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https://issues.apache.org/jira/browse/SOLR-15017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240481#comment-17240481
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David Smiley commented on SOLR-15017:
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Hi; thanks for reporting this regression. I think it was my fault. The fix
seems straight-forward to me... basically don't exit early from this method
just because there is no {{<lib>}} in the XML. WDYT? Can you file a PR?
> The core's lib/ folder content is not loaded in the classloader anymore when
> the core's configuration does not define any <lib> element
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-15017
> URL: https://issues.apache.org/jira/browse/SOLR-15017
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.7
> Reporter: Thomas Mortagne
> Priority: Blocker
> Labels: regression
>
> I just upgraded solr-core (I'm using Solr in embedded mode) from 8.5.1 to
> 8.7.0 and it seems that the lib subfolder inside a core folder is not taken
> into account anymore.
> Works fine when I move the lib/ folder one level up (in the Solr home folder)
> but when the lib folder with the plugins is located in the core folder it
> cannot find any of the classes.
> I debugged it a little and I think the regression was caused by the
> refactoring done in
> https://github.com/apache/lucene-solr/commit/732348ec7f9c6b6f7bf9d539a40e50d16198cccc#diff-473fbcdab103c08461ad1b3c3bb1c6d56f1bcd16d6ce341d80855db2cb20a427R749
> : the handling of the lib/ core's sub folder was moved to
> SolrConfig#initLibs() but unfortunately the check to make sure there is at
> least one {{<lib>}} element in the configuration file was not removed which
> means that if you don't have any of those then the content of the lib/ folder
> is totally ignored.
> That debugging was easy enough but I don't know Solr internals enough to
> propose something clean to fix the issue in a pull request.
> The workaround is to make sure there is at least one {{<lib/>}} element (for
> example {{{{<lib dir="lib" regex=".*\.jar" />}}}}) in the core's
> solrconfig.xml file.
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