// === jetty-deploy.xml ===

        DeploymentManager deployer = new DeploymentManager();
        deployer.setContexts(contexts);
        deployer.setContextAttribute(
                "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern",
                ".*/servlet-api-[^/]*\.jar$");

        WebAppProvider webapp_provider = new WebAppProvider();
        webapp_provider.setMonitoredDirName("jetty_base/webapps");
        //webapp_provider.setDefaultsDescriptor("jetty_base/webapps/webdefault.xml");
        webapp_provider.setScanInterval(1);
        webapp_provider.setExtractWars(true);
        webapp_provider.setConfigurationManager(new PropertiesConfigurationManager());

        deployer.addAppProvider(webapp_provider);
        server.addBean(deployer);


        org.eclipse.jetty.util.log.Log.setLog(new org.eclipse.jetty.util.log.StdErrLog());
        //Log.setLog(new Slf4jLog());

INFO in ch.qos.logback.classic.LoggerContext[default]