Downgrade to Java 8 ahead of v20.x release

Author: dondonz

.github/workflows/master.yml

@@ -15,9 +15,9 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 11
+      - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
-          java-version: '11.0.17'
+          java-version: '8.0.282'
       - name: build test and publish
         run: ./gradlew assemble && ./gradlew check --info && ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository -x check --info --stacktrace

.github/workflows/pull_request.yml

@@ -16,9 +16,9 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 11
+      - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
-          java-version: '11.0.17'
+          java-version: '8.0.282'
       - name: build and test
         run: ./gradlew assemble && ./gradlew check --info --stacktrace

.github/workflows/release.yml

@@ -19,9 +19,9 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 11
+      - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
-          java-version: '11.0.17'
+          java-version: '8.0.282'
       - name: build test and publish
         run: ./gradlew assemble && ./gradlew check --info && ./gradlew publishToSonatype closeAndReleaseSonatypeStagingRepository -x check --info --stacktrace

build.gradle

@@ -31,21 +31,17 @@ version = releaseVersion ? releaseVersion : getDevelopmentVersion()
 println "Building version = " + version
 group = 'com.graphql-java'
 
-if (JavaVersion.current() != JavaVersion.VERSION_11) {
-    def msg = String.format("This build must be run with Java 11 - you are running %s - gradle finds the JDK via JAVA_HOME=%s",
-            JavaVersion.current(), System.getenv("JAVA_HOME"))
-    throw new GradleException(msg)
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(8)
+    }
 }
 
-sourceCompatibility = JavaVersion.VERSION_11.toString()
-targetCompatibility = JavaVersion.VERSION_11.toString()
-
 repositories {
     mavenCentral()
     mavenLocal()
 }
 
-
 dependencies {
     compile "com.graphql-java:graphql-java:20.2"