This module is part of the Apache Sling project.
The “log” module provides some useful extension to the default Logback feature set to enable better integration with OSGi.
The Logging bundle should be installed as one of the first modules in the OSGi framework and - provided the framework supports start levels - be set to start at start level 1. This ensures the Logging bundle is loaded as early as possible thus providing services to the framework and preparing logging.
For more details refer to the Logging Documentation
You can compile and package the jar using the following command:
mvn package