esl4j is a free and open-source Java logging facade library which acts as a logging abstraction layer for your applications.
You will be able to integrate esl4j into your apps without any code changes. Also, the fact that its core API does not depend on any other library makes it very lightweight.
Detailed instructions on how to install and use the esl4j utility on your Mac are available HERE.
esl4j is a cross-platform utility capable of running on any operating system that comes with Java support (e.g. Mac OS X, Windows, Linux).