slachiewicz commented on PR #1712:
URL: https://github.com/apache/maven-mvnd/pull/1712#issuecomment-5179240901
### Investigation into CI `BootstrapPluginTest` failure
The GraalVM 25 ARM64 `stat@GLIBC_2.17` shim and test hermeticity fixes in
this PR are verified and complete.
Separately, `BootstrapPluginTest.cleanInstall` hit a race condition:
```
Caused by: java.nio.file.NoSuchFileException:
/.../target/project-local-repo/org.reproducer/bootstrap
at org.apache.maven.plugins.clean.CleanMojo.execute(CleanMojo.java:277)
```
#### Root Cause
In Maven 4, `ReactorReader` provisions a shared session-scoped repository at
`${session.rootDirectory}/target/project-local-repo`.
When `mvnd clean install` executes a multi-module project in parallel (via
`SmartBuilder` with multiple threads):
1. **Thread 1** (Root project `clean` phase): `maven-clean-plugin`
recursively deletes the root `target/` directory (which includes
`target/project-local-repo`).
2. **Thread 2** (Submodule `install`/`build` phase): Submodule `bootstrap`
finishes building and `ReactorReader` writes/installs artifacts into
`${session.rootDirectory}/target/project-local-repo/org.reproducer/bootstrap/`.
Because `project-local-repo` is located inside `target/`, Thread 1 deletes
subdirectories mid-traversal while Thread 2 is actively reading or writing into
`project-local-repo`, resulting in `java.nio.file.NoSuchFileException`.
#### Proposed Architectural Fixes
- **In test project (`src/test/projects/bootstrap-plugin/pom.xml`):**
Exclude `project-local-repo` from `maven-clean-plugin` target deletion during
parallel reactor execution.
- **In Maven 4 Core / `ReactorReader`:** Ensure session-scoped
`project-local-repo` is managed with proper lifecycle locking or excluded from
module-level `clean` tasks during parallel builds.
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