Upgrade build system to Gradle 9.2.1

This means using Java 17 for the build. The artifacts produced are still Java 8.

Author: tsjensen

.github/workflows/build.yml

@@ -10,24 +10,45 @@ jobs:
     build:
         runs-on: ubuntu-latest
         container:
-            image: gradle:8.14.3-jdk8
+            image: gradle:9.2.1-jdk17
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v6
               with:
                   fetch-depth: 0
+                  fetch-tags: true
+
+            - name: 'save-env'
+              run: |
+                  echo "SAVE_JAVA_HOME=${JAVA_HOME}" >> "$GITHUB_ENV"
+                  echo "SAVE_PATH=${PATH}" >> "$GITHUB_ENV"
+
+            - name: 'add-jdk8'
+              uses: actions/setup-java@v5
+              with:
+                  distribution: temurin
+                  java-version: 8
 
             - name: versions
               run: |
+                  export JAVA_HOME=$SAVE_JAVA_HOME
+                  echo JAVA_HOME=${JAVA_HOME}
+                  export PATH=$SAVE_PATH
                   echo PATH=${PATH}
                   git --version
-                  echo JAVA_HOME=${JAVA_HOME}
+                  echo '---'
                   java -version
-                  gradle --version
-                  gradle javaToolchains
+                  echo '---'
+                  ${JAVA_HOME_8_X64}/bin/java -version
+                  echo '---'
+                  export EXTRA_JDKS="-Porg.gradle.java.installations.paths=${JAVA_HOME_8_X64}"
+                  echo "EXTRA_JDKS=${EXTRA_JDKS}" >> "$GITHUB_ENV"
+                  gradle ${EXTRA_JDKS} javaToolchains
 
             - name: build
               run: |
-                  gradle --warning-mode all clean build
+                  export JAVA_HOME=$SAVE_JAVA_HOME
+                  export PATH=$SAVE_PATH
+                  gradle ${EXTRA_JDKS} --warning-mode all clean build
 
             - name: codecov
               uses: codecov/codecov-action@v5

README.md

@@ -77,8 +77,9 @@ The output format will always be the current version of the format.
 
 In order to build this library on your local PC, and/or contribute to this library, mind the following prerequisites:
 
-1. **Java** - make sure [JDK 8](https://adoptium.net/temurin/releases/?version=8) is available on your system, and
-   the `JAVA_HOME` environment variable points to it.
+1. **Java** - make sure both [JDK 8](https://adoptium.net/temurin/releases/?version=8) and
+   [JDK 17](https://adoptium.net/temurin/releases/?version=17) are available on your system. The `JAVA_HOME`
+   environment variable should point to the JDK17, because it is used by Gradle. JDK8 is needed for compilation.
 
 2. **Gradle** - We use the Gradle Wrapper, so there is nothing to install.
 

build.gradle

@@ -12,8 +12,8 @@ plugins {
     id 'signing'
     id 'maven-publish'
     id 'org.ajoberstar.grgit' version '4.1.1'
-    id 'org.barfuin.gradle.jacocolog' version '3.1.0'
-    id 'org.barfuin.gradle.taskinfo' version '2.2.1'
+    id 'org.barfuin.gradle.jacocolog' version '4.0.0'
+    id 'org.barfuin.gradle.taskinfo' version '3.0.1'
 }
 
 repositories {
@@ -67,14 +67,14 @@ project.gradle.taskGraph.whenReady { taskGraph ->
  * - - - -  DEPENDENCIES  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  */
 dependencies {
-    compileOnly group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
-    api group: 'org.cyclonedx', name: 'cyclonedx-core-java', version: '11.0.1'
-    implementation group: 'org.slf4j', name: 'slf4j-api', version: '2.0.17'
-
-    testCompileOnly group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
-    testImplementation group: 'junit', name: 'junit', version: '4.13.2'
-    testImplementation group: 'commons-io', name: 'commons-io'
-    testRuntimeOnly group: 'org.apache.logging.log4j', name: 'log4j-slf4j2-impl', version: '2.25.3'
+    compileOnly 'com.google.code.findbugs:jsr305:3.0.2'
+    api 'org.cyclonedx:cyclonedx-core-java:11.0.1'
+    implementation 'org.slf4j:slf4j-api:2.0.17'
+
+    testCompileOnly 'com.google.code.findbugs:jsr305:3.0.2'
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation 'commons-io:commons-io'
+    testRuntimeOnly 'org.apache.logging.log4j:log4j-slf4j2-impl:2.25.3'
 }
 
 
@@ -242,7 +242,7 @@ tasks.named('javadoc').configure {
     // workaround for JDK 9+: https://github.com/gradle/gradle/issues/11182
     def currentJavaVersion = JavaVersion.current()
     if (currentJavaVersion >= JavaVersion.VERSION_1_9) {
-        options.addStringOption("-release", "8")
+        options.addStringOption("source", "8")
     }
 }
 
@@ -263,7 +263,7 @@ project.extensions.findByName('checkstyle').sourceSets.each { SourceSet s ->
 
 dependencies {
     checkstyle "com.puppycrawl.tools:checkstyle:${project.extensions.checkstyle.toolVersion}"
-    checkstyle group: 'com.github.sevntu-checkstyle', name: 'sevntu-checks', version: '1.37.0'
+    checkstyle 'com.github.sevntu-checkstyle:sevntu-checks:1.37.0'
 }
 
 

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME