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https://issues.apache.org/jira/browse/SOLR-5708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894806#comment-13894806
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Leonid Boytsov commented on SOLR-5708:
--------------------------------------

It is a documented option and there is a code to process it (I was debugging 
Solr):
http://wiki.apache.org/solr/SolrConfigXml#lib

> the tag lib doesn't work in solrconfig.xml
> ------------------------------------------
>
>                 Key: SOLR-5708
>                 URL: https://issues.apache.org/jira/browse/SOLR-5708
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.6, 4.6.1
>         Environment: Linux, Ubuntu, but I believe this is not related.
>            Reporter: Leonid Boytsov
>            Priority: Minor
>
> The lib option doesn't work and, hence, you cannot add put a solr extension 
> jar in a specified library. As a workaround you can put the jar into 
> <instance dir>/lib
> It doesn't work for at least two reasons:
> 1) The instance dir is added twice: once in initLibs, and another time in 
> addToClassLoader
> 2) When I fixed this, I found out that the filtering class for 
> addToClassLoader doesn't work properly.
> A rough fix is as follows, but it, probably, can't make use of Solr variables 
> such as solr.solr.home. This is code changed in initLibs, I commented out 
> incorrect lines:
> {code}
>         } else if (null != path) {
>           //final File file = FileUtils.resolvePath(new 
> File(loader.getInstanceDir()), path);
>           final File file = new File(path);
>           loader.addToClassLoader(file.getParent(), new FileFilter() {
>             @Override
>             public boolean accept(File pathname) {
>               //return pathname.equals(file);
>               return true;
>             }
>           }, false);
> {code}



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