Getting started with liberator - clojure

Question

I am new to clojure and liberator.
I am trying to get started with liberator but I am stuck on the following error.
Here is my code that starts the webserver and defines the routes:
(ns game-of-life.core
(:require
[ring.util.response :as resp]
[compojure.route :as route]
[ring.adapter.jetty :as jetty])
(:use
[ring.middleware.multipart-params :only [wrap-multipart-params]]
[ring.util.response :only [header]]
[compojure.core :only [context ANY routes defroutes]]
[compojure.handler :only [api]]))
(defn assemble-routes []
(->
(routes
(ANY "/" [] (resp/redirect "/index.html"))
(route/resources "/"))))
(def handler
(-> (assemble-routes))
(defn start [options]
(jetty/run-jetty #'handler (assoc options :join? false)))
(defn -main
([port]
(start {:port (Integer/parseInt port)}))
([]
(-main "3000")))
When I run lein ring server, I get a java.lang.NullPointerException with the following stacktrace:
reload.clj:18 ring.middleware.reload/wrap-reload[fn]
stacktrace.clj:17 ring.middleware.stacktrace/wrap-stacktrace-log[fn]
stacktrace.clj:80 ring.middleware.stacktrace/wrap-stacktrace-web[fn]
jetty.clj:18 ring.adapter.jetty/proxy-handler[fn] (Unknown
Source) ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$0.handle
HandlerWrapper.java:116 org.eclipse.jetty.server.handler.HandlerWrapper.handle
Server.java:363 org.eclipse.jetty.server.Server.handle
AbstractHttpConnection.java:483 org.eclipse.jetty.server.AbstractHttpConnection.handleRequest
AbstractHttpConnection.java:920 org.eclipse.jetty.server.AbstractHttpConnection.headerComplete
AbstractHttpConnection.java:982 org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete
HttpParser.java:635 org.eclipse.jetty.http.HttpParser.parseNext
HttpParser.java:235 org.eclipse.jetty.http.HttpParser.parseAvailable
AsyncHttpConnection.java:82 org.eclipse.jetty.server.AsyncHttpConnection.handle
SelectChannelEndPoint.java:628 org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle
SelectChannelEndPoint.java:52 org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run
QueuedThreadPool.java:608 org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
QueuedThreadPool.java:543 org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
Thread.java:744 java.lang.Thread.run

Answer 1

I think it will work better if your handler function get the request argument.

Answer 2

Can you try changing the dependencies like this? These versions and the following config totally works for me: (including reloading)
(defproject ..........
:dependencies [[org.clojure/clojure "1.5.1"]
[liberator "0.11.0"]
[ring/ring-core "1.1.8"]
[ring/ring-jetty-adapter "1.1.8"]
[compojure "1.1.3"]]
:main game-of-life.core
:min-lein-version "2.0.0"
:plugins [[lein-ring "0.8.10"]]
:ring {:handler game-of-life.core/handler})
Plus the handler should be
(def handler
(-> (assemble-routes)))