Support jdk 21 officially (#18624)

* try zulu 21.0.8

* add java21 to supported runtimes in java docs

* update the verify-java script to reflect no 11 support and 21 support

Author: capistrant

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jdk: [ "21.0.4" ]
+        jdk: [ "21" ]
         pattern: [ "C*", "H*,U*,V*", "N*,Q*,S*", "B*,O*,R*", "G*,J*,K*", "F*,L*,M*", "A*,D*,I*,X*,Y*,Z*", "E*,P*,T*,W*"]
     uses: ./.github/workflows/worker.yml
     with:

.github/workflows/static-checks.yml

@@ -41,8 +41,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Use JDK 21.0.4 to work around https://github.com/apache/druid/issues/17429
-        java: [ '17', '21.0.4' ]
+        java: [ '17', '21' ]
     runs-on: ubuntu-latest
     steps:
       - name: checkout branch

.github/workflows/unit-and-integration-tests-unified.yml

@@ -56,8 +56,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Use JDK 21.0.4 to work around https://github.com/apache/druid/issues/17429
-        jdk: [ '17', '21.0.4' ]
+        jdk: [ '17', '21' ]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout branch

docs/operations/java.md

@@ -27,7 +27,7 @@ a Java runtime for Druid.
 
 ## Selecting a Java runtime
 
-Druid officially supports Java 17.
+Druid officially supports Java 17 and 21.
 
 The project team recommends using an OpenJDK-based Java distribution. There are many free and actively-supported
 distributions available, including

examples/bin/verify-java

@@ -28,14 +28,14 @@ sub fail_check {
     : "No Java runtime was detected on your system.";
 
   print STDERR <<"EOT";
-Druid requires Java 11 or 17. $current_version_text
+Druid requires Java 17 or 21. $current_version_text
 
 If you believe this check is in error, or you want to proceed with a potentially
 unsupported Java runtime, you can skip this check using an environment variable:
 
   export DRUID_SKIP_JAVA_CHECK=1
 
-Otherwise, install Java 11 or 17 in one of the following locations.
+Otherwise, install Java 17 or 21 in one of the following locations.
 
   * DRUID_JAVA_HOME
   * JAVA_HOME
@@ -68,6 +68,6 @@ if ($?) {
 }
 
 # If we know it won't work, die. Otherwise hope for the best.
-if ($java_version =~ /version \"((\d+)\.(\d+).*?)\"/ && $2 != 11 && $2 != 17) {
+if ($java_version =~ /version \"((\d+)\.(\d+).*?)\"/ && $2 != 17 && $2 != 21) {
   fail_check($1);
 }