Hello world of clojure + compojure + google app engine (smallest working set)

README

NOTE: colons in file names are directory separators (which are not allowed in gist...)
NOTE2: Actually it doesn't like colons either, so all files are here twice now and I can't remove them.... Have fun with them :)
NOTE3: Very likely the appengine dependency is not even needed. Doesn't hurt though and is most likely useful later....


These 4 files will make a project that runs on appengine.

To run:
lein dep
lein compile
$GAESDK/bin/dev_appserver.sh war

Deploy with:
$GAESDK/bin/appcfg.sh update war


Works 2012-6-5

Inspiration: http://pseudofish.com/blog/2010/09/18/learning-clojure-with-google-app-engine-and-emacs/

project.clj

(defproject sopbase "1.0.0-SNAPSHOT"
  :description "***"
  :aot [sopbase.core]
  :dependencies [[org.clojure/clojure "1.3.0"]
                 [compojure "1.1.0"]
                 [appengine "0.4.3-SNAPSHOT"]
                 [ring/ring-servlet "1.1.0"]]
  :plugins [[lein-ring "0.7.1"]]
  :ring {:handler sopbase.core/app}
  :compile-path "war/WEB-INF/classes"
  :library-path "war/WEB-INF/lib")

src:sopbase:core.clj

(ns sopbase.core
  (:use compojure.core)
  (:gen-class :extends javax.servlet.http.HttpServlet)
  (:require [compojure.route :as route]
            [compojure.handler :as handler]
            [ring.util.servlet :as servlet]))


(defroutes main-routes
  (GET "/" [] "<h1>HELLO SOPPERS</h1>It works!")
  (route/resources "/")
  (route/not-found "Page not found"))

(servlet/defservice main-routes)

srcsopbasecore.clj

(ns sopbase.core
  (:use compojure.core)
  (:gen-class :extends javax.servlet.http.HttpServlet)
  (:require [compojure.route :as route]
            [compojure.handler :as handler]
            [ring.util.servlet :as servlet]))


(defroutes main-routes
  (GET "/" [] "<h1>HELLO SOPPERS</h1>It works!")
  (route/resources "/")
  (route/not-found "Page not found"))

(servlet/defservice main-routes)

war:WEB-INF:appengine-web.xml

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  <application>sopbase</application>
  <version>1</version>
  <static-files />
  <resource-files />
  <threadsafe>false</threadsafe>
</appengine-web-app>

war:WEB-INF:web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
  <display-name>Sopbase</display-name>
  <servlet>
    <servlet-name>sopbase</servlet-name>
    <servlet-class>sopbase.core</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>sopbase</servlet-name>
    <url-pattern>/*</url-pattern>
  </servlet-mapping>
</web-app>

warWEB-INFappengine-web.xml

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  <application>sopbase</application>
  <version>1</version>
  <static-files />
  <resource-files />
  <threadsafe>false</threadsafe>
</appengine-web-app>

warWEB-INFweb.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
  <display-name>Sopbase</display-name>
  <servlet>
    <servlet-name>sopbase</servlet-name>
    <servlet-class>sopbase.core</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>sopbase</servlet-name>
    <url-pattern>/*</url-pattern>
  </servlet-mapping>
</web-app>