I am following the tutorial from the below URL:
http://www.xuan-wu.com/2013-09-21-Basic-Web-Application-in-Clojure
but i received one error when i execute :
lein ring uberwar
The error is:
Caused by: java.io.FileNotFoundException: Could not locate hiccup/core__init.class or hiccup/core.clj on classpath:...
What I read on another stackoverflow thread :
Hiccup not working : FileNotFoundException: Could not locate ../as__init.class or ../as.clj on classpath
is related to the required namespace without the :as.
(ns myblog.views
(:require [hiccup.core :refer (html)]
.......
Also I tried to simple 'use' it:
(ns myblog.views
(:use hiccup.core)
(:require [hiccup.form :as f]
.......
but i received the same error.
What is wrong in my code? Thanks in advance for any hint/url!
I am copying below the project.clj file:
(defproject dgblog "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:min-lein-version "2.0.0"
:dependencies [[org.clojure/clojure "1.6.0"]
[compojure "1.1.9"]
[org.clojure/java.jdbc "0.3.0-alpha5"]
[mysql/mysql-connector-java "5.1.25"]
[ring-basic-authentication "1.0.2"]]
:plugins [[lein-ring "0.8.12"]]
:ring {:handler dgblog.handler/app}
:profiles
{:dev {:dependencies [[javax.servlet/servlet-api "2.5"]
[ring-mock "0.1.5"]]}})
and the views.clj header :
(ns dgblog.views
(:use hiccup.core)
(:require
;; (:require [hiccup.core :refer (html)]
[hiccup.form :as f]
[dgblog.posts :as posts]))
Related
The below is my app project.clj
(defproject clojure-my-app-api "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:ring {:handler clojure-my-app-api.core/app}
:dependencies [[org.clojure/clojure "1.8.0"]
[metosin/compojure-api "1.1.10"]
[ring/ring-core "1.4.0"]
[ring/ring-jetty-adapter "1.4.0"]]
:main clojure-my-app-api.core)
and my app core.clj is
(ns clojure-my-app-api.core
(:require [ring.adapter.jetty :as jetty])
(:require [compojure.api.sweet :refer :all])
(:require [ring.util.http-response :refer :all]))
(defapi app
(GET "/hello" []
:query-params [name :- String]
(ok {:message (str "Dear " name ", Hello I am here ")})))
(jetty/run-jetty app {:port 3000})
My doubt is, Is it mandatory to put (jetty/run-jetty app {:port 3000}) in every clj class if we have multiple classes for handling multiple API requests.
Can you please help me out is there any single main class mechanism for multiple clj class to handle different API path.
I have modified my code.
project.clj
(defproject clojure-dauble-business-api "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:ring {:handler {clojure-dauble-business-api.core/app
clojure-dauble-business-api.test/test1}}
:repl-options {:init-ns clojure-dauble-business-api.user}
:dependencies [[org.clojure/clojure "1.8.0"]
[metosin/compojure-api "1.1.10"]
[ring/ring-core "1.4.0"]
[ring/ring-jetty-adapter "1.4.0"]]
:main clojure-dauble-business-api.user)
user.clj
(ns clojure-dauble-business-api.user
(:require [ring.adapter.jetty :as jetty])
(:require [compojure.api.sweet :refer :all])
(:require [ring.util.http-response :refer :all])
(:require [clojure-dauble-business-api.core :as core])
(:require [clojure-dauble-business-api.test :as test]))
(jetty/run-jetty (list core/app test/test) {:port 3000})
core.clj
(ns clojure-dauble-business-api.core
(:require [ring.adapter.jetty :as jetty])
(:require [compojure.api.sweet :refer :all])
(:require [ring.util.http-response :refer :all]))
(defapi app
(GET "/hello" []
:query-params [name :- String]
(ok {:message (str "Dear " name ", Hello I am here ")})))
test.clj
(ns clojure-dauble-business-api.test
(:require [ring.adapter.jetty :as jetty])
(:require [compojure.api.sweet :refer :all])
(:require [ring.util.http-response :refer :all]))
(defapi test
(GET "/ping" []
:query-params [name :- String]
(ok {:message (str "Dear " name ", Hello I am here ")})))
Error while running http://localhost:3000/hello?name=acbd endpoint in Postman
2017-07-08 10:46:34.413:WARN:oejs.HttpChannel:qtp191004666-15: /hello?name=abcd
java.lang.ClassCastException: clojure.lang.PersistentList cannot be cast to clojure.lang.IFn
at ring.adapter.jetty$proxy_handler$fn__1401.invoke(jetty.clj:24)
at ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$ff19274a.handle(Unknown Source)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:745)
You shouldn't have (jetty/run-jetty (list core/app test/test) {:port 3000}) in any of your namespaces. (Having it in user.clj is fine for REPL work).
Typically, you have a single handler route that you pass to ring for handing your application.
For example, I generally have a routes namespace that I combine by routes from other namespaces.
So, from your example.
(ns clojure-dauble-business-api.routes
:require [compojure.core :refer :all]
(clojure-dauble-business-api [core :as core]
[test :as t]))
(def app
(routes core/app t/test))
This is what you could pass into Jetty, or refer to in your :ring entry in your project.clj.
:ring {:handler clojure-dauble-business-api.routes}
You're getting the error, because run-jetty must be passed a function, but you're passing it a list instead (because you're trying to consolidate your routes with (list core/app test/test)
I would also add the plugin lein-ring to your project and remove the :main entry. You will also have to correct your :ring entry in your project as above.
I am a newbie too, but hope this helps:
This is how I have implemented. There is one file named user.clj which has
(jetty/run-jetty app {:port 3000})
and other common function that you may specify in main and then in project.clj
:repl-options {:init-ns user}
you can also use injections to load namespaces but I have never used them.
