Upgrade to Gradle 7 nightly run with JDK 16

Disable license plugin which is not compatible with Gradle 7

.github/workflows/gradle.yml

@@ -25,7 +25,7 @@ jobs:
       uses: actions/setup-java@v2-preview
       with:
         distribution: 'adopt'
-        java-version: '15'
+        java-version: '16.0.0'
     - name: Verify Gradle Wrapper
       uses: gradle/wrapper-validation-action@v1
     - name: Cache Gradle packages

build.gradle

@@ -11,7 +11,7 @@ plugins {
     id 'org.openjfx.javafxplugin'           version '0.0.9'  apply false
     id 'org.beryx.jlink'                    version '2.23.4' apply false
     id 'de.undercouch.download'             version '4.0.1'
-    id 'com.github.hierynomus.license'      version '0.15.0' apply false
+//    id 'com.github.hierynomus.license'      version '0.15.0' apply false
 }
 
 buildScan {
@@ -76,7 +76,7 @@ subprojects {
 
 apply from: 'gradle/bintray.gradle'
 apply from: 'gradle/downloadJPackage.gradle'
-apply from: 'gradle/licenseCheck.gradle'
+//apply from: 'gradle/licenseCheck.gradle'
 
 task testReport(type: TestReport) {
     destinationDir = file("$buildDir/reports/allTests")

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.2-bin.zip
-distributionSha256Sum=8de6efc274ab52332a9c820366dd5cf5fc9d35ec7078fd70c8ec6913431ee610
+distributionUrl=https\://services.gradle.org/distributions-snapshots/gradle-7.0-20210322000034+0000-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists