An example Compojure project
This is an example web application that uses Ring and Compojure. It demonstrates basic routing and embedded resources.
To play around with this example project, you will first need Leiningen installed.
Download the project dependencies with:
lein deps
Now you can start a development web server with:
lein ring server
Or you can compile the project into a war-file ready for deployment to a servlet container like Tomcat or Jetty:
lein ring uberwar
I'm getting a StackOverflowError when running lein ring server, ending with Subprocess failed.
The stacktrace looks like this:
Exception in thread "main" java.lang.StackOverflowError
at clojure.lang.APersistentSet.iterator(APersistentSet.java:155)
at clojure.core.protocols$fn__5871.invoke(protocols.clj:73)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at ns_tracker.dependency$transitive.invoke(dependency.clj:15)
at ns_tracker.dependency$transitive$fn__748.invoke(dependency.clj:14)
at clojure.core.protocols$fn__5871.invoke(protocols.clj:76)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at ns_tracker.dependency$transitive.invoke(dependency.clj:15)
at ns_tracker.dependency$transitive$fn__748.invoke(dependency.clj:14)
at clojure.core.protocols$fn__5871.invoke(protocols.clj:76)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at ns_tracker.dependency$transitive.invoke(dependency.clj:15)
at ns_tracker.dependency$transitive$fn__748.invoke(dependency.clj:14)
repeating...
I'm trying to add a web frontend to an existing app. lein run still works fine. Any ideas? I've been tweaking deps/versions in project.clj for hours to no avail.
Upgrade to version 1.1.2 of compojure,
was running "lein ring uberwar", there is no reaction
In 1.1.1 there was no problem.
The compilation, but to sleep in the code below.
Could you confirm? Thank you.
The existing example is too simple. Please consider including examples of session and flash.
Maybe it would be better to use lein ring server-headless to run the server as I imagine most people will be running this from a terminal.
When I ran it using lein ring server I get:
Exception in thread "main" java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)
at java.awt.Window.<init>(Window.java:536)
at java.awt.Frame.<init>(Frame.java:420)
at java.awt.Frame.<init>(Frame.java:385)
at javax.swing.JFrame.<init>(JFrame.java:181)
at clojure.java.browse_ui$open_url_in_swing.invoke(browse_ui.clj:20)
at clojure.lang.Var.invoke(Var.java:415)
at clojure.java.browse$open_url_in_swing.invoke(browse.clj:44)
at clojure.java.browse$browse_url.invoke(browse.clj:52)
at ring.server.standalone$open_browser_to.invoke(standalone.clj:39)
at ring.server.standalone$serve$fn__1506.invoke(standalone.clj:102)
at ring.server.standalone$try_port.invoke(standalone.clj:16)
at ring.server.standalone$serve.doInvoke(standalone.clj:95)
at clojure.lang.RestFn.invoke(RestFn.java:423)
at ring.server.leiningen$serve.invoke(leiningen.clj:20)
at user$eval2054.invoke(form-init2066820887519135966.clj:1)
at clojure.lang.Compiler.eval(Compiler.java:6511)
at clojure.lang.Compiler.eval(Compiler.java:6501)
at clojure.lang.Compiler.load(Compiler.java:6952)
at clojure.lang.Compiler.loadFile(Compiler.java:6912)
at clojure.main$load_script.invoke(main.clj:283)
at clojure.main$init_opt.invoke(main.clj:288)
at clojure.main$initialize.invoke(main.clj:316)
at clojure.main$null_opt.invoke(main.clj:349)
at clojure.main$main.doInvoke(main.clj:427)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:419)
at clojure.lang.AFn.applyToHelper(AFn.java:163)
at clojure.lang.Var.applyTo(Var.java:532)
at clojure.main.main(main.java:37)
Since the version of lein-ring (0.3.2) specified in project.clj does not work with leningen 1.6.0 or above due to a bug with lein-ring, I changed the lein-ring version to the latest 0.4.5 which fixed the bug. However, the uberwar created with lein-ring 0.4.5 does not work for tomcat. The style.css cannot be found. The war created by 0.3.2 (using leningen 1.5.2) works though.
The difference between the wars created by 0.4.5 and that by 0.3.2 is the location of the "public" directory, it is under WEB-INF/classes for 0.4.5 whereas it is under root for 0.3.2.
I think this creates a difficulty situation for users. Basically, the latest versions of lein-ring and leningen do not work together for compojure-example project.
From the amount of discussions on the groups, it seems the placement of resources to work well for both lein-ring and war deployment is problematic. Could you investigate this more, and create a updated version of this compojure-example project that works with lein-ring 0.4.5?
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