build: allow to change java toolchain for build and tests

.github/workflows/build-artifacts.yml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 21
 
       - name: Set jadx version
         run: |
@@ -29,6 +29,8 @@ jobs:
 
       - name: Build
         run: ./gradlew dist distWin
+        env:
+          JADX_BUILD_JAVA_VERSION: 11
 
       - name: Save bundle artifact
         uses: actions/upload-artifact@v4

.github/workflows/build-test.yml

@@ -20,10 +20,13 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 21
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
       - name: Build
         run: ./gradlew build dist distWin
+        env:
+          JADX_BUILD_JAVA_VERSION: 11
+

build.gradle.kts

@@ -15,6 +15,18 @@ val jadxVersion by extra { System.getenv("JADX_VERSION") ?: "dev" }
 println("jadx version: $jadxVersion")
 version = jadxVersion
 
+val jadxBuildJavaVersion by extra { getBuildJavaVersion() }
+
+fun getBuildJavaVersion(): Int? {
+	val envVarName = "JADX_BUILD_JAVA_VERSION"
+	val buildJavaVer = System.getenv(envVarName)?.toInt() ?: return null
+	if (buildJavaVer < 11) {
+		throw GradleException("'$envVarName' can't be set to lower than 11")
+	}
+	println("Set Java toolchain for jadx build to version '$buildJavaVer'")
+	return buildJavaVer
+}
+
 allprojects {
 	apply(plugin = "java")
 	apply(plugin = "checkstyle")

buildSrc/src/main/kotlin/jadx-java.gradle.kts

@@ -8,6 +8,7 @@ plugins {
 }
 
 val jadxVersion: String by rootProject.extra
+val jadxBuildJavaVersion: Int? by rootProject.extra
 
 group = "io.github.skylot"
 version = jadxVersion
@@ -32,6 +33,11 @@ repositories {
 }
 
 java {
+	jadxBuildJavaVersion?.let { buildJavaVer ->
+		toolchain {
+			languageVersion = JavaLanguageVersion.of(buildJavaVer)
+		}
+	}
 	sourceCompatibility = JavaVersion.VERSION_11
 	targetCompatibility = JavaVersion.VERSION_11
 }

jadx-core/build.gradle.kts

@@ -24,10 +24,31 @@ dependencies {
 	testImplementation("tools.profiler:async-profiler:3.0")
 }
 
-tasks.test {
+val jadxTestJavaVersion = getTestJavaVersion()
-	exclude("**/tmp/*")
+
+fun getTestJavaVersion(): Int? {
+	val envVarName = "JADX_TEST_JAVA_VERSION"
+	val testJavaVer = System.getenv(envVarName)?.toInt() ?: return null
+	val currentJavaVer = java.toolchain.languageVersion.get().asInt()
+	if (testJavaVer < currentJavaVer) {
+		throw GradleException("'$envVarName' can't be set to lower version than $currentJavaVer")
+	}
+	println("Set Java toolchain for core tests to version '$testJavaVer'")
+	return testJavaVer
+}
+
+tasks.named<Test>("test") {
+	jadxTestJavaVersion?.let { testJavaVer ->
+		javaLauncher =
+			javaToolchains.launcherFor {
+				languageVersion = JavaLanguageVersion.of(testJavaVer)
+			}
+	}
 
 	// disable cache to allow test's rerun,
 	// because most tests are integration and depends on plugins and environment
 	outputs.cacheIf { false }
+
+	// exclude temp tests
+	exclude("**/tmp/*")
 }

settings.gradle.kts

@@ -1,9 +1,13 @@
-rootProject.name = "jadx"
+plugins {
+	id("org.gradle.toolchains.foojay-resolver-convention") version ("0.8.0")
+}
 
 if (!JavaVersion.current().isJava11Compatible) {
 	throw GradleException("Jadx requires at least Java 11 for build (current version is '${JavaVersion.current()}')")
 }
 
+rootProject.name = "jadx"
+
 include("jadx-core")
 include("jadx-cli")
 include("jadx-gui")