[LogBack] 0. Define

Define

- Logback is intended as a successor to the popular log4j project

Logback's architecture is sufficiently generic so as to apply under different circumstances. At present time, logback is divided into three modules,

1. logback-core

- The logback-core module lays the groundwork for the other two modules

2. logback-classic

- The logback-class module can be assimilated to a significantly improved version of log4j

- The logback-class natively implements the SLF4J API so that you can readily switch back and forth between logback and other logging framework such as log4j of java.util.logging

3. logback-access

- The logback-access module integrates with Servlet containers, such as Tomcat and Jetty to provide HTTP-access log functionality