Hi Alexandre, I'd say it depends when the client will be consummed, if you do expect it to be end of the year for end users, 21 sounds good, if right now, there are still some 3rd parties you can integrate with which are relying on security manager and moving to 21 can be an issue (even spark requires some specific tuning you might have or not in existing clusters). If there is no code difference, 17 doesnt hurt, if you want to leverage the new features my 2cts would be to try to anticipate the adoption and consider > september 21 would be okish (1 year after latest LTS it is ok to support only last 2 LTS in other words).
Just my 2 cts, hope it helps a bit Romain Manni-Bucau @rmannibucau <https://x.com/rmannibucau> | .NET Blog <https://dotnetbirdie.github.io/> | Blog <https://rmannibucau.github.io/> | Old Blog <http://rmannibucau.wordpress.com> | Github <https://github.com/rmannibucau> | LinkedIn <https://www.linkedin.com/in/rmannibucau> | Book <https://www.packtpub.com/en-us/product/java-ee-8-high-performance-9781788473064> Javaccino founder (Java/.NET service - contact via linkedin) Le ven. 6 févr. 2026 à 13:54, Alexandre Dutra <[email protected]> a écrit : > Hi all, > > Yesterday during the sync meeting, we discussed the issue with the > upcoming Iceberg 1.11 release that will require Java 17 or higher. > > Polaris is currently built with Java 21 or higher [1], but the > compatibility level is set to Java 21 [2] for "server" modules, and > Java 11 for "client" modules (including polaris-core) [3]. > > We agreed yesterday that all the client modules would have to be > upgraded. The question was: should we upgrade to Java 21 directly, or > just to Java 17 initially? > > For completeness, here is the list of client modules that need an upgrade: > > api/iceberg-service > api/management-model > api/management-service > api/polaris-catalog-service > extensions/federation/hadoop > extensions/federation/hive > plugins/spark/v3.5/spark > polaris-core > tools/config-docs/annotations > tools/immutables > tools/misc-types > tools/version > > For the sake of simplicity I would be in favor of 21 directly, but > don't have strong opinions. > > I'm curious to hear your thoughts on this topic! > > Thanks, > Alex > > [1]: > https://github.com/apache/polaris/blob/26a394e0ea68c68373a75251c97ab0711e637d20/settings.gradle.kts#L24 > [2]: > https://github.com/apache/polaris/blob/9377aa731a64d6262dc7cc177d8a457d14c46f0a/build-logic/src/main/kotlin/polaris-server.gradle.kts#L24 > [3]: > https://github.com/apache/polaris/blob/9377aa731a64d6262dc7cc177d8a457d14c46f0a/build-logic/src/main/kotlin/polaris-client.gradle.kts#L24 >
