java 17 needed for main branch (#867)

* java 17 needed for main branch

* Update headers.yml

Author: pjfanning

.github/workflows/headers.yml

@@ -30,7 +30,7 @@ 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

.github/workflows/link-validator.yml

@@ -29,7 +29,6 @@ jobs:
           git fetch origin pull/${{ github.event.pull_request.number }}/merge:scratch
           git checkout scratch
 
-      # needs Java 8, see https://github.com/apache/pekko-http/pull/204#discussion_r1265279415
       - name: Setup Java 17
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:

README.md

@@ -29,7 +29,7 @@ The documentation is available at
 ## Building from Source
 
 ### Prerequisites
-- Make sure you have installed a Java Development Kit (JDK) version 8 or later.
+- Make sure you have installed a Java Development Kit (JDK) version 17 or later.
 - Make sure you have [sbt](https://www.scala-sbt.org/) installed.
 - [Graphviz](https://graphviz.gitlab.io/download/) is needed for the scaladoc generation build task, which is part of the release.
 

project/project-info.conf

@@ -3,7 +3,7 @@ project-info {
   scaladoc: "https://pekko.apache.org/api/pekko-http/"${project-info.version}"/org/apache/pekko/http/scaladsl"
   javadoc: "https://pekko.apache.org/japi/pekko-http/"${project-info.version}"/org/apache/pekko/http/javadsl"
   shared-info {
-    jdk-versions: ["OpenJDK 8", "OpenJDK 11", "OpenJDK 17", "OpenJDK 21"]
+    jdk-versions: ["OpenJDK 17", "OpenJDK 21", "OpenJDK 25"]
     snapshots: {
       url: "contributing.html#snapshots"
       text: "Snapshots are available"