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https://issues.apache.org/jira/browse/SOLR-12005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369690#comment-16369690
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Erick Erickson commented on SOLR-12005:
---------------------------------------

Dunno, If you specify the -v option when starting Solr, does that provide the 
information you want? If so, for those few times you really want to see each 
and every jar this seems simpler.

> Solr should have the option of logging all jars loaded
> ------------------------------------------------------
>
>                 Key: SOLR-12005
>                 URL: https://issues.apache.org/jira/browse/SOLR-12005
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Shawn Heisey
>            Priority: Major
>
> Solr used to explicitly log the filename of every jar it loaded.  It seems 
> that the effort to reduce the verbosity of the logs has changed this, now it 
> just logs the *count* of jars loaded and the paths where they were loaded 
> from.  Here's a log line where Solr is reading from ${solr.solr.home}/lib:
> {code}
> 2018-02-01 17:43:20.043 INFO  (main) [   ] o.a.s.c.SolrResourceLoader [null] 
> Added 8 libs to classloader, from paths: [/index/solr6/data/lib]
> {code}
> When trying to help somebody with classloader issues, it's more difficult to 
> help when the list of jars loaded isn't in the log.
> I would like the more verbose logging to be enabled by default, but I 
> understand that many people would not want that, so I propose this:
>  * Enable verbose logging for ${solr.solr.home}/lib by default.
>  * Disable verbose logging for each core by default.  Allow solrconfig.xml to 
> enable it.
>  * Optionally allow solr.xml to configure verbose logging at the global level.
>  ** This setting would affect both global and per-core jar loading. Each 
> solrconfig.xml could override.
> Rationale: The contents of ${solr.solr.home}/lib are loaded precisely once, 
> and this location doesn't even exist unless a user creates it.  An 
> out-of-the-box config would not have verbose logs from jar loading.
> The solr home lib location is my preferred way of loading custom jars, 
> because they get loaded only once, no matter how many cores you have.  Jars 
> added to this location would add lines to the log, but it would not be logged 
> for every core.



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