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https://issues.apache.org/jira/browse/MDEP-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522276#comment-14522276
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Karl Heinz Marbaise commented on MDEP-442:
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May be i miss a thing here but Maven was not designed to support parallel
access to the same local repository. This could be happen if you use a ci
solution like jenkins and using the local repository of the Jenkins user with
multiple parallel Jenkins jobs. If you need this you should
http://takari.io/book/30-team-maven.html#concurrent-safe-local-repository
> Failed to access file due to locked access when using more than one Maven
> worker thread
> ---------------------------------------------------------------------------------------
>
> Key: MDEP-442
> URL: https://issues.apache.org/jira/browse/MDEP-442
> Project: Maven Dependency Plugin
> Issue Type: Bug
> Components: copy
> Affects Versions: 2.8
> Environment: MVN 3.0.4, JDK 1.7, Win 7 Pro SP1 64 Bit
> Reporter: Markus Karg
> Priority: Critical
> Fix For: waiting-for-feedback
>
> Attachments: maven-thread-test-update.zip, maven-thread-test.zip
>
>
> My multi-module POM contains of ten modules. Each of that modules does the
> same: Invoke the 'copy' goal of the dependency plugin. The idea is to have
> ten copies of the identical source, which then will end up in ten different
> targets by getting furthere processed.
> As long as I do not use more than one Maven worker thread, everything works
> well always. But when using -T 5 to have five worker threads, rather often
> the reactor fails because the source file (!) is locked:
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-dependency-plugin:2.8:copy (copy) on project
> MYARTIFACT: Unable to resolve artifact. Could not transfer artifact
> mygroup:myartifact:dll:4.36.1-20140415.143537-37 from/to nexus
> (http://nexus/nexus/content/groups/public):
> C:\Users\jenkins.QUIPSY\.m2\repository\mygroup\myartifact\4.36.1-SNAPSHOT\myartifact-4.36.1-20140415.143537-37.dll
> (The process cannot access the file, because it is in use by another process)
> {noformat}
> So it seems that the 'copy' task actually is locking the source file, which
> is not multi-threading-compatible. Hence, either that is a bug and should get
> fixed, or it is on purpose, then this goal has to be marked as
> non-multithreading-able.
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