The Apache Solr web application uses Apache Log4J as log framework, which is configured in the file
log4j.properties.
Note that you can use the Solr admin page to view log messages and change the log level at runtime. Alternatively you could configure Apache Solr to use Logback as well, but then you cannot use the logging functionality of the Solr admin page. See https://cwiki.apache.org/confluence/display/solr/Configuring+Logging for details on Solr log configuration.
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