What Is JCL Over Slf4j?

What Is JCL Over Slf4j? This jar file is intended as a drop-in replacement for JCL version 1.1. 1 . It implements the public API of JCL but using SLF4J underneath, hence the name “JCL over SLF4J.” … The underlying logging framework can be any of the frameworks supported by SLF4J. Often times, replacing commons-logging.