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What is the difference between Simple Logging Facade for Java and Apache Commons Logging?
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Apache Commons Logging is an abstraction for the concrete implementation. It uses log4j, if present and configured.
Apache Commons Logging (previously known as Jakarta Commons Logging or JCL) is a Java-based logging utility and a programming model for logging and for other toolkits. It provides APIs, log implementations, and wrapper implementations over some other tools.
One of the most popular solutions for the Java world is the Apache Log4j 2 framework. Maintained by the Apache Foundation, Log4j 2 is an improvement on the original Log4j, which was the most popular logging framework in Java for many years.
log4j is a logging framework, i.e. it provides the code to log messages. Commons-logging is an abstraction layer for logging frameworks, it doesn't log anything itself.
From the SLF4J FAQ:
SLF4J is conceptually very similar to JCL. As such, it can be thought of as yet another logging facade. However, SLF4J is much simpler in design and arguably more robust. In a nutshell, SLF4J avoid the class loader issues that plague JCL.
Do a google for "JCL classloader issues" for more on this...
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