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[Backport 4.0.x] Fix #12530: add mvnup upgrade strategies for Maven 4 known compatibility issues - #12560
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…ity issues Add 4 new mvnup strategies addressing Maven 4 compatibility issues from the maven4-testing project: update compiler-plugin min to 3.11.0 for ErrorProne, detect and upgrade old 4.x alpha/beta/RC plugin versions, migrate deprecated org.scala-tools:maven-scala-plugin to net.alchim31.maven:scala-maven-plugin, and add DuplicateElementStrategy to remove duplicate POM elements rejected by Maven 4's stricter parser. Refactors PluginUpgradeStrategy to derive its map from the PLUGIN_UPGRADES list instead of maintaining a separate hand-coded map. Closes #12532
gnodet
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✅ Clean cherry-pick of the already-reviewed-and-merged PR #12532 to the 4.0.x branch. The diff is byte-identical to the original, all previous review feedback was addressed, and test coverage is solid (31 new tests across DuplicateElementStrategyTest and PluginUpgradeStrategyTest).
The four new strategies (ErrorProne-compatible compiler-plugin minimum, Maven 4 pre-release version upgrade, scala-plugin migration, and duplicate element removal) are all relevant to 4.0.x since they address Maven 4 compatibility issues.
Minor note (non-blocking): getPluginUpgradesMap() rebuilds a HashMap on every call while the analogous PLUGIN_MIGRATIONS_MAP was correctly hoisted to static final — could be made consistent in a follow-up.
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Claude Code on behalf of gnodet
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Summary
Backport of #12532 to
maven-4.0.x.Cherry-pick of 82f438a — clean, no conflicts.
Add 4 new mvnup strategies addressing Maven 4 compatibility issues from
the maven4-testing project: update compiler-plugin min to 3.11.0 for
ErrorProne, detect and upgrade old 4.x alpha/beta/RC plugin versions,
migrate deprecated org.scala-tools:maven-scala-plugin to
net.alchim31.maven:scala-maven-plugin, and add DuplicateElementStrategy
to remove duplicate POM elements rejected by Maven 4's stricter parser.
Original PR: #12532
Closes #12530