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https://issues.apache.org/jira/browse/SOLR-12236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16443114#comment-16443114
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Shawn Heisey commented on SOLR-12236:
-------------------------------------
Attached a patch against master that appears to fix the problem.
We were using a deprecated method in the log4j2 "LogEvent" class. Switching to
the recommended replacement appears to be all that was needed to fix it. This
might be a bug in LogEvent. I am verifying this.
> Admin UI logging page: "Core" column never gets populated
> ---------------------------------------------------------
>
> Key: SOLR-12236
> URL: https://issues.apache.org/jira/browse/SOLR-12236
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI, logging
> Affects Versions: 6.6.3, 7.3
> Reporter: Shawn Heisey
> Priority: Major
> Attachments: SOLR-12236.patch
>
>
> The logging page in the admin UI has a "Core" column, but there is never
> anything in that column. I fired up the techproducts example, then used the
> Documents tab to try to index a document missing the "id" field, and got this
> error in the logfile:
> ERROR - 2018-04-18 18:51:31.232; [ x:techproducts]
> org.apache.solr.common.SolrException; org.apache.solr.common.SolrException:
> Document is missing mandatory uniqueKey field: id
> The core name (techproducts) is in the logfile as seen above, but when
> looking at the logging page in the UI, it can't be found anywhere.
> This is the case in both master and branch_7x. I also tried it on the 6.6.3
> version (binary package) with the same results. On version 5.3.2-SNAPSHOT,
> the Core column says "null" for all logs, instead of being blank. That
> column does not appear to be present in 4.x versions.
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