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https://issues.apache.org/jira/browse/MASSEMBLY-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16923089#comment-16923089
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Tuomas Kiviaho commented on MASSEMBLY-870:
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I tried to upgrade from 2.6 to 3.1.1 and the problem still remains. Local
repository is still not utilized and the build takes way too long.
> Regression: Repository downloads all dependencies remotely into _tmp folders
> ----------------------------------------------------------------------------
>
> Key: MASSEMBLY-870
> URL: https://issues.apache.org/jira/browse/MASSEMBLY-870
> Project: Maven Assembly Plugin
> Issue Type: Bug
> Affects Versions: 3.1.0
> Reporter: Tuomas Kiviaho
> Priority: Major
>
> Repository {{_tmp}} folders under {{achive-tmp}} are filled with dependency
> artifacts (.jar files and all) from pom which are not met by the filtering. I
> noticed this when shifting from 2.6 to 3.1.0 and it is quite critical because
> these dependencies do not come from local repo, but instead they are always
> downloaded remotely.
> I do have {{dependency:copy}} also before this plugin which doesn't do this
> so I bet it has something to do with how the Aether is setup in
> {{DefaultRepositoryAssembler}}. By removing the {{<repositories>}} section
> the assembly stopped this.
> The end result is now that everything that I've got in my pom is being filled
> into {{runner/tmp/repo_tmp}}.
> {code}
> <repository>
> <scope>provided</scope>
> <includeMetadata>false</includeMetadata>
> <includes>
>
> <include>org.mortbay.jetty.alpn:alpn-boot</include>
> </includes>
> <outputDirectory>runner/tmp/repo</outputDirectory>
> </repository>
> </repositories>
> {code}
> Once the assembly is complete the _tmp folder gets deleted and the end result
> contains just that one jar file.
> This is kind of a blocker, because I bet people have got used over the years
> to cleaning the target folder so that they can get a nice assembly each time
> a dependency is being upgraded despite the efforts of incremental builds. Due
> to the cleaning there will always be repeated remote downloads because local
> repository in settings is not utilized.
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