API for SLF4J (The Simple Logging Facade for Java) which serves as a simple facade or abstraction for various logging frameworks, allowing the end user to plug in the desired logging framework at deployment time.

Binding/provider for SLF4J, which outputs all events to System.err. Only messages of level INFO and higher are printed.

Binding/provider for NOP, an implementation that silently discards all logging messages.

Extensions to the SLF4J API

nlog4j - NLOG4J is a production-quality log4j-replacement with native SLF4J API support. See http://www.slf4j.org/nlog4j/