commons-logging
+
log4j
↓
SLF4J(Simple Logging Facade for Java)http://www.slf4j.org/
+
logback http://logback.qos.ch/
commons-logging
+
log4j
↓
SLF4J(Simple Logging Facade for Java)http://www.slf4j.org/
+
logback http://logback.qos.ch/