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FAQ
Hi There ;

I am new to clojure. My question is: Whats the common practice when it
comes to deploying webapps built on compojure? running via lein ring server
or creating a war file ? I would also like to know which is the best way
to put load configuration files i.e using properties file... or using a
reader to load .clj file with a hashmap def?

Kind regards.
Josh

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  • Oleksandr Petrov at Jan 9, 2013 at 10:24 am ⇧
    We're using that technique for both long-running server processes and small
    web applications, i've covered in a blog post some time ago:
    http://coffeenco.de/articles/how_to_deploy_clojure_code.html

    Basically, create a jar and run it from a jar.

    If you don't want to embed jetty, you can deploy to jetty container.
    If you want to have uninterrupted deployments, use nginx and multiple sever
    socket backends, kill old app after new app's startup.

    As reg. configuration, you can check out a little application I wrote on
    GitHub:
    Here's a config file:
    https://github.com/ifesdjeen/upload-challenge/blob/master/config/production.clj
    Here's a primitive way to read it:
    https://github.com/ifesdjeen/upload-challenge/blob/master/src/uploadchallenge/conf.clj

    There are also scripts for deployment and so on, kind of a complete setup:
    https://github.com/ifesdjeen/upload-challenge

    Not sure how common our practice is, but we do it that way.

    Have fun!
    On Wed, Jan 9, 2013 at 12:38 AM, Josh Kamau wrote:


    I am new to clojure. My question is: Whats the common practice when it
    comes to deploying webapps built on compojure? running via lein ring server
    or creating a war file ? I would also like to know which is the best way
    to put load configuration files i.e using properties file... or using a
    reader to load .clj file with a hashmap def?


    --
    alex p

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  • Phil Hagelberg at Jan 9, 2013 at 6:26 pm ⇧

    Josh Kamau writes:

    I am new to clojure. My question is: Whats the common practice when it
    comes to deploying webapps built on compojure? running via lein ring server
    or creating a war file ? I would also like to know which is the best way
    to put load configuration files i.e using properties file... or using a
    reader to load .clj file with a hashmap def?
    I recommend simply embedding jetty and writing a -main function that
    uses run-jetty. Then you can just ship an uberjar out to deploy. You can
    also use `lein trampoline with-profile production run -m myapp.main` if
    you take care that the dependencies are resolved once on your CI server
    rather than each time the app is launched; see the end of `lein help
    tutorial` for details about that.

    You can generate a skeleton app using `lein new heroku myapp` that
    contains the needed -main function even if you're not deploying on Heroku.

    Another option is to generate an uberwar if you are familiar with the
    ecosystem around .war files already. But if not it's easy to just use
    jetty and treat a web application like you would any other Clojure app.

    -Phil
  • John Gabriele at Jan 9, 2013 at 8:58 pm ⇧

    On Wednesday, January 9, 2013 1:26:07 PM UTC-5, Phil Hagelberg wrote:

    I recommend simply embedding jetty and writing a -main function that
    uses run-jetty. Then you can just ship an uberjar out to deploy.
    Ok. Suppose I've got a stock webapp generated via

    lein new compojure my-webapp

    I can of course (thanks to the nice template and lein-ring) run this
    sparkling new webapp via `lein ring server`.

    In src/my_webapp/handler.clj I've got an ns declaration, a `(defroutes
    app-routes (GET ...) ... (route/not-found ...))`, and a `(def app
    (handler/site app-routes))`. That's it.

    What would I need to do in order to embed jetty so I can create an uberjar
    (`lein uberjar`) and deploy it (I suppose via: `java -jar
    my-webapp-0.1.0-standalone.jar &`)?

    What would need to be added to / changed in the project.clj?

    What exactly should the `-main` look like?

    Thanks!
    ---John

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  • Phil Hagelberg at Jan 9, 2013 at 9:09 pm ⇧

    John Gabriele writes:

    What would I need to do in order to embed jetty so I can create an uberjar
    (`lein uberjar`) and deploy it (I suppose via: `java -jar
    my-webapp-0.1.0-standalone.jar &`)?

    What would need to be added to / changed in the project.clj?

    What exactly should the `-main` look like?
    All it takes is this in project.clj:

    [ring/ring-jetty-adapter "1.1.6"]

    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))

    Of course adjust #'app to wrap with middleware appropriate for your app.
    The batteries-included (drawbridge, wrap-error-page, cookie sessions)
    template is here:

    https://github.com/technomancy/lein-heroku/blob/master/lein-template/src/leiningen/new/heroku/web.clj

    -Phil

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  • Murphy McMahon at Jan 9, 2013 at 9:23 pm ⇧
    Thanks to technomancy for the very nice basic Clojure webapp template. Very
    cool.

