[SPARK-44112][BUILD][INFRA][DOCS] Drop support for Java 8 and Java 11

.github/workflows/benchmark.yml

@@ -27,9 +27,9 @@ on:
         required: true
         default: '*'
       jdk:
-        description: 'JDK version: 8, 11, 17 or 21-ea'
+        description: 'JDK version: 17 or 21'
         required: true
-        default: '8'
+        default: '17'
       scala:
         description: 'Scala version: 2.13'
         required: true

.github/workflows/build_and_test.yml

@@ -25,7 +25,7 @@ on:
       java:
         required: false
         type: string
-        default: 8
+        default: 17
       branch:
         description: Branch to run the build against
         required: false
@@ -649,11 +649,11 @@ jobs:
         if [ -f ./dev/free_disk_space_container ]; then
           ./dev/free_disk_space_container
         fi
-    - name: Install Java 8
+    - name: Install Java 17
       uses: actions/setup-java@v3
       with:
         distribution: zulu
-        java-version: 8
+        java-version: 17
     - name: License test
       run: ./dev/check-license
     - name: Dependencies test
@@ -777,7 +777,6 @@ jobs:
       fail-fast: false
       matrix:
         java:
-          - 11
           - 17
           - 21
     runs-on: ubuntu-22.04
@@ -868,11 +867,11 @@ jobs:
         key: tpcds-coursier-${{ hashFiles('**/pom.xml', '**/plugins.sbt') }}
         restore-keys: |
           tpcds-coursier-
-    - name: Install Java 8
+    - name: Install Java 17
       uses: actions/setup-java@v3
       with:
         distribution: zulu
-        java-version: 8
+        java-version: 17
     - name: Cache TPC-DS generated data
       id: cache-tpcds-sf-1
       uses: actions/cache@v3
@@ -974,11 +973,11 @@ jobs:
         key: docker-integration-coursier-${{ hashFiles('**/pom.xml', '**/plugins.sbt') }}
         restore-keys: |
           docker-integration-coursier-
-    - name: Install Java 8
+    - name: Install Java 17
       uses: actions/setup-java@v3
       with:
         distribution: zulu
-        java-version: 8
+        java-version: 17
     - name: Run tests
       run: |
         ./dev/run-tests --parallelism 1 --modules docker-integration-tests --included-tags org.apache.spark.tags.DockerTest

.github/workflows/build_ansi.yml

@@ -17,7 +17,7 @@
 # under the License.
 #
 
-name: "Build / ANSI (master, Hadoop 3, JDK 8, Scala 2.13)"
+name: "Build / ANSI (master, Hadoop 3, JDK 17, Scala 2.13)"
 
 on:
   schedule:
@@ -31,7 +31,7 @@ jobs:
     uses: ./.github/workflows/build_and_test.yml
     if: github.repository == 'apache/spark'
     with:
-      java: 8
+      java: 17
       branch: master
       hadoop: hadoop3
       envs: >-

.github/workflows/build_coverage.yml

@@ -17,7 +17,7 @@
 # under the License.
 #
 
-name: "Build / Coverage (master, Scala 2.13, Hadoop 3, JDK 8)"
+name: "Build / Coverage (master, Scala 2.13, Hadoop 3, JDK 17)"
 
 on:
   schedule:
@@ -31,7 +31,7 @@ jobs:
     uses: ./.github/workflows/build_and_test.yml
     if: github.repository == 'apache/spark'
     with:
-      java: 8
+      java: 17
       branch: master
       hadoop: hadoop3
       envs: >-

.github/workflows/build_rockdb_as_ui_backend.yml

@@ -17,7 +17,7 @@
 # under the License.
 #
 
-name: "Build / RocksDB as UI Backend (master, Hadoop 3, JDK 8, Scala 2.13)"
+name: "Build / RocksDB as UI Backend (master, Hadoop 3, JDK 17, Scala 2.13)"
 
 on:
   schedule:
@@ -31,7 +31,7 @@ jobs:
     uses: ./.github/workflows/build_and_test.yml
     if: github.repository == 'apache/spark'
     with:
-      java: 8
+      java: 17
       branch: master
       hadoop: hadoop3
       envs: >-

