[jira] [Commented] (MNG-7425) Maven artifact downloads sometimes result in empty zip files in local repository

["Michael Osipov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MNG-7425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17498812#comment-17498812 ] 

Michael Osipov commented on MNG-7425:
-------------------------------------

This will go away with Maven 3.9.0. Search for my participation in concurrency issues.

> Maven artifact downloads sometimes result in empty zip files in local repository
> --------------------------------------------------------------------------------
>
>                 Key: MNG-7425
>                 URL: https://issues.apache.org/jira/browse/MNG-7425
>             Project: Maven
>          Issue Type: Bug
>          Components: Artifacts and Repositories
>    Affects Versions: 3.8.4
>            Reporter: Nils Breunese
>            Priority: Major
>
> I’ve been encountering Maven warnings like these for years from time to time:
> {code}
> WARN: zip file is empty: /Users/username/.m2/repository/com/example/example-artifact/1.2.3/example-artifact-1.2.3.jar
> java.util.zip.ZipException: zip file is empty
> {code}
> This issue causes builds to fail. While I am sure that Maven 3.8.4 is affected, this is certainly not the oldest version that is affected.
> According to [the thread I started about this on the Maven users mailinglist this issue|https://lists.apache.org/thread/5kq5xkwdm2583dhfor78vf0l5mc11l9x] occurs on at least macOS, Linux and Windows.
> I know that when I encounter this I can just delete the file and run Maven again and then it’ll generally download ok, but this a manual workaround for an issue that shouldn't exist in the first place.
> * Could Maven be modified to ensure that 0 bytes artifacts don't end up in the local repository?
> * Would it make sense for Maven to assume that an empty JAR file was not downloaded correctly and the download should be retried automatically?



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