Configurar trazas simples por consola
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.SimpleLayout;
ConsoleAppender appender = new ConsoleAppender(new SimpleLayout(), "System.out") ;
appender.setThreshold(Level.INFO);
BasicConfigurator.configure(appender);