.github/workflows/publish_snapshot.yml

@@ -47,11 +47,18 @@ jobs:
         key: snapshot-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           snapshot-maven-
-    - name: Install Java 8
+    - name: Install Java 8 for branch-3.x
+      if: matrix.branch == 'branch-3.5' || matrix.branch == 'branch-3.4' || matrix.branch == 'branch-3.3'
       uses: actions/setup-java@v3
       with:
         distribution: temurin
         java-version: 8
+    - name: Install Java 17
+      if: matrix.branch != 'branch-3.5' && matrix.branch != 'branch-3.4' && matrix.branch != 'branch-3.3'
+      uses: actions/setup-java@v3
+      with:
+        distribution: temurin
+        java-version: 17
     - name: Publish snapshot
       env:
         ASF_USERNAME: ${{ secrets.NEXUS_USER }}

docs/building-spark.md

@@ -27,7 +27,7 @@ license: |
 ## Apache Maven
 
 The Maven-based build is the build of reference for Apache Spark.
-Building Spark using Maven requires Maven 3.9.4 and Java 8/11/17.
+Building Spark using Maven requires Maven 3.9.4 and Java 17.
 Spark requires Scala 2.13; support for Scala 2.12 was removed in Spark 4.0.0.
 
 ### Setting up Maven's Memory Usage

docs/index.md

@@ -34,12 +34,11 @@ source, visit [Building Spark](building-spark.html).
 
 Spark runs on both Windows and UNIX-like systems (e.g. Linux, Mac OS), and it should run on any platform that runs a supported version of Java. This should include JVMs on x86_64 and ARM64. It's easy to run locally on one machine --- all you need is to have `java` installed on your system `PATH`, or the `JAVA_HOME` environment variable pointing to a Java installation.
 
-Spark runs on Java 8/11/17, Scala 2.13, Python 3.8+, and R 3.5+.
-Java 8 prior to version 8u371 support is deprecated as of Spark 3.5.0.
+Spark runs on Java 17, Scala 2.13, Python 3.8+, and R 3.5+.
 When using the Scala API, it is necessary for applications to use the same version of Scala that Spark was compiled for.
 For example, when using Scala 2.13, use Spark compiled for 2.13, and compile code/applications for Scala 2.13 as well.
 
-For Java 11, setting `-Dio.netty.tryReflectionSetAccessible=true` is required for the Apache Arrow library. This prevents the `java.lang.UnsupportedOperationException: sun.misc.Unsafe or java.nio.DirectByteBuffer.(long, int) not available` error when Apache Arrow uses Netty internally.
+For Java 17, setting `-Dio.netty.tryReflectionSetAccessible=true` is required for the Apache Arrow library. This prevents the `java.lang.UnsupportedOperationException: sun.misc.Unsafe or java.nio.DirectByteBuffer.(long, int) not available` error when Apache Arrow uses Netty internally.
 
 # Running the Examples and Shell
 

pom.xml

@@ -112,7 +112,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <java.version>1.8</java.version>
+    <java.version>17</java.version>
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
     <maven.version>3.9.4</maven.version>
@@ -2934,7 +2934,7 @@
               <arg>-deprecation</arg>
               <arg>-feature</arg>
               <arg>-explaintypes</arg>
-              <arg>-target:jvm-1.8</arg>
+              <arg>-target:17</arg>
               <arg>-Wconf:cat=deprecation:wv,any:e</arg>
               <arg>-Wunused:imports</arg>
               <!--

project/SparkBuild.scala

@@ -340,7 +340,7 @@ object SparkBuild extends PomBuild {
     ),
 
     (Compile / scalacOptions) ++= Seq(
-      s"-target:jvm-${javaVersion.value}",
+      s"-target:${javaVersion.value}",
       "-sourcepath", (ThisBuild / baseDirectory).value.getAbsolutePath  // Required for relative source links in scaladoc
     ),