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How do I manually update the Log4j version?

To upgrade Log4j version jar files manually from one version to another version follow the below instructions. 

  1. Download the Log4j package containing jar files from following link https://archive.apache.org/dist/logging/log4j/ and place it $APIN_HOME
  2. Unzip the downloaded package using following command
    unzip apache-log4j-2.x.x-bin.zip
  3. apache-log4j-2.x.x folder is obtained containing all the required jars that has to be replaced.
  4. Go to $APIN_HOME/sbin and stop Web, CEP, Domain and Solr services using the following command,
    ./stop.sh web 
    ./stop.sh cep
    ./stop.sh domain
    ./stop.sh solr
  5. Navigate to $APIN_HOME/solr/solr-8.11.1/server/lib/ext and replace the following jar,
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-core-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-web-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-slf4j-impl-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-layout-template-json-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-api-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-1.2-api-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/contrib/prometheus-exporter/lib/log4j-core-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/contrib/prometheus-exporter/lib/log4j-slf4j-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/contrib/prometheus-exporter/lib/log4j-api-xxx.jar
  6. If updating 11.2 (deployment pack) and later versions only the following jars shall be replaced. 
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-core-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-web-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-slf4j-impl-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-layout-template-json-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-api-xxx.jar
    $APIN_HOME/solr/solr-8.11.1/server/lib/ext/log4j-1.2-api-xxx.jar
  7. Also the commons-text-xxx.jar should be replaced in the following location 
    $APIN_HOME/solr/solr-8.11.1/server/solr-webapp/webapp/WEB-INF/lib/commons-text-xxx.jar
    This jar file can be downloaded from the following link https://archive.apache.org/dist/commons/text/binaries/
  8. Restart the Domain, CEP, web servers, and Solr services in the $APIN_HOME/sbin using ./start.sh
    ./start.sh solr
    ./start.sh domain
    ./start.sh cep
    ./start.sh web