[cirquare]

Summary

• Restore opt-in com.linkedin.beam release/snapshot coordinates for 2.75.1, preserving upstream mode, dependency-management BOMs and vendor coordinates. Keep fork Java publication local-only; remote publishing and Auto ELR remain follow-up work.
• Restore a portable Java-only version updater using gradle.properties as the version source. Fix POM-only dependency configuration under configuration-on-demand and keep snapshot versions compatible with SDK resource filtering.
• Add versioning/publication regressions and run them in the existing Flink CI workflow without adding publishing permissions or release triggers.

Testing Done

• Six new build tests passed across seven publication modes and seven modules, including real SDK version resource generation and the existing Dataflow evaluation cycle; version-script syntax and buildSrc checks passed.
• Built and staged the complete 30-artifact closure as release and snapshot in separate isolated Maven repositories, 512 fresh tasks each. Verified published/embedded POM identities, jars and first-party dependency closure.
• Independent JVM consumers resolved all 20 roots from the staged POMs in both modes, with matching jar hashes and no fallback to upstream first-party Beam artifacts.
• Full LI release/publication-mode Java/Flink/Spark gates passed: 716 fresh tasks, 11,835 Java cases, 67 built-in skips, zero failures/errors. Covers all five Flink builds, Flink 1.20/2.2 conformance, the Spark 3 compatibility matrix, and Spark 4 build/conformance on JDK 17.
• Only the local runner-core test heap uses the previously approved 4 GB override. Root/cloud, live JFrog/ELR, downstream runtime/JRE compatibility and production end-to-end validation remain separate open gates.
• CI repair: the metadata checks now use explicit temporary Maven settings. All seven modes pass with a synthetic default Maven home containing an unresolved credential placeholder, leaving that default file untouched and preserving normal publication authentication. The complete metadata and Java/Flink/Spark matrix passed unchanged on rerun: six build tests, 11,835 Java cases, 67 built-in skips, zero failures/errors. An earlier full attempt encountered a closed-classloader failure in unchanged Flink 2.0 adapter code; both its complete module rerun and the subsequent entire matrix passed without runtime-code, guard or exclusion changes. This patch does not claim to fix classloader retention.