This is my core.clj file
(ns lein-app.core
(:require [compojure.core :refer :all]
[compojure.route :as route]
[ring.middleware.reload :refer [wrap-reload]]))
(use 'ring.adapter.jetty)
(defroutes app
(GET "/" [] "<h1>Hello world</h1>")
(route/not-found "<h1>Not found</h1>"))
(def reloadable-app
(wrap-reload app))
(defn -main
[]
(run-jetty reloadable-app {:port 3000}))
And this is my project.clj
(defproject lein-app "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [
[org.clojure/clojure "1.8.0"]
[compojure "1.5.2"]
[ring "1.5.0"]]
:main lein-app.core)
When I run lein run it starts the server correctly but if I change the GET response to be anything else for example I need to kill the server and restart it.
as indicated in the ring issue#104 the doc is not quite clear.
For wrap-reload (as well for similar functionality in other libs/projects) one has to pass the var itself not the value.
Like so
(wrap-reload #'app)
I have included [clj-time "0.8.0"] in my project.clj. I then refer to clj-time in my namespace like so:
(ns school-finder.tasks
(:require [clj-time.core :as t]))
However when I try and run the project I get the following compilation error:
Exception in thread "main" java.lang.IllegalArgumentException: No single method: second of interface: clj_time.core.DateTimeProtocol found for function: second of protocol: DateTimeProtocol, compiling:(clj_time/coerce.clj:146:64)
What am I doing wrong?
I think this is a known bug: https://github.com/clj-time/clj-time/issues/124
If you just do a lein clean (possibly followed by a lein deps) that should solve it.
It's hard to say where the problem is, so here's a working example:
project.clj:
(defproject hello "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.5.1"]
[clj-time "0.8.0"]]
:source-paths ["dev"])
src/hello/core.clj:
(ns hello.core
(:require [clj-time.core :as t]))
(println (t/now))
I'm just beginning with clojure and I'm trying to build a small web app. I wanted to try out hiccup but it doesn't seem to be working. My code is below.
Project.clj
(defproject WebTest "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:dependencies [[org.clojure/clojure "1.4.0"]
[compojure "1.1.5"]
[hiccup "1.0.3"]
[org.clojure/java.jdbc "0.2.3"]
[net.sourceforge.jtds/jtds "1.2.4"]
]
:plugins [[lein-ring "0.8.2"]
[lein-idea "1.0.1"]]
:ring {:handler WebTest.handler/app}
:profiles
{:dev {:dependencies [[ring-mock "0.1.3"]]}})
handler.clj
(ns WebTest.handler
(:use compojure.core)
(:require [compojure.handler :as handler]
[compojure.route :as route]
[WebTest.Content :as pages]
[hiccup.core :as templ]))
(defroutes app-routes
(GET "/" [] (templ/html [h1 "Hello world"]))
(GET "/Greeting/:name" [name] (str "<h1>Hello " name "</h1>"))
(GET "/Date/:year/:month/:day" [year month day] (str "<h1>It is " month "/" day "/" year "</h1>"))
(route/not-found "Not Found"))
(def app
(handler/site app-routes))
And the error that I get is
Exception in thread "main" java.io.FileNotFoundException: Could not locate hiccu
p/core/as__init.class or hiccup/core/as.clj on classpath:
at clojure.lang.RT.load(RT.java:432)
at clojure.lang.RT.load(RT.java:400)
at clojure.core$load$fn__4890.invoke(core.clj:5415)
at clojure.core$load.doInvoke(core.clj:5414)
A very long stack trace follows that. Any insight into what I'm doing wrong?
Attempting to require WebTest.Content as you do fails for me, Though the rest works fine if I remove that one:
(ns WebTest.handler
(:use compojure.core)
(:require [compojure.handler :as handler]
[compojure.route :as route]
;[WebTest.Content :as pages]
[hiccup.core :as templ]))
The error you mention would be the case if there where mismatched []s in the :require section of handler.clj's ns form though they are not caused by it as you show it.
Exception: Exception in thread "main" java.io.FileNotFoundException: Could not locate hiccup/form_helpers__init.class or hiccup/form_helpers.clj on classpath:
I'm trying to get a toy compojure app up and running. The original app was from CloudBees and their ClickStart app for Clojure/Compojure. I'm trying to add a simple form (that won't persist anything yet) using hiccup form_helpers but I'm getting a ClassNotFound exception. Here's what I've done:
project.clj:
(defproject mywebapp "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:dependencies [[org.clojure/clojure "1.4.0"]
[compojure "1.1.1"]
[hiccup "1.0.1"]]
:plugins [[lein-ring "0.7.3"]]
:ring {:handler mywebapp.routes/app}
:profiles
{:dev {:dependencies [[ring-mock "0.1.3"]]}})
views.clj:
(ns mywebapp.views
(:use [hiccup core page]
[hiccup form-helpers :only [form-to label text-area submit-button]]))
...
(defn shout-form []
[:div {:id "shout-form" }
(form-to [:post "/form"]
(label "shout" "What do you want to SHOUT?")
[:br]
(text-area "shout")
[:br]
(submit-button "SHOUT!"))])
...
Ah, looks like I just had an old example of forms in hiccup. form_helpers was from a previous version.
if I change my views.clj file from this:
(:use [hiccup form-helpers])
to look like this:
(:use [hiccup form])
(and presumably this would work though i haven't tested it):
(:use [hiccup form :only [form-to label text-area submit-button]])
I don't get the error anymore.
To clarify: the package used to be called "form_helpers" and is now simply called "form".