    On Wed, Jan 9, 2013 at 7:08 PM, Phil Hagelberg wrote:


    John Gabriele writes:
    What would I need to do in order to embed jetty so I can create an uberjar
    (`lein uberjar`) and deploy it (I suppose via: `java -jar
    my-webapp-0.1.0-standalone.jar &`)?

    What would need to be added to / changed in the project.clj?

    What exactly should the `-main` look like?
    All it takes is this in project.clj:

    [ring/ring-jetty-adapter "1.1.6"]

    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))

    Of course adjust #'app to wrap with middleware appropriate for your app.
    The batteries-included (drawbridge, wrap-error-page, cookie sessions)
    template is here:


    https://github.com/technomancy/lein-heroku/blob/master/lein-template/src/leiningen/new/heroku/web.clj

    -Phil

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  • John Gabriele at Jan 9, 2013 at 9:28 pm ⇧

    On Wednesday, January 9, 2013 4:08:50 PM UTC-5, Phil Hagelberg wrote:

    John Gabriele writes:
    What would I need to do in order to embed jetty so I can create an uberjar
    (`lein uberjar`) and deploy it (I suppose via: `java -jar
    my-webapp-0.1.0-standalone.jar &`)?

    What would need to be added to / changed in the project.clj?

    What exactly should the `-main` look like?
    All it takes is this in project.clj:

    [ring/ring-jetty-adapter "1.1.6"]
    Ok. Added that to project.clj's :dependencies vector.

    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))
    Ok. That also meant I had to add the bare `jetty` to the ns's :require.

    Was able to create the standalone jar (`lein uberjar`), but could not run
    it ("Failed to load Main-Class"). Here's the project.clj:

    ~~~clojure
    (defproject my-webapp "0.1.0-SNAPSHOT"
    :description "FIXME: write description"
    :url "http://example.com/FIXME"
    :dependencies [[org.clojure/clojure "1.4.0"]
    [compojure "1.1.3"]
    [ring/ring-jetty-adapter "1.1.6"]]
    :plugins [[lein-ring "0.7.5"]]
    :ring {:handler my-webapp.handler/app}
    :profiles
    {:dev {:dependencies [[ring-mock "0.1.3"]]}})
    ~~~

    I'm guessing there's a `:main` missing in there. What should its value be?

    ---John

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  • John Gabriele at Jan 9, 2013 at 9:39 pm ⇧

    On Wednesday, January 9, 2013 4:27:57 PM UTC-5, John Gabriele wrote:
    On Wednesday, January 9, 2013 4:08:50 PM UTC-5, Phil Hagelberg wrote:


    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))
    Ok. That also meant I had to add the bare `jetty` to the ns's :require.

    Wait. No. That can't be right.
    The `ns` in src/my_webapp/handler.clj should probably be:

    ~~~clojure
    (ns my-webapp.handler
    (:use compojure.core)
    (:require [compojure.handler :as handler]
    [compojure.route :as route]
    [ring.adapter.jetty :as jetty]))
    ~~~

    Still though, need to add a :main to project.clj I think.

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  • John Gabriele at Jan 9, 2013 at 9:58 pm ⇧

    On Wednesday, January 9, 2013 4:39:06 PM UTC-5, John Gabriele wrote:

    Still though, need to add a :main to project.clj I think.

    BTW, tried `:main my-webapp.handler`. `lein uberjar` succeeds, but when I
    try to run the jar (via `java -jar
    my-webapp-0.1.0-SNAPSHOT-standalone.jar`), it fails with:

    ~~~
    Exception in thread "main" java.lang.NoClassDefFoundError: my_webapp/handler
    Caused by: java.lang.ClassNotFoundException: my_webapp.handler
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    Could not find the main class: my_webapp.handler. Program will exit.
    ~~~

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  • Aaron Cohen at Jan 9, 2013 at 10:03 pm ⇧

    On Wed, Jan 9, 2013 at 4:27 PM, John Gabriele wrote:
    On Wednesday, January 9, 2013 4:08:50 PM UTC-5, Phil Hagelberg wrote:


    John Gabriele writes:
    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))
    What namespace is main.clj defining? It needs to have :gen-class added to
    it.

    Minimally, it could be

    (ns my-webapp.main
    [[some dependencies here]]
    :gen-class)

    You could also move -main into my-webapp.handler (and add :gen-class to
    that ns declaration).


