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https://issues.apache.org/jira/browse/SOLR-14484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111446#comment-17111446
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David Smiley commented on SOLR-14484:
-------------------------------------
I propose simply using {{String.valueOf(client.getBaseURL())}} instead, and
thus wind up with a simple "null" string in this case. WDYT?
> 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
>
>
> {{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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