The error as shown on the Noir error page: java.io.FileNotFoundException: Could not locate boundaries/lat_long__init.class or boundaries/lat_long.clj on class path
The code that requires it:
(ns boundaries.views.boundary
(:use noir.core
hiccup.core
hiccup.page-helpers)
(:require
[boundaries.lat-long :as lat-long]
[noir.response :as resp]))
Why is it looking for lat_long instead of the specified lat-long? boundaries/lat-long.clj exists as well as the corresponding boundaries.lat-long namespace.
the JVM does not allow -s in class names so the Clojure compiler converts them to _s
the problem is most likely with the project.clj dependencies.
When diagnosing this sort of issue:
is the namespace available from the REPL?
does the .class file appear in the lib directory for the project?
re-run lein deps
You need to rename the boundaries/lat-long.clj to boundaries/lat_long.clj.
Note that you don't have to change the namespace name. The clojure convention is to use "-" for functions and namespace names.
From Stuart Sierra response at https://stackoverflow.com/a/4451693/151650: "It's a necessary workaround for Java interoperability."
Related
I have implemented a hyphenation algorithm (at namespace hyphenator-clj.core), defined it as org.clojars.nikonyrh.hyphenator-clj 0.1.0 at defproject and pushed it to Clojars. Uberjar seems to have files like core__init.class, core.clj and core.class.
However when I try to use it as a dependency on an other project I get this error:
$ lein uberjar
Retrieving org/clojars/nikonyrh/hyphenator-clj/org.clojars.nikonyrh.hyphenator-clj/0.1.0/org.clojars.nikonyrh.hyphenator-clj-0.1.0.pom from clojars
Retrieving org/clojars/nikonyrh/hyphenator-clj/org.clojars.nikonyrh.hyphenator-clj/0.1.0/org.clojars.nikonyrh.hyphenator-clj-0.1.0.jar from clojars
Compiling example.core
java.io.FileNotFoundException: Could not locate org/clojars/nikonyrh/hyphenator_clj__init.class or org/clojars/nikonyrh/hyphenator_clj.clj on classpath. Please check that namespaces with dashes use underscores in the Clojure file name., compiling:(core.clj:1:1)
Exception in thread "main" java.io.FileNotFoundException: Could not locate org/clojars/nikonyrh/hyphenator_clj__init.class or org/clojars/nikonyrh/hyphenator_clj.clj on classpath. Please check that namespaces with dashes use underscores in the Clojure file name., compiling:(core.clj:1:1)
at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:3657)
at clojure.lang.Compiler.compile1(Compiler.java:7474)
at clojure.lang.Compiler.compile1(Compiler.java:7464)
at clojure.lang.Compiler.compile(Compiler.java:7541)
at clojure.lang.RT.compile(RT.java:406)
at clojure.lang.RT.load(RT.java:451)
at clojure.lang.RT.load(RT.java:419)
at clojure.core$load$fn__5677.invoke(core.clj:5893)
...
Must I change my project's folder structure so that it matches the expected org/clojars/nikonyrh/hyphenator_clj__init.class, or can I somehow override the current behavior? If there is a good tutorial about this out there I would be happy to read it.
Basically I would like to get this example project to work. project.clj:
(defproject example "0.0.1-SNAPSHOT"
:description ""
:dependencies [[org.clojure/clojure "1.8.0"]
[org.clojars.nikonyrh.hyphenator-clj "0.1.0"]]
:javac-options ["-target" "1.6" "-source" "1.6" "-Xlint:-options"]
:aot [example.core]
:main example.core)
src/example/core.clj:
(ns example.core
(:require [org.clojars.nikonyrh.hyphenator-clj :as h])
(:gen-class))
(defn -main [& argv] (doseq [arg argv] (println (h/hyphenate arg :hyphen \-))))
I'm suspecting I also have the english.txt in a wrong directory, as it isn't contained in the uberjar but resource files are an other topic.
You would probably be better off not using a hyphen in the namespace hyphenator-clj. Why not just use hyphenator? But if you do I suspect that the name of the directory should have an underscore in it rather than a hyphen, so be: hyphenator_clj.
If fixing that issue doesn't help then another thing to look out for, which I can't see from your question, is where exactly is core.clj in the directory structure, and does the project.clj reflect that? For instance is the path for the namespace hyphenator-clj.core in a src directory off the root of your project? The root of your project being defined as where the project.clj is located.
Something else that would be good to see in the question is whether you can get the program to work just locally, without having packed it up into an uberjar and shipped it to clojars. My guess would be that it does work locally, but it would help for that to be stated.
Okay taking a look at your links now. You might like to read a working project deployed to clojars, that has hypens in its name, for instance here. The first difference you might notice is the project name you use is rather long: org.clojars.nikonyrh.hyphenator-clj. It should just be hyphenator-clj. Also I would recommend having an identifier ending in "-SNAPSHOT" as that project does.
But taking a look at the bigger picture, a great idea you suggested in the comments is to test without Clojars being in the mix at all. To do this use lein install on the library you want to use from another lein project.
