Latest version of log4j:apache-log4j-extras
https://javadoc.io/doc/log4j/apache-log4j-extras
Current version 1.2.17
https://javadoc.io/doc/log4j/apache-log4j-extras/1.2.17
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/log4j/apache-log4j-extras/1.2.17/package-list