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https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16414327#comment-16414327
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Varun Thacker commented on SOLR-7887:
-------------------------------------
{quote}You mean you can't find it in that file, or can't find where it's
defined? If the former, see line #87 of configuring-logging.adoc. If the
latter, see solr-ref-guide/src/_config.yml.template and
solr-ref-guide/build.xml (or maybe just look at SOLR-12118).
{quote}
Thanks Cassandra for pointing it out. Looks like this commit will break the
intention of how SOLR-12118 was supposed to work.
Quick analysis:
As of current master ivy-versions.properties has this
{code:java}
org.log4j.major.version = 2.11
org.log4j.minor.version = 0
org.apache.logging.log4j.version =
${org.log4j.major.version}.${org.log4j.minor.version}{code}
_config.yml.template has this
{code:java}
ivy-log4j-version: "${ivyversions.org.log4j.major.version}"{code}
And here is the excerpt from configuring-logging.adoc
{code:java}
Solr uses http://logging.apache.org/log4j/{ivy-log4j-version}/[Log4J version
{ivy-log4j-version}] for logging which is configured using
`server/resources/log4j2.xml`.{code}
The website [https://logging.apache.org/log4j/2.x/] has 2.x and not 2.11 .
Earlier it used to be [https://logging.apache.org/log4j/1.2/] so this would
have worked before the upgrade of Log4J
cc [~hossman] [~erickerickson]
> 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
> Reporter: Shawn Heisey
> Assignee: Erick Erickson
> Priority: Major
> Fix For: 7.4
>
> Attachments: SOLR-7887-WIP.patch, SOLR-7887-eoe-review.patch,
> SOLR-7887-eoe-review.patch, SOLR-7887-followup_1.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,
> 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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