upgrade to gradle 6.8.3

provision/use-maven-repository-from-gradle.sh

@@ -9,10 +9,13 @@ mkdir -p tmp/use-maven-repository-from-gradle && cd tmp/use-maven-repository-fro
 # test the maven repository from gradle.
 
 # download and install gradle.
-apt-get install -y unzip
+gradle_version='6.8.3'
-wget -qO/tmp/gradle-4.2.1-bin.zip https://services.gradle.org/distributions/gradle-4.2.1-bin.zip
+if [ ! -f /opt/gradle/gradle-$gradle_version/bin/gradle ]; then
-unzip -d /opt/gradle /tmp/gradle-4.2.1-bin.zip
+    apt-get install -y unzip
-export PATH="$PATH:/opt/gradle/gradle-4.2.1/bin"
+    wget -qO/tmp/gradle-$gradle_version-bin.zip https://services.gradle.org/distributions/gradle-$gradle_version-bin.zip
+    unzip -d /opt/gradle /tmp/gradle-$gradle_version-bin.zip
+fi
+export PATH="$PATH:/opt/gradle/gradle-$gradle_version/bin"
 
 # build and upload an example library.
 mkdir gradle-greeter-library
@@ -29,13 +32,17 @@ cat >settings.gradle <<'EOF'
 rootProject.name = 'gradle-greeter'
 EOF
 cat >build.gradle <<'EOF'
-// see https://docs.gradle.org/4.2.1/userguide/java_library_plugin.html
+// see https://docs.gradle.org/6.8.3/userguide/java_library_plugin.html
-// see https://docs.gradle.org/4.2.1/userguide/maven_plugin.html
+// see https://docs.gradle.org/6.8.3/userguide/maven_plugin.html
 
-apply plugin: 'java-library'
+plugins {
-apply plugin: 'maven'
+    id 'java-library'
+    id 'maven-publish'
+}
 
+group = 'com.example'
 version = '1.0.0'
+
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -43,30 +50,36 @@ jar {
     manifest {
         attributes(
             'Implementation-Title': 'Gradle Greeter Example',
-            'Implementation-Version': version
+            'Implementation-Version': project.version
         )
     }
 }
 
-uploadArchives {
+publishing {
+    publications {
+        maven(MavenPublication) {
+            from components.java
+        }
+    }
+
     repositories {
-        mavenDeployer {
+        maven {
-            repository(url: System.env.NEXUS_REPOSITORY_URL) {
+            url System.env.NEXUS_REPOSITORY_URL
-                authentication(
+            credentials {
-                    userName: System.env.NEXUS_REPOSITORY_USERNAME,
+                username = System.env.NEXUS_REPOSITORY_USERNAME
-                    password: System.env.NEXUS_REPOSITORY_PASSWORD)
+                password = System.env.NEXUS_REPOSITORY_PASSWORD
             }
-            pom.groupId = 'com.example'
         }
     }
 }
 EOF
-gradle build
+gradle --warning-mode all build
 unzip -l build/libs/gradle-greeter-1.0.0.jar
+unzip -p build/libs/gradle-greeter-1.0.0.jar META-INF/MANIFEST.MF
 export NEXUS_REPOSITORY_URL="https://$nexus_domain/repository/maven-releases"
 export NEXUS_REPOSITORY_USERNAME='alice.doe'
 export NEXUS_REPOSITORY_PASSWORD='password'
-gradle upload
+gradle --warning-mode all publish
 popd
 
 # build an example application that uses our gradle-greeter library from our nexus repository.
@@ -84,18 +97,24 @@ cat >settings.gradle <<'EOF'
 rootProject.name = 'gradle-greeter-application'
 EOF
 cat >build.gradle <<EOF
-// see https://docs.gradle.org/4.2.1/userguide/java_plugin.html
+// see https://docs.gradle.org/6.8.3/userguide/java_plugin.html
-// see https://docs.gradle.org/4.2.1/userguide/application_plugin.html
+// see https://docs.gradle.org/6.8.3/userguide/application_plugin.html
 // see http://imperceptiblethoughts.com/shadow/
 
 plugins {
-    id 'com.github.johnrengelman.shadow' version '2.0.1'
+    id 'application'
+    id 'com.github.johnrengelman.shadow' version '6.1.0'
 }
 
-apply plugin: 'application'
+group = 'com.example'
+version = '1.0.0'
 
 mainClassName = 'Greet'
-version = '1.0.0'
+
+application {
+    mainClass = project.mainClassName
+}
+
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -103,8 +122,7 @@ jar {
     manifest {
         attributes(
             'Implementation-Title': 'Gradle Greeter Application Example',
-            'Implementation-Version': version,
+            'Implementation-Version': project.version
-            'Main-Class': mainClassName
         )
     }
 }
@@ -116,10 +134,11 @@ repositories {
 }
 
 dependencies {
-    compile 'com.example:gradle-greeter:1.0.0'
+    implementation 'com.example:gradle-greeter:1.0.0'
 }
 EOF
-gradle shadowJar
+gradle --warning-mode all shadowJar
 unzip -l build/libs/gradle-greeter-application-1.0.0-all.jar
+unzip -p build/libs/gradle-greeter-application-1.0.0-all.jar META-INF/MANIFEST.MF
 java -jar build/libs/gradle-greeter-application-1.0.0-all.jar
 popd