[MNG-7868] "Could not acquire lock(s)" error in concurrent maven builds

**[Jörg Hohwiller](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=hohwille)** opened **[MNG-7868](https://issues.apache.org/jira/browse/MNG-7868?redirect=false)** and commented

```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-install-plugin:3.1.1:install (default-install) on project foo.bar: Execution default-install of goal org.apache.maven.plugins:maven-install-plugin:3.1.1:install failed: Could not acquire lock(s) -> [Help 1]
```

I am using maven 3.9.4 on windows:

```
$ mvn -v
Apache Maven 3.9.4 (dfbb324ad4a7c8fb0bf182e6d91b0ae20e3d2dd9)
Maven home: D:\projects\test\software\mvn
Java version: 17.0.5, vendor: Eclipse Adoptium, runtime: D:\projects\test\software\java
Default locale: en_US, platform encoding: UTF-8
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"
```

I searched for this bug and found issues like MRESOLVER-332 that first look identical or similar but do not really seem to be related so I decided to create this issue.

For this bug I made the following observations:
* it only happens with concurrent builds: `mvn -T ...`
* is seems to be windows related (at least mainly happens on windows)
* it is in-deterministic and is not so easy to create an isolated and simple project and a reproducible scenario that always results in this error. However, I get this very often in my current project with many modules (500+).
* it is not specific to the maven-install-plugin and also happens from other spots in maven:

I also got this stacktrace:

```
Suppressed: java.lang.IllegalStateException: Attempt 1: Could not acquire write lock for 'C:\Users\hohwille\.m2\repository\.locks\artifact~com.caucho~com.springsource.com.caucho~3.2.1.lock' in 30 SECONDS
at org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter$AdaptedLockSyncContext.acquire (NamedLockFactoryAdapter.java:202)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (DefaultArtifactResolver.java:271)
at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts (DefaultArtifactResolver.java:259)
at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies (DefaultRepositorySystem.java:352)
```

See also this related discussion:
https://github.com/apache/maven-mvnd/issues/836#issuecomment-1702488377

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**Attachments:**
- [image-2024-04-10-15-44-37-013.png](https://issues.apache.org/jira/secure/attachment/13068082/image-2024-04-10-15-44-37-013.png) (_1.05 MB_)
- [MNG-7868.zip](https://issues.apache.org/jira/secure/attachment/13070544/MNG-7868.zip) (_2.99 kB_)
- [MNG-7868-pz_ai_37_lock.txt](https://issues.apache.org/jira/secure/attachment/13070319/MNG-7868-pz_ai_37_lock.txt) (_41.57 kB_)
- [MNG-7868-reproduce.txt](https://issues.apache.org/jira/secure/attachment/13070545/MNG-7868-reproduce.txt) (_46.80 kB_)
- [screenshot-1.png](https://issues.apache.org/jira/secure/attachment/13066757/screenshot-1.png) (_92.12 kB_)

**Issue Links:**
- [MNG-7705](https://issues.apache.org/jira/browse/MNG-7705) Sporadic failures on multiple builds sharing the same local repo when writing the .lastUpdated file

9 votes, 21 watchers