reiabreu opened a new pull request, #8893:
URL: https://github.com/apache/storm/pull/8893
## Summary
- Bumps `javaVersion` in `pom.xml` from 21 to 25
- Updates the `maven.yaml` CI build job to use JDK 25 and drops Java 21 from
the test matrix (now runs exclusively on 25)
- Updates `nightlies.yaml`, `snapshots.yaml`, and `update-license-files.yml`
to use JDK 25
## Motivation
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
`synchronized` blocks 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 every `synchronized` block to `ReentrantLock`.
This was discussed on the dev@ list as part of the 3.0.0 planning thread.
## Test plan
- [ ] CI passes on JDK 25 (maven.yaml build + test matrix)
- [ ] Nightly and snapshot workflows resolve JDK 25 via Temurin without error
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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