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Upgrade to patched Corretto 21 and increase Metaspace limit - #561
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SoLetsDev
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Oct 22, 2026
cditcher
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Upgrade the build and runtime to timezone-patched Amazon Corretto 21.0.12 Alpine, with the Spring Boot and build-tool compatibility updates for Java 21, Sonar Maven scanner 5.8.0.7211, and CI path filters covering the Dockerfile and workflows.
Also increase MaxMetaspaceSize from 100 MB to 300 MB. Course API exhausted the previous cap on its first request after the upgrade; increasing it to 300 MB resolved that failure during rollout.
Validation: the Java 21 migration passed the service test suite, Docker build, non-root execution, and BC/Alberta timezone checks. For the Metaspace follow-up, verified that only the cap changed and git diff --check passed; full endpoint checks were not repeated. Check representative endpoints after deployment and monitor memory usage.