To the best of my knowledge Kafka 4.x brokers require Java >= 17. The biggest thing to keep in mind is that Kafka 4.x clients don't support extremely old brokers
To use a Kafka 4.0 client, the server it's communicating with must be > version 2.1 or newer. *If your server is older than 2.1, a Kafka 4 client > will not work.* But now we know we can combine Storm and Java 25 with no issues :) I'll try to cast my vote during the next few days, although my test setup is very limited and the topologies I can ran are quite basic. On Thu, Oct 30, 2025, 14:59 Alexandre Vermeerbergen < [email protected]> wrote: > I have no idea: I had the idea to test with Java 25 when I saw mention > to Kafka 4.x in Storm 2.8.3's release notes, as I know Kafka 4.x is > the minimum version that supports Java 25.... > > Le jeu. 30 oct. 2025 à 15:50, Rui Abreu <[email protected]> a écrit : > > > > @[email protected] out of curiosity, shouldn't 2.8.2 work with > Java 25 as well? > > > > On Wed, 29 Oct 2025 at 19:39, Alexandre Vermeerbergen < > [email protected]> wrote: > >> > >> +1 (binding) > >> > >> tested this Storm 2.8.3 release candidate with: > >> * IBM Semeru Java 21.0.8 running on Redhat 8 with a cluster > >> Supervisor machine and distinct Zookeeper machine with 10+ topologies > >> including more than twice relying on Kafka spouts/bolts ; using Kafka > >> 4.1.0 > >> => everything works fine, no noticeable impact on performance > >> > >> * IBM Semeru Java 25.0.0 running on Redhat 8 with a cluster > >> Supervisor machine and distinct Zookeeper machine with 10+ topologies > >> including more than twice relying on Kafka spouts/bolts ; using Kafka > >> 4.1.0 > >> => likewise, everything is OK without noticeable performance changes > >> > >> This is great news to already have Java 25-runtime compatible Storm > >> shorly following Java 25 LTS availability, thanks for the great work ! > >> > >> Best regards, > >> > >> Alexandre > >> > >> Le mer. 29 oct. 2025 à 11:04, Richard Zowalla <[email protected]> a > écrit : > >> > > >> > - Build from source archive w/ tests > >> > - Checked signatures and hashes via > >> > https://gist.github.com/rzo1/61875defee959c048754fc19e17b7c66 > >> > - Skimmed through the maven repositories > >> > - Run a small topology > >> > > >> > -> +1 (binding) > >> > > >> > Am Sonntag, dem 26.10.2025 um 01:36 +0000 schrieb Rui Abreu: > >> > > Hi folks, > >> > > > >> > > I have posted a 1st release candidate for the Apache Storm 2.8.3 > >> > > release and it is ready for testing. > >> > > > >> > > The Nexus staging repository is here: > >> > > > >> > > > https://repository.apache.org/content/repositories/orgapachestorm-1120 > >> > > > >> > > Storm Source and Binary Release with sha512 signature files are > here: > >> > > > >> > > > https://dist.apache.org/repos/dist/dev/storm/apache-storm-2.8.3-rc1/ > >> > > The release artifacts are signed with the following key: > >> > > > >> > > > https://keyserver.ubuntu.com/pks/lookup?op=index&fingerprint=on&search=rabreu > >> > > in this file https://www.apache.org/dist/storm/KEYS > >> > > > >> > > The release was made from the Apache Storm 2.8.3 tag at: > >> > > https://github.com/apache/storm/tree/v2.8.3 > >> > > > >> > > Full list of changes in this release: > >> > > > >> > > > https://dist.apache.org/repos/dist/dev/storm/apache-storm-2.8.3-rc1/RELEASE_NOTES.html > >> > > > >> > > To use it in a maven build set the version for Storm to 2.8.3 and > add > >> > > the following URL to your settings.xml file: > >> > > > https://repository.apache.org/content/repositories/orgapachestorm-1120 > >> > > > >> > > The release was made using the Storm release process, documented on > >> > > the GitHub repository: > >> > > https://github.com/apache/storm/blob/master/RELEASING.md > >> > > > >> > > Please vote on releasing these packages as Apache Storm 2.8.3. The > >> > > vote is open for at least the next 72 hours. > >> > > "How to vote" is described here: > >> > > > https://github.com/apache/storm/blob/master/RELEASING.md#how-to-vote-on-a-release-candidate > >> > > When voting, please list the actions taken to verify the release. > >> > > > >> > > Only votes from the Storm PMC are binding, but everyone is welcome > to > >> > > check the release candidate and vote. > >> > > The vote passes if at least three binding +1 votes are cast. > >> > > > >> > > [ ] +1 Release this package as Apache Storm 2.8.3 > >> > > [ ] 0 No opinion > >> > > [ ] -1 Do not release this package because... > >> > > > >> > > Thanks to everyone who contributed to this release. > >> > >
