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As of Wicket 1.3.0, Wicket uses the SLF4J project for logging. SLF4J is similar to commons-logging, in that it allows libraries/frameworks like Wicket to avoid forcing a choice of logging framework on their users.

To make this work in your application, you need to pick a static binding to use. Without one, Wicket will fail to start properlymust choose an SLF4J logging implementation. Most people use log4j. If you do, just include slf4j-log4j12.jar on your classpath to get Wicket to use log4j too. If you want to use commons-logging or JDK14 logging or something else, please see the SLF4J site for more information.

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