gnodet opened a new pull request, #12926: URL: https://github.com/apache/maven/pull/12926
## Summary Backport of #12832 to `maven-4.0.x`. - Switch `ProjectIndex` backing maps from `HashMap` to `ConcurrentHashMap` to fix root cause of index corruption under parallel builds (`-T`) - Add `forkedProject` null guard (the `indices` null guard was already backported via #12911) - Enrich error messages with diagnostic hints about parallel builds and extensions ## Test plan - [x] Existing `MojoExecutorForkedExecutionTest` covers the null-guard behavior - [ ] CI green 🤖 Generated with [Claude Code](https://claude.com/claude-code) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
