elharo opened a new issue, #12605:
URL: https://github.com/apache/maven/issues/12605
# DefaultProjectBuildingHelper: Synchronized bottleneck in parallel builds
**Found in:** maven-4.0.x branch
**File:**
`impl/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuildingHelper.java`
(line 117)
**Severity:** Medium
## Description
The entire `createProjectRealm()` method is `synchronized`, making it a
global lock during multi-module parallel builds:
```java
@Override
public synchronized ProjectRealmCache.CacheRecord createProjectRealm(
MavenProject project, Model model, ProjectBuildingRequest request)
```
During a multi-module build where many projects need extension realms set up
concurrently, each must acquire this lock serially. Since the inner
`projectRealmCache` uses `ConcurrentHashMap` and is already thread-safe, the
synchronization could be narrowed to just the non-thread-safe portions.
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