+    
+    toolchain {
+      languageVersion = JavaLanguageVersion.of(runtimeJavaVersion.majorVersion)
+      vendor = JvmVendorSpec.ADOPTIUM
+    }
 }
 
 tasks.withType<ProcessResources> {
@@ -338,9 +349,7 @@ publishing {
     }
 }
 
-// Use `-Pcheck-jdk8-compatibility=true` to
-val jdk8compatibility = (project.findProperty("check-jdk8-compatibility") as String?).toBoolean()
-if (JavaVersion.current() >= JavaVersion.VERSION_11 && jdk8compatibility == false) {
+if (runtimeJavaVersion >= JavaVersion.VERSION_11) {
   val java11: SourceSet = sourceSets.create("java11") {
     java {
       compileClasspath += sourceSets.main.get().output + sourceSets.test.get().output
@@ -372,17 +381,4 @@ if (JavaVersion.current() >= JavaVersion.VERSION_11 && jdk8compatibility == fals
     testClassesDirs += java11.output.classesDirs
     classpath = sourceSets["java11"].runtimeClasspath
   }
-} else if (jdk8compatibility == true) {
-    java {
-        toolchain {
-          languageVersion = JavaLanguageVersion.of(8)
-          vendor = JvmVendorSpec.ADOPTIUM
-        }
-    }
-
-    tasks.register<Test>("tests-jdk8") {
-      javaLauncher = javaToolchains.launcherFor {
-        languageVersion = JavaLanguageVersion.of(8)
-      }
-    }
-}
+}
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