Java 17 build

.github/workflows/build-test.yml

@@ -30,11 +30,11 @@ jobs:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0
 
-      - name: Setup Java 11
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9
@@ -57,11 +57,11 @@ jobs:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9
@@ -81,7 +81,7 @@ jobs:
       fail-fast: false
       matrix:
         SCALA_VERSION: [2.12.20, 2.13.16, 3.3.6]
-        JAVA_VERSION: [8, 11, 17, 21]
+        JAVA_VERSION: [17, 21]
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -126,11 +126,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9
@@ -158,11 +158,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9
@@ -217,11 +217,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9
@@ -266,11 +266,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Setup Java 11
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9

.github/workflows/headers.yml

@@ -30,11 +30,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9

.github/workflows/link-validator.yml

@@ -26,11 +26,11 @@ jobs:
           # fetch everything https://github.com/actions/checkout#fetch-all-history-for-all-tags-and-branches
           fetch-depth: 0
 
-      - name: Setup Java 11
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9

.github/workflows/nightly-snapshot-dependency-test.yml

@@ -25,11 +25,11 @@ jobs:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8    
+          java-version: 17    
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9

.github/workflows/publish-nightly.yml

@@ -25,11 +25,11 @@ jobs:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0
 
-      - name: Setup Java 8
+      - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: temurin
-          java-version: 8    
+          java-version: 17    
 
       - name: Install sbt
         uses: sbt/setup-sbt@6c68d2fe8dfbc0a0534d70101baa2e0420e1a506 # v1.1.9

.scala-steward.conf

@@ -6,12 +6,6 @@ updates.pin = [
   # https://github.com/akka/akka-grpc/issues/1506
   { groupId = "org.eclipse.jgit", artifactId = "org.eclipse.jgit", version = "5." },
 
-  # Pin logback to v1.3.x because v1.4.x needs JDK11
-  { groupId = "ch.qos.logback", version="1.3." }
-
-  # Pin sbt-paradox to v0.9.x because 0.10.x needs JDK 11
-  { groupId = "com.lightbend.paradox", artifactId = "sbt-paradox-project-info", version = "0.9." },
-  { groupId = "com.lightbend.paradox", artifactId = "sbt-paradox", version = "0.9." }
   # Pin sbt-java-formatter to v0.9.x because 0.10.x needs JDK 11
   { groupId = "com.lightbend.sbt", artifactId = "sbt-java-formatter", version = "0.9." }
 

CONTRIBUTING.md

@@ -41,7 +41,7 @@ Pull Request validation states:
 
 gRPC runs on HTTP/2 and connections commonly use HTTPS.
 
-If you are running on JDK 8, you will need to use at least version 1.8.0u251 to make sure ALPN protocol negotiation is available.  
+Main branch now targets Java 17 as the minimum supported version.
 
 # Pekko gRPC contributing guidelines
 

README.md

@@ -50,11 +50,6 @@ The project is split up in a number of subprojects:
 Additionally, 'plugin-tester-java' and 'plugin-tester-scala' contain an example
 project in Java and Scala respectively, with both sbt and Gradle configurations.
 
-## Compatibility & support
-
-If used with JDK 8 prior to version 1.8.0_251 you must add an ALPN agent.
-See the note in the [Akka HTTP docs](https://doc.akka.io/docs/akka-http/10.1/server-side/http2.html#application-layer-protocol-negotiation-alpn-).
-
 ## Building from Source
 
 ### Prerequisites

docs/src/main/paradox/client/walkthrough.md

@@ -49,8 +49,8 @@ Maven
   <artifactId>my-grpc-app</artifactId>
   <version>0.1-SNAPSHOT</version>
   <properties>
-      <maven.compiler.source>1.8</maven.compiler.source>
-      <maven.compiler.target>1.8</maven.compiler.target>
+      <maven.compiler.source>17</maven.compiler.source>
+      <maven.compiler.target>17</maven.compiler.target>
       <pekko.grpc.version>$project.version$</pekko.grpc.version>
       <grpc.version>$grpc.version$</grpc.version>
       <project.encoding>UTF-8</project.encoding>

docs/src/main/paradox/deploy.md

@@ -8,8 +8,6 @@ Remember that the cleartext HTTP/2 "h2c with prior knowledge" protocol is not co
 
 To deploy your gRPC service over a HTTPS connection you will have to use an @apidoc[HttpsConnectionContext] as described in the @extref[Pekko-HTTP documentation](pekko-http:server-side/server-https-support.html).
 
