Bump Java baseline to 25 on master#8893
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Move master off Java 21 and onto Java 25 (LTS) as the exclusive build and test JDK. The main motivation is JEP 491, which landed in Java 24 and is carried into the 25 LTS: virtual threads no longer pin their carrier when blocking inside a synchronized block, removing a key constraint on adopting VTs in Storm's I/O-bound paths. Changes: - pom.xml: javaVersion 21 → 25 - maven.yaml: build job uses JDK 25; test matrix drops 21, keeps only 25 - nightlies.yaml, snapshots.yaml, update-license-files.yml: JDK 21 → 25 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
javaVersioninpom.xmlfrom 21 to 25maven.yamlCI build job to use JDK 25 and drops Java 21 from the test matrix (now runs exclusively on 25)nightlies.yaml,snapshots.yaml, andupdate-license-files.ymlto use JDK 25Motivation
Java 25 is the next LTS after 21. The key driver is JEP 491 ("Synchronize Virtual Threads without Pinning"), delivered in Java 24 and carried into the 25 LTS. Before this fix, virtual threads blocked inside
synchronizedblocks would pin their carrier thread — under load this could exhaust the carrier pool. On Java 25 the VT unmounts cleanly while waiting, which removes the main blocker for adopting virtual threads in Storm's I/O-bound paths (Netty transport, bolt external calls, ZK/Nimbus heartbeat paths) without first rewriting everysynchronizedblock toReentrantLock.This was discussed on the dev@ list as part of the 3.0.0 planning thread.
Test plan
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