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https://issues.apache.org/jira/browse/SOLR-1449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758842#action_12758842
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Yonik Seeley commented on SOLR-1449:
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bq. repalces the ClassLoader with a new one where the parent is fixed on the 
previous classloader

I'm not a classloading expert... but couldn't this cause things to work 
differently by changing the order of the <lib> statements?


> solrconfig.xml syntax to add classpath elements from outside of instanceDir
> ---------------------------------------------------------------------------
>
>                 Key: SOLR-1449
>                 URL: https://issues.apache.org/jira/browse/SOLR-1449
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Hoss Man
>             Fix For: 1.4
>
>         Attachments: SOLR-1449.patch
>
>
> the idea has been discussed numerous times that it would be nice if there was 
> a way to configure a core to load plugins from specific jars (or "classes" 
> style directories) by path  w/o needing to copy them to the "./lib" dir in 
> the instanceDir.
> The current workaround is "symlinks" but that doesn't really help the 
> situation of the Solr Release artifacts, where we wind up making numerous 
> copies of jars to support multiple example directories (you can't have 
> reliable symlinks in zip files)

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