    ~~~clojure
    (defproject my-webapp "0.1.0-SNAPSHOT"
    :description "FIXME: write description"
    :url "http://example.com/FIXME"
    :dependencies [[org.clojure/clojure "1.4.0"]
    [compojure "1.1.3"]
    [ring/ring-jetty-adapter "1.1.6"]]
    :plugins [[lein-ring "0.7.5"]]
    :ring {:handler my-webapp.handler/app}
    :profiles
    {:dev {:dependencies [[ring-mock "0.1.3"]]}}
    :main my-webapp.main

    )
    ~~~

    I'm guessing there's a `:main` missing in there. What should its value be?
    Yes, it needs to be whatever the name of the namespace is that contains
    your -main function. That namespace must have :gen-class in its definition.

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  • John Gabriele at Jan 9, 2013 at 10:21 pm ⇧

    On Wednesday, January 9, 2013 5:03:49 PM UTC-5, Aaron Cohen wrote:
    On Wed, Jan 9, 2013 at 4:27 PM, John Gabriele <jmg...@gmail.com<javascript:>
    wrote:
    On Wednesday, January 9, 2013 4:08:50 PM UTC-5, Phil Hagelberg wrote:


    John Gabriele writes:
    and this in main.clj:

    (defn -main [& [port]]
    (let [port (Integer. (or port (System/getenv "PORT") 5000))]
    (jetty/run-jetty #'app {:port port :join? false}))))
    What namespace is main.clj defining? It needs to have :gen-class added to
    it.

    Minimally, it could be

    (ns my-webapp.main
    [[some dependencies here]]
    :gen-class)
    Ooof. Of course. It needed a `(:gen-class)` at the end of handler.clj's ns
    macro.

    Works now. :) Thanks!

    ---John

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  • Phil Hagelberg at Jan 10, 2013 at 12:30 am ⇧

    John Gabriele writes:

    Ooof. Of course. It needed a `(:gen-class)` at the end of handler.clj's ns
    macro.
    You don't actually need gen-class, you can do a fully-non-AOT'd uberjar
    and just invoke it with -cp instead of -jar:

    $ java -cp myproject-1.0.0-standalone.jar clojure.main -m myproject.main 8080

    But it's not a bad idea to do a full AOT during builds just to catch
    errors earlier and improve boot time.

    -Phil

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  • John Gabriele at Jan 10, 2013 at 3:35 am ⇧
    Thanks, all. Updated CDS basic web dev tut with this deployment info.

    ---John

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  • Kinleyd at Jan 10, 2013 at 5:48 am ⇧
    Yes, thank you all. This was a very useful thread.
    On Thursday, January 10, 2013 9:35:38 AM UTC+6, John Gabriele wrote:

    Thanks, all. Updated CDS basic web dev tut with this deployment info.

    ---John
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  • Josh Kamau at Jan 10, 2013 at 1:48 pm ⇧
    Thanks for all the contribution in thread.

    Josh

    On Thu, Jan 10, 2013 at 8:48 AM, kinleyd wrote:

    Yes, thank you all. This was a very useful thread.

    On Thursday, January 10, 2013 9:35:38 AM UTC+6, John Gabriele wrote:

    Thanks, all. Updated CDS basic web dev tut with this deployment info.

    ---John

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  • Tony Pitluga at Jan 9, 2013 at 9:13 pm ⇧
    I found this example:
    https://gist.github.com/raw/887596/d5804f1e7c550cd4c25e1194c58190e816ceadb0/core.clj

    here:
    http://www.myclojureadventure.com/2011/03/getting-started-with-ring-and-compojure.html

    Just substitute your app-routes for handler and put the (run-jetty) form in
    your -main method.

    Tony


    On Wed, Jan 9, 2013 at 2:58 PM, John Gabriele wrote:
    On Wednesday, January 9, 2013 1:26:07 PM UTC-5, Phil Hagelberg wrote:


    I recommend simply embedding jetty and writing a -main function that
    uses run-jetty. Then you can just ship an uberjar out to deploy.
    Ok. Suppose I've got a stock webapp generated via

    lein new compojure my-webapp

    I can of course (thanks to the nice template and lein-ring) run this
    sparkling new webapp via `lein ring server`.

    In src/my_webapp/handler.clj I've got an ns declaration, a `(defroutes
    app-routes (GET ...) ... (route/not-found ...))`, and a `(def app
    (handler/site app-routes))`. That's it.

    What would I need to do in order to embed jetty so I can create an uberjar
    (`lein uberjar`) and deploy it (I suppose via: `java -jar
    my-webapp-0.1.0-standalone.jar &`)?

    What would need to be added to / changed in the project.clj?

    What exactly should the `-main` look like?

    Thanks!
    ---John

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John Gabriele: 6 posts Phil Hagelberg: 3 posts Josh Kamau: 2 posts Oleksandr Petrov: 1 post Murphy McMahon: 1 post Aaron Cohen: 1 post Kinleyd: 1 post Tony Pitluga: 1 post

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