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https://issues.apache.org/jira/browse/LUCENE-5467?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-5467:
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    Attachment: LUCENE-5467.patch

Patch. The fileset was taken from the jar-checksum macro.

> Re-add "ant clean-jars" on root level
> -------------------------------------
>
>                 Key: LUCENE-5467
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5467
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: general/build
>    Affects Versions: 4.7
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 4.8, 5.0
>
>         Attachments: LUCENE-5467.patch
>
>
> Although {{ivy sync=true}} seems to work in most cases, sometimes (especially 
> when updating version numbers) the old JAR files are not nuked on resolve. I 
> have no idea about why this is still a bug in ivy, but sync=true does not 
> help in all cases.
> It would be good to re-add the {{ant clean-jars}} target to the top-level 
> build.xml, because this allows you to remove all JAR files and do a 
> re-resolve.
> The bug occurred to [[email protected]] and also to me this morning when 
> Mark updated slf4j versions: If you run {{ant jar-checksums}} after updating 
> the version numbers, it creates 2 checksum files (for the old and the new 
> version). The call to {{ant check-svn-working-copy}} then does not find a 
> violation, because the old version's checksum is still recreated. It only 
> complains about the new one, but when you add it it will not complain anymore 
> about the old one.
> The violation is only found by Jenkins, because this one does a fresh svn 
> checkout (or it emulates one), so it starts without any JARs. Because of 
> this, checksum re-creation deletes the old file (still on subversion server) 
> and a violation is detected.
> Currently I do the JAR file deletion by a find/xargs/rm and then recreate 
> checksums, which finds the problem. The good old {{ant clean-jars}} would be 
> back as a last resort if you are hit my this IVY bug when you are updating 
> revision numbers.



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