Logging does have its drawbacks. It can slow down an application. If too verbose, it can cause scrolling blindness. To alleviate these concerns, log4j is designed to be reliable, fast and extensible. Since logging is rarely the main focus of an application, the log4j API strives to be simple to understand and to use.
Log4j is a logging framework (APIs) written in Java, which is distributed under the Apache Software License. Log4j is a popular logging package. Log4j has been ported to the C, C++, C#, Perl, Python, Ruby, and Eiffel languages.

This tutorial has been prepared for beginners to help them understand the basic functionality of log4J logging framework.