Update to Gradle 9.1.0 (#295)

* Update to Gradle 9.1.0

This is to be consistent with the exercism/java-test-runner#171 which
updated the test runner to use Gradle 9.1.0.

* Update shadow Gradle plugin

Updating the shadow Gradle plugin to work with Gradle 9.0.

See https://github.com/GradleUp/shadow for Gradle compatibility.

* Update mainClassName property

This is required to work with Gradle 9. The mainClassName property
was deprecated back in Gradle 8.

See https://docs.gradle.org/current/userguide/upgrading_version_7.html#javaapplication_api_cleanup

* Add JUnit platform launcher

This is required to work with Gradle 9.

The automatic loading of test framework implementation was removed
back in Gradle 8, so it now has to be specified as a test runtime
dependency.

See also https://docs.gradle.org/8.7/userguide/upgrading_version_8.html#test_framework_implementation_dependencies

Author: kahgoh

Dockerfile

@@ -1,4 +1,4 @@
-FROM gradle:8.7-jdk21 AS build
+FROM gradle:9.1.0-jdk25 AS build
 
 WORKDIR /app
 COPY --chown=gradle:gradle . /app

build.gradle

@@ -2,13 +2,16 @@ plugins {
     id "java"
     id "application"
     id "jacoco"
-    id "com.github.johnrengelman.shadow" version "8.1.1"
+    id 'com.gradleup.shadow' version '9.2.2'
     id "ru.vyarus.mkdocs-build" version '4.0.1'
 }
 
 group = "org.exercism"
 version = "1.0-SNAPSHOT"
-mainClassName = "analyzer.AnalyzerCli"
+
+application {
+    mainClass = "analyzer.AnalyzerCli"
+}
 
 repositories {
     mavenCentral()
@@ -22,6 +25,8 @@ dependencies {
     testImplementation "org.junit.jupiter:junit-jupiter"
     testImplementation "org.assertj:assertj-core:3.27.4"
     testImplementation "com.approvaltests:approvaltests:25.4.3"
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 shadowJar {

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME