chore: Drop JDK 8

.github/workflows/unit-tests.yml

@@ -21,7 +21,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { jdkVersion: "1.8.0",  jvmName: "temurin:1.8.0",  extraOpts: '' }
           - { jdkVersion: "1.11.0", jvmName: "temurin:1.11.0", extraOpts: '-J-XX:+UnlockExperimentalVMOptions -J-XX:+UseJVMCICompiler' }
           - { jdkVersion: "1.17.0", jvmName: "temurin:1.17.0", extraOpts: '' }
     steps:

build.sbt

@@ -198,7 +198,7 @@ lazy val `lease-kubernetes-int-test` = project
     publish / skip := true,
     libraryDependencies := Dependencies.LeaseKubernetesTest,
     version ~= (_.replace('+', '-')),
-    dockerBaseImage := "openjdk:8-jre-alpine",
+    dockerBaseImage := "docker.io/library/eclipse-temurin:17.0.8.1_1-jre",
     dockerUpdateLatest := true,
     dockerCommands := dockerCommands.value.flatMap {
         case ExecCmd("ENTRYPOINT", args @ _*) => Seq(Cmd("ENTRYPOINT", args.mkString(" ")))
@@ -207,7 +207,6 @@ lazy val `lease-kubernetes-int-test` = project
     dockerCommands ++= Seq(
         Cmd("USER", "root"),
         Cmd("RUN", "chgrp -R 0 . && chmod -R g=u ."),
-        Cmd("RUN", "/sbin/apk", "add", "--no-cache", "bash", "bind-tools", "busybox-extras", "curl", "strace"),
         Cmd("RUN", "chmod +x /opt/docker/bin/akka-lease-kubernetes-int-test")
       )
   )

integration-test/aws-api-ec2/README.md

@@ -15,7 +15,7 @@ Step 1: Launch Instances
 
 From the AWS Management Console, provision a few EC2 instances (you'll need at least 2). Recommended image: Ubuntu Server 16.04. As for the instance type, this demo app runs fine even on t1.micro instances. As for the security group, 
 for now, just select the default one and make sure you allow yourself ssh access to your instances. Once the instances are ready, 
-ssh into them - you may need to install Java 8 ( you can use this [guide](https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04)).
+ssh into them - you may need to install Java 11 ( you can use this [guide](https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04)).
 
 
 Step 2: Create IAM Role

integration-test/aws-api-ec2/src/main/resources/CloudFormation/akka-cluster.json

@@ -63,7 +63,7 @@
         "UserData": {
           "Fn::Base64": {
             "Fn::Join": ["", ["#!/bin/bash -xe\n",
-              "sudo yum install -y java-1.8.0\n",
+              "sudo yum install -y java-11-openjdk\n",
               "sudo yum remove -y java-1.7.0-openjdk\n",
               "wget ", {"Ref": "Build"}, "\n",
               "export PURPOSE=", {"Ref": "Purpose"}, "\n",
@@ -227,4 +227,4 @@
       "Description": "ASG name"
     }
   }
-}
+}

integration-test/kubernetes-api-java/pom.xml

@@ -15,9 +15,8 @@
   </licenses>
 
   <properties>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
     <encoding>UTF-8</encoding>
+    <maven.compiler.release>11</maven.compiler.release>
     <akka.version>2.8.2</akka.version>
     <akka.http.version>10.5.1</akka.http.version>
     <akka-management.version>1.2.0</akka-management.version>
@@ -74,6 +73,14 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.8.1</version>
+        <configuration>
+          <release>11</release>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
@@ -135,7 +142,7 @@
             <image>
               <name>integration-test-kubernetes-api:1.3.3.7</name>
               <build>
-                <from>openjdk:8-jre-alpine</from>
+                <from>docker.io/library/eclipse-temurin:17.0.8.1_1-jre</from>
                 <ports>
                   <port>8080</port>
                   <port>8558</port>

integration-test/kubernetes-api/build.sbt

@@ -11,10 +11,9 @@ dockerCommands :=
   }
 
 dockerExposedPorts := Seq(8080, 8558, 2552)
-dockerBaseImage := "openjdk:8-jre-alpine"
+dockerBaseImage := "docker.io/library/eclipse-temurin:17.0.8.1_1-jre"
 
 dockerCommands ++= Seq(
   Cmd("USER", "root"),
-  Cmd("RUN", "/sbin/apk", "add", "--no-cache", "bash", "bind-tools", "busybox-extras", "curl", "strace"),
   Cmd("RUN", "chgrp -R 0 . && chmod -R g=u .")
 )

integration-test/kubernetes-dns/build.sbt

@@ -10,10 +10,9 @@ dockerCommands :=
   }
 
 dockerExposedPorts := Seq(8080, 8558, 2552)
-dockerBaseImage := "openjdk:8-jre-alpine"
+dockerBaseImage := "docker.io/library/eclipse-temurin:17.0.8.1_1-jre"
 
 dockerCommands ++= Seq(
   Cmd("USER", "root"),
-  Cmd("RUN", "/sbin/apk", "add", "--no-cache", "bash", "bind-tools", "busybox-extras", "curl", "strace"),
   Cmd("RUN", "chgrp -R 0 . && chmod -R g=u .")
 )

project/Common.scala

@@ -63,14 +63,8 @@ object Common extends AutoPlugin {
       javacOptions ++= Seq(
           "-Xlint:unchecked"
         ),
-      javacOptions ++= (
-          if (isJdk8) Seq.empty
-          else Seq("--release", "8")
-        ),
-      scalacOptions ++= (
-          if (isJdk8) Seq.empty
-          else Seq("--release", "8")
-        ),
+      javacOptions ++= Seq("--release", "11"),
+      scalacOptions ++= Seq("--release", "11"),
       doc / javacOptions := Nil,
       Compile / doc / scalacOptions := scalacOptions.value ++ Seq(
           "-doc-title",
@@ -99,6 +93,10 @@ object Common extends AutoPlugin {
       sonatypeProfileName := "com.lightbend"
     )
 
-  private def isJdk8 =
-    VersionNumber(sys.props("java.specification.version")).matchesSemVer(SemanticSelector(s"=1.8"))
+  val isJdk11orHigher: Boolean = {
+    val result = VersionNumber(sys.props("java.specification.version")).matchesSemVer(SemanticSelector(">=11"))
+    if (!result)
+      throw new IllegalArgumentException("JDK 11 or higher is required")
+    result
+  }
 }

project/project-info.conf

@@ -2,7 +2,7 @@ project-info {
   version: "current"
   scala-versions: ["2.13", "3.3"]
   shared-info {
-    jdk-versions: ["Adopt OpenJDK 8 with Hotspot", "Adopt OpenJDK 11 with Hotspot"]
+    jdk-versions: ["Eclipse Temurin JDK 11", "Eclipse Temurin JDK 17"]
     snapshots: {
       url: "https://oss.sonatype.org/content/repositories/snapshots/com/lightbend/akka/management/"
       text: "Snapshots are available"