ERROR SolrDispatchFilter Could not start Solr. Check solr/home property and the logs ERROR SolrCore null:java.lang.NoClassDefFoundError: org/apache/logging/log4j/core/Appender <stack trace> Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.core.Appender
Environment
EDR Server: 7.6.x
Cause
The /usr/share/cb/solr/server/lib/ext/log4j.core-2.17.1.jar file missing.
Resolution
Upgrade to EDR 7.7.x or greater.
Check the files in /usr/share/cb/solr/server/lib/ext/ and confirm log4j-core-2.17.1.jar (or later) is there and has matching permissions. If it is missing upgrade EDR or move the file from a working EDR server.