Problem deploying ring-1.6.0-beta5 uberwar with async in jetty9

_error

clojure.lang.ArityException: Wrong number of args (1) passed to: core/handler
	at clojure.lang.AFn.throwArity(AFn.java:429)
	at clojure.lang.AFn.invoke(AFn.java:32)
	at clojure.lang.Var.invoke(Var.java:379)
	at lein_ring_test.listener$_contextInitialized$fn__11.invoke(listener.clj:1)
	at ring.util.servlet$make_service_method$fn__85.invoke(servlet.clj:129)
	at lein_ring_test.servlet$_service.invokeStatic(servlet.clj:1)
	at lein_ring_test.servlet$_service.invoke(servlet.clj:1)
	at lein_ring_test.servlet.service(Unknown Source)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:837)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.server.Server.handle(Server.java:524)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:319)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
	at java.lang.Thread.run(Thread.java:745)

core.clj

(ns lein-ring-test.core)

(defn handler
  [request respond raise]
  (respond
    {:status 200
    :headers {"Content-Type" "text/plain"}
    :body "hello world"}))

project.clj

(defproject lein-ring-test "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.8.0"]
                 [ring "1.6.0-beta5"]]
  :plugins [[lein-ring "0.9.7"]]
  :ring {:handler lein-ring-test.core/handler
         :adapter {:async? true}})