Require Java 17 for the build

.github/workflows/main.yml

@@ -26,35 +26,12 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        java-version: [11, 17, 21]
+        java-version: [17, 21, 24]
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: 'true'
 
-      # Special handling to test against Java 8:
-      # antlr version 4.10 requires Java 11 to run the antlr tool, but tests still need to run
-      # against Java 8 - that's being done here:
-      - name: Set up Java 8
-        if: ${{ matrix.java-version == '11' }}
-        uses: actions/setup-java@v4
-        with:
-          distribution: 'temurin'
-          java-version: 8
-      - name: Configure env with Java 8 home
-        if: ${{ matrix.java-version == '11' }}
-        run:
-          echo "JAVA_8_HOME=$JAVA_HOME" >> $GITHUB_ENV
-      - name: Enable Java 8 tests
-        if: ${{ matrix.java-version == '11' }}
-        run:
-          echo "ADDITIONAL_GRADLE_OPTS=-PalsoTestAgainstJava8" >> $GITHUB_ENV
-      - name: Configure Java 8 home for Gradle
-        if: ${{ matrix.java-version == '11' }}
-        run: |
-          mkdir -p $HOME/.gradle
-          echo "org.gradle.java.installations.fromEnv=JAVA_8_HOME" >> $HOME/.gradle/gradle.properties
-
       - name: Set up JDK ${{ matrix.java-version }}
         uses: actions/setup-java@v4
         with:
@@ -69,7 +46,7 @@ jobs:
       - name: Spotless Check
           # Spotless must run in a different invocation, because
           # it has some weird Gradle configuration/variant issue
-        if: ${{ matrix.java-version != '11' }}
+        if: ${{ matrix.java-version == '17' }}
         run: ./gradlew spotlessCheck --scan
 
       - name: Build
@@ -84,7 +61,7 @@ jobs:
         run: ./gradlew jmh
 
       - name: Cache Bazel stuff
-        if: ${{ matrix.java-version == '11' }}
+        if: ${{ matrix.java-version == '17' }}
         uses: actions/cache@v4
         with:
           path: |
@@ -93,7 +70,7 @@ jobs:
           restore-keys: bazel-
 
       - name: Conformance tests
-        if: ${{ matrix.java-version == '11' }}
+        if: ${{ matrix.java-version == '17' }}
         run: conformance/run-conformance-tests.sh
 
       - name: Capture test results

buildSrc/src/main/kotlin/Testing.kt

@@ -16,34 +16,11 @@
 
 import org.gradle.api.Project
 import org.gradle.api.tasks.testing.Test
-import org.gradle.jvm.toolchain.JavaLanguageVersion
-import org.gradle.jvm.toolchain.JavaToolchainService
-import org.gradle.kotlin.dsl.register
 import org.gradle.kotlin.dsl.withType
 
 fun Project.nessieConfigureTestTasks() {
   tasks.withType<Test>().configureEach {
     useJUnitPlatform {}
     maxParallelForks = Runtime.getRuntime().availableProcessors()
   }
-
-  if (project.hasProperty("alsoTestAgainstJava8")) {
-    val javaToolchains = extensions.findByType(JavaToolchainService::class.java)
-    if (javaToolchains != null) {
-      val testWithJava8 =
-        tasks.register<Test>("testWithJava8") {
-          group = "verification"
-          description = "Run unit tests against Java 8"
-
-          dependsOn("test")
-
-          useJUnitPlatform {}
-          maxParallelForks = Runtime.getRuntime().availableProcessors()
-          javaLauncher.set(
-            javaToolchains.launcherFor { languageVersion.set(JavaLanguageVersion.of(8)) }
-          )
-        }
-      tasks.named("check") { dependsOn(testWithJava8) }
-    }
-  }
 }

settings.gradle.kts

@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+if (!JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17)) {
+  throw GradleException("Build requires Java 17")
+}
+
 val baseVersion = file("version.txt").readText().trim()
 
 pluginManagement {