Description
Starting with Lucene 9.1.0, Lucene now logs certain warnings and errors using Java Util Logging (JUL). Upgrade notes: https://lucene.apache.org/core/9_1_0/MIGRATE.html
For Solr's Log4J setup to include these logs, we must follow Log4J's JUL instructions and set -Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager when starting Solr. We will also need to include the log4j-jul jar in lib-ext with the other logging jars.
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Issue Links
- causes
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SOLR-16976 ClassNotFoundException: org.apache.logging.log4j.jul.LogManager with JMX enabled
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