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https://issues.apache.org/jira/browse/SOLR-12005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17078704#comment-17078704
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David Smiley commented on SOLR-12005:
-------------------------------------
Instead of looking for logging as the tool for this need, we might instead look
for Solr administrative handlers to expose this information.
> 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
> Components: logging
> 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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