Logback is an increasingly popular logging framework intended as a successor to the popular log4j project. It is designed by the founder of log4j. Logback offers many advantages over log4j like faster, smaller memory footprint, automatic reloading of configuration files, automatic compression of archived log files, conditional processing of configuration files and many more. For more details go through the following link Reasons to prefer logback over log4j.
This tutorial describes how to configure SLF4J and Logback as logging solution of an application.