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slf4j Hibernate has migrated to using slf4j as the logging framework. A significant difference between the two is that slf4j requires that users (at least) select which logging backend they want to use. This is accomplished by defining a dependency on the appropriate logging bridge (slf4j-log4j for example) if using maven or by dropping any needed jars on your classpath. See Steve's module blog [http://in.relation.to/9384.lace] entry for details.