Upgrade to Java 21

.github/workflows/build.yml

@@ -15,11 +15,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      - name: Setup Java 19
+      - name: Setup Java 21
         uses: actions/setup-java@v3
         with:
           distribution: corretto
-          java-version: 19
+          java-version: 21
 
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
@@ -42,11 +42,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
 
-      - name: Setup Java 19
+      - name: Setup Java 21
         uses: actions/setup-java@v3
         with:
           distribution: corretto
-          java-version: 19
+          java-version: 21
 
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew

README.md

@@ -7,8 +7,8 @@ template repository for Java projects using Gradle
 
 ## Features
 
-- JDK 19 ([Amazon Corretto](https://aws.amazon.com/corretto/))
-- Gradle 7
+- JDK 21 ([Amazon Corretto](https://aws.amazon.com/corretto/))
+- Gradle 8
 - [GitHub Actions](https://github.com/features/actions) CICD
 - Automatic code formatting via [Spotless](https://github.com/diffplug/spotless)
 - Code style analysis via [Checkstyle](https://github.com/checkstyle/checkstyle)

build.gradle.kts

@@ -26,8 +26,8 @@ allprojects {
 subprojects {
   apply(plugin = "java")
   configure<JavaPluginExtension> {
-    sourceCompatibility = JavaVersion.VERSION_19
-    targetCompatibility = JavaVersion.VERSION_19
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
   }
 
   apply(plugin = "com.diffplug.spotless")
@@ -89,7 +89,7 @@ subprojects {
     }
   }
 
-  val previewFeatures = listOf("--enable-preview")
+  val previewFeatures = emptyList<String>()
   tasks.withType<JavaCompile> {
     options.compilerArgs = previewFeatures
   }