Clojure scraper - java.lang.OutOfMemoryError: Java heap space

ajax.clj

(ns logs.views.ajax
  (:import java.net.URL)
  (:require [logs.views.common :as common]
            [noir.content.pages :as pages]
            [net.cgrand.enlive-html :as html]
            [clj-time.core :as time]
            [clj-time.format :as time-format])
  (:use [clojure.string :only [trim]]
        [noir.core]
        [hiccup.core]
        [hiccup.page-helpers]))

(def log-url "http://*****************")
(def ericsson-date-format (time-format/formatter "yyyy-MM-dd' at 'HH:mm:ss"))
(def ericsson-timezone (time/time-zone-for-offset -5))

(defn fetch [url]
  (html/html-resource (java.net.URL. url)))

(defn rows [resource]
  (html/select resource [:tr]))

(defn parse-date [date-string]
  (let [dt (-> (time-format/parse ericsson-date-format date-string)
               (time/from-time-zone ericsson-timezone))]
    (time-format/unparse ericsson-date-format dt)))

(defn parse-row [row]
  (let [row (map (comp trim html/text) (html/select row [:td]))]
    (conj (rest row) (parse-date (first row)))))

(defn fetch-logs []
  (map parse-row (rest (rows (fetch log-url)))))

(defpage [:get "/ajax"] {}
  (let [log-entries (fetch-logs)]
    (if (empty? log-entries)
      (common/json-response 503 "Unavaliable")
      (common/json-response 200 {:aaData log-entries}))))

common.clj

(ns logs.views.common
  (:use [clojure.data.json :only [json-str]]))

(defn json-response [code m]
  {:status code
   :headers {"Content-Type" "application/json"}
   :body (json-str m)})

stack trace

java.lang.OutOfMemoryError: Java heap space
	at sun.net.www.http.ChunkedInputStream.processRaw(ChunkedInputStream.java:336)
	at sun.net.www.http.ChunkedInputStream.readAheadNonBlocking(ChunkedInputStream.java:493)
	at sun.net.www.http.ChunkedInputStream.readAhead(ChunkedInputStream.java:584)
	at sun.net.www.http.ChunkedInputStream.hurry(ChunkedInputStream.java:741)
	at sun.net.www.http.ChunkedInputStream.closeUnderlying(ChunkedInputStream.java:198)
	at sun.net.www.http.ChunkedInputStream.close(ChunkedInputStream.java:722)
	at java.io.FilterInputStream.close(FilterInputStream.java:155)
	at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.close(HttpURLConnection.java:2743)
	at net.cgrand.enlive_html$load_html_resource$fn__2545.invoke(enlive_html.clj:53)
	at net.cgrand.enlive_html$load_html_resource.invoke(enlive_html.clj:53)
	at net.cgrand.enlive_html$fn__2569.invoke(enlive_html.clj:102)
	at clojure.lang.MultiFn.invoke(MultiFn.java:167)
	at net.cgrand.enlive_html$html_resource.invoke(enlive_html.clj:69)
	at logs.views.ajax$fetch.invoke(ajax.clj:18)
	at logs.views.ajax$fetch_logs.invoke(ajax.clj:33)
	at logs.views.ajax$GET__ajax.invoke(ajax.clj:36)
	at logs.views.ajax$fn__3213.invoke(ajax.clj:35)
	at compojure.core$if_route$fn__296.invoke(core.clj:39)
	at compojure.core$if_method$fn__289.invoke(core.clj:24)
	at compojure.core$routing$fn__311.invoke(core.clj:98)
	at clojure.core$some.invoke(core.clj:2388)
	at compojure.core$routing.doInvoke(core.clj:98)
	at clojure.lang.RestFn.applyTo(RestFn.java:139)
	at clojure.core$apply.invoke(core.clj:602)
	at compojure.core$routes$fn__315.invoke(core.clj:103)
	at noir.server.handler$init_routes$fn__2259.invoke(handler.clj:48)
	at noir.request$wrap_request_map$fn__2200.invoke(request.clj:14)
	at ring.middleware.keyword_params$wrap_keyword_params$fn__441.invoke(keyword_params.clj:21)
	at ring.middleware.nested_params$wrap_nested_params$fn__478.invoke(nested_params.clj:64)
	at ring.middleware.params$wrap_params$fn__418.invoke(params.clj:76)
	at ring.middleware.multipart_params$wrap_multipart_params$fn__511.invoke(multipart_params.clj:102)
	at ring.middleware.session$wrap_session$fn__666.invoke(session.clj:40)