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From "Olivier Lamy (JIRA)" <>
Subject [jira] (MDEP-368) Configure plexus-archiver to use methods to set permissions when available.
Date Tue, 21 Aug 2012 07:33:21 GMT


Olivier Lamy commented on MDEP-368:

Your patch activate this by default, this will generate a ton of warnings for 1.5 users.
I prefer we use a new configuration field as I did for assembly plugin to activate this.
I will do that.
> Configure plexus-archiver to use methods to set permissions when available.
> ----------------------------------------------------------------------------------------
>                 Key: MDEP-368
>                 URL:
>             Project: Maven 2.x Dependency Plugin
>          Issue Type: Improvement
>          Components: unpack, unpack-dependencies
>    Affects Versions: 2.5
>            Reporter: Tim Moore
>            Assignee: Olivier Lamy
>         Attachments: useJvmChmod.patch
> We updated from maven-dependency-plugin 2.4 to 2.5 in our build, and found that it slowed
down significantly. Our build process involves unpacking several large zip files, and profiling
the build showed us that the extra time was spent in Plexus Archiver's {{ArchiveEntryUtils.chmod}},
where it was executing a {{chmod}} process for each file in the archive.
> We tracked this change to an update of the Plexus Archiver dependency from 2.0 to 2.1.1
in version 2.5 of the Maven Dependency Plugin:
> Plexus Archiver can be configured to use the {{setReadable}}, {{setWritable}} and {{setExecutable}}
methods on {{}} instead of executing {{chmod}}. These methods are new in Java
6, but Plexus Archiver invokes them using reflection when they are available, falling back
on executing {{chmod}} when they are not, so it remains backwards compatible with Java 5.
> This configuration is disabled by default, but can be configured via Plexus. The attached
patch to Maven Dependency Plugin sets the archiver components to use the JVM implementation
when available.
> The patch doesn't include tests, since the behavior is dependent on the Java version
used, but when applied all of the existing tests pass in Java 6.
> Credit for the investigation and the patch is due to Vincent Choy (
He asked me to file this issue on his behalf.

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