Update Java to 17

.github/workflows/lint-and-test-dev.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Set up java
         uses: actions/setup-java@v4
         with:
-          java-version: '8'
+          java-version: '17'
           distribution: 'corretto'
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4

.github/workflows/test-main.yml

@@ -40,7 +40,7 @@ jobs:
       fail-fast: false
       matrix:
         # LTS versions, latest version (if exists)
-        java-version: [ '8', '11', '17', '21', '24' ]
+        java-version: [ '17', '21', '24' ]
         # Minimum version, latest release version, latest pre-release version (if exists)
         kotlin: ['2.0.21', '2.1.20', '2.2.0-Beta2']
     env:

README.md

@@ -1,5 +1,11 @@
 jackson-module-kogera
 ====
+
+Since `beta-23`, newer versions of `Kotlin` and `Java` than the original have been used to validate changes for `Jackson 3.x`.  
+See #Compatibility for details.
+
+---
+
 `jackson-module-kogera` is an experimental project to develop `jackson-module-kotlin`.  
 This project has the following features compared to `jackson-module-kotlin`.
 
@@ -31,7 +37,7 @@ Details are summarized in [KogeraSpecificImplementations](./docs/KogeraSpecificI
 
 # Compatibility
 - `jackson 2.19.x`
-- `Java 8+`
+- `Java 17+`
 - `Kotlin 2.0.21+`
 
 ## About compatibility checks

build.gradle.kts

@@ -55,8 +55,8 @@ kotlin {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 }
 
 tasks {
@@ -98,11 +98,11 @@ public val kogeraVersion: Version = VersionUtil.parseVersion("$version", "$group
 
     compileKotlin {
         dependsOn.add(generateKogeraVersion)
-        compilerOptions.jvmTarget.set(JvmTarget.JVM_1_8)
+        compilerOptions.jvmTarget.set(JvmTarget.JVM_17)
     }
 
     compileTestKotlin {
-        compilerOptions.jvmTarget.set(JvmTarget.JVM_1_8)
+        compilerOptions.jvmTarget.set(JvmTarget.JVM_17)
     }
 
     test {