import org.slf4j.LoggerFactory;
import org.slf4j.Logger;
// ...
private static final Logger LOG = LoggerFactory.getLogger(HelloWorld.class);
import org.slf4j.LoggerFactory
import org.slf4j.Logger
// ...
// For Object
val logger = LoggerFactory.getLogger(HelloWorld.getClass)
// For Class
val logger = org.apache.log4j.Logger.getLogger(classOf[HelloWorld])