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https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384967#comment-16384967
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Erick Erickson commented on SOLR-7887:
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I somehow didn't include disruptor-NOTICE.txt in my patch, included now.
If you have precommit failures and the like, here's a problem I had:
log4j-1.2.17.jar (and a couple of others) are no longer necessary. However, if
you've built Solr sometime, even if you switch branches, you'll have some
leftover symlinks in the following 4 directories that log4j-1.2.17.jar (and
others) points to in your ivy cache.... which may not exist. Precommit will
fail if they're not presetn.
NOTE: I was being thorough and deleting my ivy cache to be sure we'd get
everything properly, if I hadn't I wouldn't have this problem.
solr/core/lib/
solr/solr-ref-guide/lib/
solr/server/lib/ext/
solr/solrj/test-lib/
So I just removed everything in the 4 directories above and I'm back being able
to run precommit.
NOTE: _compiling_ worked even with the symlinks pointing nowhere.
> Upgrade Solr to use log4j2 -- log4j 1 now officially end of life
> ----------------------------------------------------------------
>
> Key: SOLR-7887
> URL: https://issues.apache.org/jira/browse/SOLR-7887
> Project: Solr
> Issue Type: Task
> Affects Versions: 5.2.1
> Reporter: Shawn Heisey
> Assignee: Varun Thacker
> Priority: Major
> Attachments: SOLR-7887-WIP.patch, SOLR-7887-eoe-review.patch,
> SOLR-7887-eoe-review.patch, SOLR-7887.patch, SOLR-7887.patch,
> SOLR-7887.patch, SOLR-7887.patch, SOLR-7887.patch, SOLR-7887.patch,
> SOLR-7887.patch, SOLR-7887.patch, SOLR-7887.patch
>
>
> The logging services project has officially announced the EOL of log4j 1:
> https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces
> In the official binary jetty deployment, we use use log4j 1.2 as our final
> logging destination, so the admin UI has a log watcher that actually uses
> log4j and java.util.logging classes. That will need to be extended to add
> log4j2. I think that might be the largest pain point to this upgrade.
> There is some crossover between log4j2 and slf4j. Figuring out exactly which
> jars need to be in the lib/ext directory will take some research.
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