Apache Log4j2 is a logging library and logging API facade for Java with API adapters for Scala and Kotlin. Log4j is widely used throughout the world, though the core maintainers consist of a few active volunteers, none of which are sponsored by any companies to do so.

Log4j was subject to a devastating security vulnerability in the end of 2021. This security vulnerability may have been discovered much sooner given sufficient sponsorship to perform deeper security audits of the codebase. Sponsorship would help to invest more time in security review and other maintenance tasks to keep Log4j supporting future versions of Java.