elharo opened a new issue, #12586:
URL: https://github.com/apache/maven/issues/12586
# concurrent/MojoExecutor disables all project-level locking
**Found in:** maven-4.0.x branch
**File:**
`impl/maven-core/src/main/java/org/apache/maven/lifecycle/internal/concurrent/MojoExecutor.java`
(lines 38-40)
**Severity:** Critical
## Description
The `@Named("concurrent")` MojoExecutor subclass (used for parallel builds)
disables all project-level locking:
```java
@Override
protected boolean useProjectLock(MavenSession session) {
return false; // Always returns false
}
```
The parent class's `useProjectLock()` returns `true` when
`degreeOfConcurrency > 1` (the concurrent build scenario). By always returning
`false`, this subclass allows **multiple mojos to execute concurrently on the
same project**, which can corrupt shared project state such as artifact
filters, dependency resolution state, and plugin configuration.
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