Attempted transliteration of vert.x echo server in Java to Clojure

echo.java

package org.vertx.java.examples.echo;

import org.vertx.java.core.Handler;
import org.vertx.java.core.net.NetSocket;
import org.vertx.java.core.streams.Pump;
import org.vertx.java.deploy.Verticle;

public class EchoServer extends Verticle {

    public void start() {
        vertx.createNetServer().connectHandler(new Handler<NetSocket>() {
                public void handle(final NetSocket socket) {
                    Pump.createPump(socket, socket).start();
                }
            }).listen(1234);
    }
}

verticals.clj

(ns verticals.core
  (:import [org.vertx.java.core Handler]
           [org.vertx.java.core.net NetSocket]
           [org.vertx.java.core.streams Pump]
           [org.vertx.java.deploy Verticle]))


(defn start-server
  "I don't do a whole lot."
  [& args]
  (proxy [Verticle] []
    (start []
      (.. (. this vertx)
          (.createNetServer)
          (.connectHandler
           (proxy [Handler] []
             (handle [socket]
               (.startx (Pump/createPump socket socket)))))
          (.listen 1234)))))

;; running these at the REPL doesn't work of course
;(def xx (start-server))                                                                                                                                                                                                           
;(.start xx)