Bump minimum required Java version to 21 (#12753)

Co-authored-by: ChrisHegarty <chegar999@gmail.com>
Co-authored-by: Dawid Weiss <dawid.weiss@carrotsearch.com>
Co-authored-by: Robert Muir <rmuir@apache.org>

Author: 4 people

.github/actions/prepare-for-build/action.yml

@@ -6,7 +6,7 @@ name: Prepare Lucene build
 inputs:
    java-version:
      required: false
-     default: 17
+     default: 21
      description: "The default JDK version to set up."
 
    java-distribution:

.github/workflows/distribution.yml

@@ -29,7 +29,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        java: [ '17' ]
+        java: [ '21' ]
 
     runs-on: ${{ matrix.os }}
 
@@ -52,7 +52,7 @@ jobs:
         # windows-latest: fairly slow to build and results in odd errors (see LUCENE-10167)
         # macos-latest: a tad slower than ubuntu and pretty much the same (?) so leaving out.
         os: [ ubuntu-latest ]
-        java: [ '17' ]
+        java: [ '21' ]
 
     runs-on: ${{ matrix.os }}
 

.github/workflows/run-checks-all.yml

@@ -39,7 +39,7 @@ comprehensive documentation, visit:
 
 ### Basic steps:
 
-1. Install OpenJDK 17 or 18.
+1. Install OpenJDK 21.
 2. Clone Lucene's git repository (or download the source distribution).
 3. Run gradle launcher script (`gradlew`).
 

README.md

@@ -73,7 +73,7 @@ ext {
   }
 
   // Minimum Java version required to compile and run Lucene.
-  minJavaVersion = JavaVersion.VERSION_17
+  minJavaVersion = JavaVersion.VERSION_21
 
   // snapshot build marker used in scripts.
   snapshotBuild = version.contains("SNAPSHOT")

build.gradle

@@ -21,7 +21,7 @@ repositories {
 
 ext {
   // Minimum Java version required to compile buildSrc.
-  minJavaVersion = JavaVersion.VERSION_17
+  minJavaVersion = JavaVersion.VERSION_21
 }
 
 

buildSrc/build.gradle

@@ -55,8 +55,8 @@ public static void main(String[] args) {
 
   public static void checkVersion() {
     int major = Runtime.version().feature();
-    if (major < 17 || major > 21) {
-      throw new IllegalStateException("java version must be between 17 and 21, your version: " + major);
+    if (major != 21) {
+      throw new IllegalStateException("java version must be 21, your version: " + major);
     }
   }
 

buildSrc/src/main/java/org/apache/lucene/gradle/WrapperDownloader.java

@@ -66,7 +66,7 @@
 from scriptutil import BranchType, Version, download, run
 
 # Lucene-to-Java version mapping
-java_versions = {6: 8, 7: 8, 8: 8, 9: 11, 10: 17}
+java_versions = {6: 8, 7: 8, 8: 8, 9: 11, 10: 21}
 editor = None
 
 # Edit this to add other global jinja2 variables or filters

dev-tools/scripts/releaseWizard.py

@@ -39,7 +39,7 @@
 from collections import namedtuple
 import scriptutil
 
-BASE_JAVA_VERSION = "17"
+BASE_JAVA_VERSION = "21"
 
 # This tool expects to find /lucene off the base URL.  You
 # must have a working gpg, tar, unzip in your path.  This has been

dev-tools/scripts/smokeTestRelease.py

@@ -102,5 +102,5 @@ tests.jvms=@TEST_JVMS@
 org.gradle.java.installations.auto-download=true
 
 # Set these to enable automatic JVM location discovery.
-org.gradle.java.installations.fromEnv=JAVA17_HOME,JAVA19_HOME,JAVA20_HOME,JAVA21_HOME,JAVA22_HOME,RUNTIME_JAVA_HOME
+org.gradle.java.installations.fromEnv=JAVA21_HOME,JAVA22_HOME,RUNTIME_JAVA_HOME
 #org.gradle.java.installations.paths=(custom paths)