ApplicationMain.java

public class ApplicationMain {

    public static void main(String[] args) {
        get("/hello", (request, response) -> "world");
    }

}

ApplicationMain2.java

public class ApplicationMain {

   public static void main(String[] args) {
        Logger logger = Logger.getLogger(ApplicationMain.class);
        SparkUtils.createServerWithRequestLog(logger);

        get("/hello", (request, response) -> "world");
    }

}

EmbeddedJettyFactoryConstructor .java

public class EmbeddedJettyFactoryConstructor {
    AbstractNCSARequestLog requestLog;

    public EmbeddedJettyFactoryConstructor(AbstractNCSARequestLog requestLog) {
        this.requestLog = requestLog;
    }

    EmbeddedJettyFactory create() {
        return new EmbeddedJettyFactory((maxThreads, minThreads, threadTimeoutMillis) -> {
            Server server;
            if (maxThreads > 0) {
                int max = maxThreads > 0 ? maxThreads : 200;
                int min = minThreads > 0 ? minThreads : 8;
                int idleTimeout = threadTimeoutMillis > 0 ? threadTimeoutMillis : '\uea60';
                server = new Server(new QueuedThreadPool(max, min, idleTimeout));
            } else {
                server = new Server();
            }

            server.setRequestLog(requestLog);
            return server;
        });
    }
}

RequestLogFactory .java

public class RequestLogFactory {

    private Logger logger;

    public RequestLogFactory(Logger logger) {
        this.logger = logger;
    }

    AbstractNCSARequestLog create() {
        return new AbstractNCSARequestLog() {
            @Override
            protected boolean isEnabled() {
                return true;
            }

            @Override
            public void write(String s) throws IOException {
                logger.info(s);
            }
        };
    }
}

SparkUtils .java

public class SparkUtils {
    public static void createServerWithRequestLog(Logger logger) {
        EmbeddedJettyFactory factory = createEmbeddedJettyFactoryWithRequestLog(logger);
        EmbeddedServers.add(EmbeddedServers.Identifiers.JETTY, factory);
    }

    private static EmbeddedJettyFactory createEmbeddedJettyFactoryWithRequestLog(org.apache.log4j.Logger logger) {
        AbstractNCSARequestLog requestLog = new RequestLogFactory(logger).create();
        return new EmbeddedJettyFactoryConstructor(requestLog).create();
    }
}