[evanchooly]

Unblocks CI. Every PR's Build job, #4403 included, is failing in MongoExtension.beforeAll with Container startup failed for image mongo:8 … Container exited with code 1.

Cause

• mongo:8 moved to MongoDB 8.3.13 on 2026-10-17. That release refuses to start on Linux 6.19 and newer: "MongoDB cannot start: Linux kernel versions 6.19 and newer has a known incompatibility with this version of MongoDB" (SERVER-121912).
• The current 8.0 release, 8.0.34, has the same check. 7.0.45, 8.2.12 and 9.0.4 start fine. I checked each image locally on a 7.0 kernel.
• The version flag was being ignored. MongoExtension and TestBase.withSharding built the image tag from the major version only. So the matrix's 8.3.13, 8.2.12 and 8.0.34 entries, and the 8.0.0 local default, all ran mongo:8. The 8.x entries weren't testing the versions they're named for.

Changes

• Exact image tags. MongoExtension.imageName(version) uses -Dmongodb as given: mongo:8.2.12 for a full version, or mongo:8.2 for that line's latest release. withSharding uses the same helper.
• New default. The default changes from 8.0.0 (which ran mongo:8) to 8.2.
• Matrix filter. BuildMatrix skips exactly 8.0.34 and 8.3.13, with a comment pointing at SERVER-121912, so the matrix is now ['9.0.4', '8.2.12', '7.0.45']. A later 8.0 or 8.3 patch release is picked up automatically. If one of those is still broken, CI fails until it's added to the list.

Verified

• The core and Kotlin suites pass with the new default (mongo:8.2) under -Dmorphia.mapper=critter and reflection: 1485 + 5 tests, 0 failures.
• TestSharding's sharded cluster starts on mongo:8.2.
• -Dmongodb=7.0.45 runs exactly mongo:7.0.45, and TestQuery passes on it.

Decisions to review

1. The skip lists exact versions (8.0.34, 8.3.13), not whole release lines. This was changed in review. Fixed patch releases come back into the matrix on their own, at the cost of a failing build if a new patch release is still affected.

[Copilot]

🟢 Approval recommended

The focused changes consistently implement the intended version selection and exclusions, with no blocking issues identified.

No open issues 🎉

What changed in this PR

Corrects MongoDB version selection in Morphia’s test infrastructure and avoids release lines affected by newer-kernel startup failures.

Changes:

• Preserves requested MongoDB image tags for standard and sharded tests.
• Changes the default MongoDB version to 8.2.
• Temporarily excludes MongoDB 8.0 and 8.3 from the CI matrix.

File	Description
core/​src/​test/​java/​dev/​morphia/​test/​TestBase.java	Uses shared version and image helpers for sharded tests.
core/​src/​test/​java/​dev/​morphia/​test/​MongoExtension.java	Centralizes image selection and sets the new default.
.github/​BuildMatrix.java	Filters affected release lines and documents removal conditions.

_{Review effort: Balanced}