Reduce CI build matrix on macOS and Windows to min/max JDK#1064
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vharseko merged 1 commit intoJul 10, 2026
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Keep the full Java matrix (11, 17, 21, 25, 26) on ubuntu-latest, which also runs the integration tests and Docker jobs, but only exercise the minimum and maximum supported JDKs (11 and 26) on macos-latest and windows-latest via matrix include. This cuts the matrix from 15 jobs down to 9 while retaining OS smoke coverage on the JDK edges.
This was referenced Jul 9, 2026
maximthomas
approved these changes
Jul 9, 2026
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Summary
The
build-mavenjob matrix was a full cross-product of 5 JDKs × 3 OSes = 15 jobs. This reduces it to 9 jobs by only exercising the minimum and maximum supported JDKs (11 and 26) on macOS and Windows.11, 17, 21, 25, 26(also runs the integration-test profile and feeds the Docker jobs)11and26only (viainclude)11and26only (viainclude)Because the
includeentries useosvalues that don't match the baseos: [ ubuntu-latest ], GitHub Actions creates them as new combinations rather than expanding existing ones, so JDK 17/21/25 no longer run on macOS/Windows.Rationale
macOS and Windows runners are the slowest and scarcest in CI; the intermediate JDKs on those platforms rarely surface OS-specific issues that the JDK edges don't. Full coverage is retained on Linux.