[jira] (MDEP-442) Failed to access file due to locked access when using more than one Maven worker thread

["Markus KARG (JIRA)" <ji...@codehaus.org>]

Markus KARG created MDEP-442:
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             Summary: Failed to access file due to locked access when using more than one Maven worker thread
                 Key: MDEP-442
                 URL: https://jira.codehaus.org/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


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:

[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)

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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