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https://issues.apache.org/jira/browse/SOLR-14484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112220#comment-17112220
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ASF subversion and git services commented on SOLR-14484:
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Commit ec71a6b4540c0106d4bcb61e0d0d1e20c9f57973 in lucene-solr's branch
refs/heads/branch_8x from David Smiley
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=ec71a6b ]
SOLR-14484: avoid putting null into MDC
Co-authored-by: Andras Salamon
(cherry picked from commit 2ac640f9d066ebd88f4b5ebd1036792bdbf171bc)
> NPE in ConcurrentUpdateHttp2SolrClient MDC logging
> --------------------------------------------------
>
> Key: SOLR-14484
> URL: https://issues.apache.org/jira/browse/SOLR-14484
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.4.1
> Reporter: Andras Salamon
> Priority: Minor
> Attachments: SOLR-14484-01.patch, SOLR-14484-02.patch
>
>
> {{client.getBaseURL()}} can be null in {{ConcurrentUpdateHttp2SolrClient}}
> which can cause problems in MDC logging.
> We had the following error in the stacktrace. We were using Solr 8.4.1 from
> lily hbase-indexer which still uses log4j 1.2:
> {noformat}
> Error from server at http://127.0.0.1:45895/solr/collection1:
> java.lang.NullPointerException
> at java.util.Hashtable.put(Hashtable.java:459)
> at org.apache.log4j.MDC.put0(MDC.java:150)
> at org.apache.log4j.MDC.put(MDC.java:85)
> at org.slf4j.impl.Log4jMDCAdapter.put(Log4jMDCAdapter.java:67)
> at org.slf4j.MDC.put(MDC.java:147)
> at
> org.apache.solr.client.solrj.impl.ConcurrentUpdateHttp2SolrClient.addRunner(ConcurrentUpdateHttp2SolrClient.java:346)
> at
> org.apache.solr.client.solrj.impl.ConcurrentUpdateHttp2SolrClient.waitForEmptyQueue(ConcurrentUpdateHttp2SolrClient.java:565)
> {noformat}
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