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https://issues.apache.org/jira/browse/LUCENE-4115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292016#comment-13292016
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Dawid Weiss commented on LUCENE-4115:
-------------------------------------

Hoss -- I've been doing some experiments with ivy (and I know very little about 
it) but it seems that you can use ivy to build both <path> elements and 
<fileset> elements from the same configuration. This means you would construct 
an identical path for any java invocation/ taskdef, etc. and a fileset for 
<copy> to lib/.

I agree with you 100% that we shouldn't be doing any copying or filtering 
manually -- it has to be the same fileset.

http://ant.apache.org/ivy/history/trunk/use/cachepath.html
http://ant.apache.org/ivy/history/trunk/use/cachefileset.html

We could even use the fileset only and just put it under a custom <path 
id="..."> element. 

Note that at the moment this isn't consistent either -- if there is a jar 
dependency upgrade people are left with unused jars under lib/* and this can 
(and does) cause headaches until you realize you need to clean up that folder 
(which is a reason for this issue, actually).
                
> JAR resolution/ cleanup should be done automatically for ant clean/ eclipse/ 
> resolve.
> -------------------------------------------------------------------------------------
>
>                 Key: LUCENE-4115
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4115
>             Project: Lucene - Java
>          Issue Type: Task
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Trivial
>             Fix For: 4.0, 5.0
>
>         Attachments: LUCENE-4111.patch, LUCENE-4115.patch
>
>
> I think we should add the following target deps:
> ant clean [depends on] clean-jars
> ant resolve [depends on] clean-jars
> ant eclipse [depends on] resolve, clean-jars
> ant idea [depends on] resolve, clean-jars
> This eliminates the need to remember about cleaning up stale jars which users 
> complain about (and I think they're right about it). The overhead will be 
> minimal since resolve is only going to copy jars from cache. Eclipse won't 
> have a problem with updated JARs if they end up at the same location.
> If there are no objections I will fix this in a few hours.

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