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SLF4J - Simple Logging Facade for Java
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"The Simple Logging Facade for Java or (SLF4J) serves as a simple 
facade or abstraction for various logging frameworks, e.g. 
java.util.logging, log4j and logback, allowing the end user to plug in 
the desired logging framework at deployment time. "

For more information:
http://www.slf4j.org/