net.sf.jnati:jnati and net.sf.jnati:jnati-core depend in compile-time on log4j. The code should be refactored to depend on commons-logging API or slf4j, otherwise it is not possible to customize the logging, which is hardcoded in log4j.properties in resources.
Or optionally, jnati may depend on log4j with <scope>optional</scope>.