chore: bump Jenkins baseline to 2.555.3, build on JDK 21 - #172
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Jenkins 2.555.x requires Java 21+ on controller and agents (Java 17 is dropped upstream), so the CI matrix moves off 17 to 21 and 25 and the dev JDK bumps to temurin 21. Raising the required core also pulls in the 2.555.x BOM. Cut as 3.6.0 (minor) since this lifts the minimum supported Jenkins/Java rather than fixing a bug.
tembleking
requested review from
Jujuyeh,
airadier,
alecron and
mateobur
as code owners
August 7, 2026 14:21
tembleking
enabled auto-merge (squash)
August 7, 2026 14:58
alecron
approved these changes
Aug 7, 2026
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Jenkins 2.555.x requires Java 21+ on both controller and agents — Java 17 is dropped upstream — so staying on the 2.541.x baseline would keep us shipping against a core our users can no longer run on 17. This lifts the baseline to 2.555.3 (pulling in the
bom-2.555.x), moves the build/dev JDK to temurin 21, and switches the CI matrix off 17 to the two JDKs 2.555.x actually supports (21 and 25, both available on ci.jenkins.io agents).Cut as 3.6.0 (minor): it raises the minimum supported Jenkins/Java rather than changing plugin behaviour, so it's not a bugfix (patch) and doesn't break the plugin's own API (major).