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https://issues.apache.org/jira/browse/SOLR-15017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17241855#comment-17241855
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ASF subversion and git services commented on SOLR-15017:
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Commit ce1b907924a30dd3312e24cbad0b981c5be11799 in lucene-solr's branch
refs/heads/branch_8x from Thomas Mortagne
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=ce1b907 ]
SOLR-15017: Core's lib/ dir was ignored sometimes (#2107)
A core's lib/ folder was ignored when the core's configuration did not define
any <lib> element. This is a regression introduced in 8.6 by SOLR-14197.
(cherry picked from commit feb897a962453e6b92dd7bbe51eb2c434cf3143d)
> 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
> Assignee: David Smiley
> Priority: Blocker
> Labels: regression
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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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