Downgrade to Java 8

Closes gh-761

.github/workflows/continuous-integration-workflow.yml

@@ -34,7 +34,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        jdk: [11]
+        jdk: [8,11,17]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     if: needs.prerequisites.outputs.runjobs
@@ -70,7 +70,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 8
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
       - name: Snapshot Tests
@@ -90,7 +90,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 8
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
       - name: Deploy Artifacts
@@ -114,7 +114,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 8
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2
       - name: Deploy Docs

README.adoc

@@ -52,9 +52,9 @@ In the instructions below, https://vimeo.com/34436402[`./gradlew`] is invoked fr
 a cross-platform, self-contained bootstrap mechanism for the build.
 
 === Prerequisites
-https://help.github.com/set-up-git-redirect[Git] and the https://www.oracle.com/technetwork/java/javase/downloads[JDK11 build].
+https://help.github.com/set-up-git-redirect[Git] and the https://www.oracle.com/technetwork/java/javase/downloads[JDK8 build].
 
-Be sure that your `JAVA_HOME` environment variable points to the `jdk11` folder extracted from the JDK download.
+Be sure that your `JAVA_HOME` environment variable points to the `jdk1.8.0` folder extracted from the JDK download.
 
 === Check out sources
 [indent=0]

buildSrc/build.gradle

@@ -4,7 +4,7 @@ plugins {
 	id "groovy"
 }
 
-sourceCompatibility = JavaVersion.VERSION_11
+sourceCompatibility = JavaVersion.VERSION_1_8
 
 repositories {
 	gradlePluginPortal()

buildSrc/src/main/java/org/springframework/gradle/SpringJavaPlugin.java

@@ -73,14 +73,13 @@ public class SpringJavaPlugin implements Plugin<Project> {
 
 		// Apply Java source compatibility version
 		JavaPluginExtension java = project.getExtensions().getByType(JavaPluginExtension.class);
-		java.setTargetCompatibility(JavaVersion.VERSION_11);
+		java.setTargetCompatibility(JavaVersion.VERSION_1_8);
 
 		// Configure Java tasks
 		project.getTasks().withType(JavaCompile.class, (javaCompile) -> {
 			CompileOptions options = javaCompile.getOptions();
 			options.setEncoding("UTF-8");
 			options.getCompilerArgs().add("-parameters");
-			options.getRelease().set(11);
 		});
 		project.getTasks().withType(Jar.class, (jar) -> jar.manifest((manifest) -> {
 			Map<String, String> attributes = new HashMap<>();

buildSrc/src/main/java/org/springframework/gradle/docs/SpringJavadocApiPlugin.java

@@ -54,7 +54,7 @@ public class SpringJavadocApiPlugin implements Plugin<Project> {
 		api.doLast(new Action<Task>() {
 			@Override
 			public void execute(Task task) {
-				if (JavaVersion.current().isJava11Compatible()) {
+				if (JavaVersion.current().isJava8Compatible()) {
 					project.copy((copy) -> copy.from(api.getDestinationDir())
 							.into(api.getDestinationDir())
 							.include("element-list")

buildSrc/src/main/java/org/springframework/gradle/docs/SpringJavadocOptionsPlugin.java

@@ -30,8 +30,6 @@ public class SpringJavadocOptionsPlugin implements Plugin<Project> {
 		project.getTasks().withType(Javadoc.class, (javadoc) -> {
 			StandardJavadocDocletOptions options = (StandardJavadocDocletOptions) javadoc.getOptions();
 			options.addStringOption("Xdoclint:none", "-quiet");
-			// Workaround for Java 11 javadoc search bug. Can be removed with Java 17.
-			options.addBooleanOption("-no-module-directories", true);
 		});
 	}
 }

docs/src/docs/asciidoc/examples/spring-authorization-server-docs-examples.gradle

@@ -4,7 +4,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()

docs/src/docs/asciidoc/getting-started.adoc

@@ -6,7 +6,7 @@ If you are just getting started with Spring Authorization Server, the following
 [[system-requirements]]
 == System Requirements
 
-Spring Authorization Server requires a Java 11 or higher Runtime Environment.
+Spring Authorization Server requires a Java 8 or higher Runtime Environment.
 
 [[installing-spring-authorization-server]]
 == Installing Spring Authorization Server

samples/custom-consent-authorizationserver/samples-custom-consent-authorizationserver.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()

samples/default-authorizationserver/samples-default-authorizationserver.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()

samples/federated-identity-authorizationserver/samples-federated-identity-authorizationserver.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()

samples/messages-client/samples-messages-client.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()

samples/messages-resource/samples-messages-resource.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = project.rootProject.group
 version = project.rootProject.version
-sourceCompatibility = "11"
+sourceCompatibility = "1.8"
 
 repositories {
 	mavenCentral()