SLF4J(Simple logging facade for JAVA) is a abstraction layer or facade for different logging frameworks like log4j,Logback etc which allows you to plugin the desired logging framework at deployment time. Also logback is a framework that implements the SLF4j api so it allows easy switching between different logging frameworks and it also provides more optimized logging than log4j by providing features such as parametrized logging. To learn more about these frameworks refer to the comprehensive documentation at the following sites:- 1. SLF4J 2....