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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