-When using HTTPS and running your application on a JDK 8 prior to version 1.8.0_251 you also need to provide an external ALPN implementation. Follow the @extref[section on ALPN](pekko-http:server-side/http2.html#application-layer-protocol-negotiation-alpn-) in the Pekko-HTTP docs for more details.
-
 ## Example: Kubernetes
 
 As an example, [pekko-grpc-sample-kubernetes-scala](https://pekko.apache.org/docs/pekko-samples/current/pekko-sample-grpc-kubernetes-scala/) is a complete project consisting of two applications (a gRPC service and an HTTP service that consumes the gRPC service) that can be deployed together in Kubernetes.

docs/src/main/paradox/server/walkthrough.md

@@ -56,8 +56,8 @@ Maven
       <artifactId>my-grpc-app</artifactId>
       <version>0.1-SNAPSHOT</version>
       <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
         <pekko.grpc.version>$project.version$</pekko.grpc.version>
         <grpc.version>$grpc.version$</grpc.version>
         <project.encoding>UTF-8</project.encoding>
@@ -222,9 +222,6 @@ methods to create partial functions that are combined by `concatOrNotFound`.]
 
 ## Running the server
 
-To run the server with HTTP/2 using HTTPS on a JVM prior to version 1.8.0_251, you will likely have to configure the Jetty ALPN
-agent as described @extref[in the Pekko HTTP documentation](pekko-http:server-side/http2.html#application-layer-protocol-negotiation-alpn-). Later JVM versions have this support built-in.
-
 See the detailed chapters on @ref[sbt](../buildtools/sbt.md#starting-your-pekko-grpc-server-from-sbt), @ref[Gradle](../buildtools/gradle.md#starting-your-pekko-grpc-server-from-gradle)
 and @ref[Maven](../buildtools/maven.md#starting-your-pekko-grpc-server-from-maven) for details on adding the agent.
 

plugin-tester-java/pom.xml

@@ -20,8 +20,8 @@
   <version>0.1-SNAPSHOT</version>
 
   <properties>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>17</maven.compiler.source>
+    <maven.compiler.target>17</maven.compiler.target>
     <maven-dependency-plugin.version>3.8.1</maven-dependency-plugin.version>
     <maven-exec-plugin.version>3.5.1</maven-exec-plugin.version>
     <pekko.http.version>1.2.0</pekko.http.version>

plugin-tester-scala/pom.xml

@@ -20,8 +20,8 @@
   <version>0.1-SNAPSHOT</version>
 
   <properties>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>17</maven.compiler.source>
+    <maven.compiler.target>17</maven.compiler.target>
     <pekko.version>1.1.5</pekko.version>
     <pekko.http.version>1.2.0</pekko.http.version>
     <grpc.version>1.75.0</grpc.version> <!-- checked synced by VersionSyncCheckPlugin -->

project/plugins.sbt

@@ -30,8 +30,9 @@ addSbtPlugin("com.github.pjfanning" % "sbt-source-dist" % "0.1.12")
 addSbtPlugin("com.github.sbt" % "sbt-license-report" % "1.7.0")
 
 addSbtPlugin("org.apache.pekko" % "pekko-sbt-paradox" % "1.0.1")
-addSbtPlugin(("com.github.sbt" % "sbt-site-paradox" % "1.7.0").excludeAll(
-  "com.lightbend.paradox", "sbt-paradox"))
+addSbtPlugin("com.github.sbt" % "sbt-site-paradox" % "1.7.0")
+addSbtPlugin("com.lightbend.paradox" % "sbt-paradox-theme" % "0.10.7")
+addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % "0.10.7")
 
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.6.0")
 

project/project-info.conf

@@ -3,7 +3,7 @@
 project-info {
   version: "current"
   shared-info {
-    jdk-versions: ["OpenJDK 8", "OpenJDK 11", "OpenJDK 17", "OpenJDK 21"]
+    jdk-versions: ["OpenJDK 17", "OpenJDK 21"]
     snapshots: {
       url: "https://repository.apache.org/content/groups/snapshots/org/apache/pekko/"
       text: "Snapshots are available from Apache Snapshots Repository"

runtime/src/main/scala/org/apache/pekko/grpc/GrpcClientSettings.scala

@@ -225,8 +225,7 @@ final class GrpcClientSettings private (
     Option(sslProvider).fold(this)(sslProvider => copy(useTls = true, sslProvider = Some(sslProvider)))
 
   /**
-   * Prefer using `withContextManager`: withSslContext forces the ssl-provider 'jdk', which is known
-   * not to work on JDK 1.8.0_252.
+   * Prefer using `withContextManager`: withSslContext forces the ssl-provider 'jdk'.
    */
   def withSslContext(sslContext: SSLContext): GrpcClientSettings =
     Option(sslContext).fold(this)(sslContext => copy(useTls = true, sslContext = Option(sslContext)))

runtime/src/main/scala/org/apache/pekko/grpc/internal/NettyClientUtils.scala

@@ -187,8 +187,7 @@ object NettyClientUtils {
     import java.lang.reflect.Field
 
     // This is a hack for situations where the SSLContext is given.
-    // This approach forces using SslProvider.JDK, which is known not to work
-    // on JDK 1.8.0_252
+    // This approach forces using SslProvider.JDK.
 
     // Create a Netty JdkSslContext object with all the correct ciphers, protocol settings, etc initialized.
     val nettySslContext: JdkSslContext =