Revert "[SPARK-51953] Support Java 24"

This reverts commit bb43a3d.

Author: dongjoon-hyun

.github/workflows/build_and_test.yml

@@ -33,7 +33,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ 'ubuntu-latest', 'ubuntu-24.04-arm' ]
-        java-version: [ 17, 21, 24 ]
+        java-version: [ 17, 21 ]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3

build-tools/docker/Dockerfile

@@ -22,7 +22,7 @@ COPY . .
 
 RUN --mount=type=cache,target=/home/gradle/.gradle/caches gradle --no-daemon clean build -x check
 
-FROM azul/zulu-openjdk:24-jre
+FROM azul/zulu-openjdk:21-jre
 
 ARG APP_VERSION=0.1.0-SNAPSHOT
 ARG SPARK_UID=185

build-tools/helm/spark-kubernetes-operator/values.yaml

@@ -43,8 +43,6 @@ operatorDeployment:
     operatorContainer:
       jvmArgs: "-Dfile.encoding=UTF8"
       env:
-        - name: "SPARK_USER"
-          value: "spark"
       envFrom:
       volumeMounts: { }
       resources:

build.gradle

@@ -58,9 +58,6 @@ subprojects {
 
   repositories {
     mavenCentral()
-    maven {
-      url = "https://repository.apache.org/content/repositories/snapshots/"
-    }
   }
 
   apply plugin: 'checkstyle'
@@ -71,24 +68,22 @@ subprojects {
     showViolations = true
   }
 
-  if (JavaVersion.current() < JavaVersion.VERSION_24) {
-    apply plugin: 'pmd'
-    pmd {
-      ruleSetFiles = files("$rootDir/config/pmd/ruleset.xml")
-      toolVersion = libs.versions.pmd.get()
-      consoleOutput = true
-      ignoreFailures = false
-    }
+  apply plugin: 'pmd'
+  pmd {
+    ruleSetFiles = files("$rootDir/config/pmd/ruleset.xml")
+    toolVersion = libs.versions.pmd.get()
+    consoleOutput = true
+    ignoreFailures = false
+  }
 
-    apply plugin: 'com.github.spotbugs'
-    spotbugs {
-      toolVersion = libs.versions.spotbugs.tool.get()
-      afterEvaluate {
-        reportsDir = file("${project.reporting.baseDir}/findbugs")
-      }
-      excludeFilter = file("$rootDir/config/spotbugs/spotbugs_exclude.xml")
-      ignoreFailures = false
+  apply plugin: 'com.github.spotbugs'
+  spotbugs {
+    toolVersion = libs.versions.spotbugs.tool.get()
+    afterEvaluate {
+      reportsDir = file("${project.reporting.baseDir}/findbugs")
     }
+    excludeFilter = file("$rootDir/config/spotbugs/spotbugs_exclude.xml")
+    ignoreFailures = false
   }
 
   apply plugin: 'jacoco'

docs/operations.md

@@ -19,7 +19,7 @@ under the License.
 
 ### Compatibility
 
-- Java 17, 21 and 24
+- Java 17 and 21
 - Kubernetes version compatibility:
     + k8s version >= 1.30 is recommended. Operator attempts to be API compatible as possible, but
       patch support will not be performed on k8s versions that reached EOL.

gradle/libs.versions.toml

@@ -16,17 +16,17 @@
 # under the License.
 [versions]
 fabric8 = "7.2.0"
-lombok = "1.18.38"
+lombok = "1.18.32"
 operator-sdk = "4.9.0"
 okhttp = "4.12.0"
 dropwizard-metrics = "4.2.25"
-spark = "4.0.1-SNAPSHOT"
+spark = "4.0.0-preview2"
 log4j = "2.24.2"
 
 # Test
 junit = "5.10.2"
-jacoco = "0.8.13"
-mockito = "5.17.0"
+jacoco = "0.8.12"
+mockito = "5.11.0"
 powermock = "2.0.9"
 
 # Build Analysis

gradlew

@@ -210,7 +210,7 @@ fi
 
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m" "--enable-native-access=ALL-UNNAMED"'
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
 #   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,