CI infra: Maven cannot resolve parent POM org.apache:apache (${repoOrgUrl}) #20436

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Status: Open: recurred after #20459
Subject: Maven project-model build aborts before any test runs (any Maven job)
Failures: 3 · First seen: 2026-09-23 · Last seen: 2026-10-08

Root cause

Maven aborts building the project model because it cannot fetch the parent POM org.apache:apache:pom:NN from Maven Central. Earlier failures fell back to a repository declared with unresolved ${repoOrgUrl} placeholders; on 2026-10-08 Central itself answered not-found for org.apache:apache:pom:40 on a runner with no ~/.m2 cache, three times in about 25 s, while every other job in the same run resolved it. It is a transient Central/CDN miss, unrelated to the commits.

Suggested fix

#20459 added a 3-attempt ./mvnw -N validate pre-resolve step, which is not enough. Use a longer exponential backoff (e.g. 5 attempts up to ~2 minutes) in that step, and always restore a small ~/.m2 cache that holds org.apache:apache so the job doesn't depend on a fresh Central download.

Occurrences

Failed push-triggered master jobs only. The daily triage routine adds one row per new failed job.