Ahaa at least I understand the process a bit better now, basically my require has to match the structure of the used JAR file, which may be very different from the project's name. For example cc.qbits/spandex is actually required as qbits.spandex.
The english.txt dependency was fixed by moving it to resources folder, deploying the new version to Clojars and importing the dependency as it exists in the JAR:
(ns example.core
(:require [hyphenator-clj.core :as h])
(:gen-class))
(defn -main [& argv] (doseq [arg argv] (println (h/hyphenate arg :hyphen \-))))
In a fresh lein (~2.5) repl, I type:
(require '[clojure.string :as string])
And I can use string as expected. However, when trying to require core.asnc like so, I get an error msg:
(require '[clojure.core.async :as ca])
FileNotFoundException Could not locate clojure/core/async__init.class or clojure/core/async.clj on classpath. clojure.lang.RT.load (RT.java:449)
thanks to your answers I managed now to require arbitrary libs in a repl on runtime using pomegranate or alembic. But what about macros? How - for example - do I get the 'go' macro in the repl? There isn't something like (require-macros ... in analogy to the approach one would take when requiring core.async in a project's ns declaration.
core.async is not part of the clojure.core library. You need to add the core.async jar or sources to your classpath. The easiest way to do this is with a dependency via project.clj, but there are also tools like pomegranate and alembic for doing this at runtime, which could be added to your local profiles.clj.
I am using the following namespace for a graphics demo
(ns foo.core
(:use [clojure.browser.dom :only [get-element]]))
However, I return a File not found exception for clojure browser dom in the classpath.
Clojurescript has been pulled, and is contained within the file I cd into. But is not contained in the file I am trying to load, after having accessed the REPL.
Is clojure.browser.dom out of date? Or, am I missing something within the implementation?
Edit
I have not included the dependency for this file.
That namespace is correct:
https://github.com/clojure/clojurescript/blob/master/src/cljs/clojure/browser/dom.cljs
Maybe the problem is the ns form? Try
(ns foo.core
(:require [clojure.browser.dom :refer [get-element]]))
Also, just in case, be sure to name your file .cljs and restart the cljsbuild compiler, just in case.
I am using a method from the contrib.string libraries but lein is having trouble finding the library.
In my project.clj I have :dependencies [[org.clojure/clojure "1.4.0"]] inside of defproject and then (use '[clojure.string :only (join)]) (use '[clojure.contrib.string :only (as-str)]) inside of src/file.clj
Do I need to add another dependency to include contrib? I have found examples of 1.2, but there seems to have been a shift and the documentation is, well, lacking.
Monolithic contrib is long gone, it had been split into several modules when clojure 1.3.0 was released. Now clojure.string belongs to standard clojure library. There are no as-str function in that namespace, but given its name I assume that you need str function.
UPD: I searched for as-str function and found that it works in the same way as str do, but takes only name of keywords and symbols, ignoring namespace and ':' keyword prefix. I think now you can do it only by writing the same functionality by yourself (I also had to do the same in my recent code).
the contrib.string is merged into clojure.string in clojure-1.4.0.
I'm new to Clojure and Leiningen, and I've determined that some of what I'll want to use is located in clojure.contrib.generic.math-functions. I found API information for that at http://richhickey.github.com/clojure-contrib/branch-1.1.x/math-api.html, but I can't find anything that helps me figure out what I should put into my project.clj file for that dependency.
I have tried [clojure.contrib.generic.math-functions "1.1"], [clojure.contrib.generic.math-functions "1.1.x"], and [clojure.contrib.generic.math-functions "1.1.0"]. For each of those, I get something like...
...
Caused by: org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing:
----------
1) clojure.contrib.generic.math-functions:clojure.contrib.generic.math-functions:jar:1.1
All clojure-contrib namespaces are shipped within a single jar file, for which the dependency has to be listed like:
[org.clojure/clojure-contrib "1.2.0"]
Please note that there are different versions available of that artifact. The 1.2.0 is the current stable release.
In order to use functions coming from the math-functions namespace in your clojure code, you need to either require or use such namespace, usually done within the ns form at the beginning of your source file:
(ns my.namespace
(:use [clojure.contrib.generic.math-functions]))
Have a look here to see the differences between use and require.
The next version of Leiningen will have a search task for precisely this purpose. It will search Clojars, Maven Central, and any other repositories your project has listed, provided they offer up downloadable indices. It's already implemented, so if you run Leiningen from git you can use it.
Also, the Leiningen tutorial covers this. Type "lein help tutorial".
You can generally find what you need at clojars.org - it's the default repository for leiningen. The current stable release of Clojure is 1.2.0, so you'd have this in your leiningen project.clj:
[org.clojure/clojure "1.2.0"]
[org.clojure/clojure-contrib "1.2.0"]
To use the generic math functions in your clojure, require or use it in your namespace declaration at the top of your source file:
(ns your-namespace
(:use [clojure.contrib.generic.math-functions :as mathf]))
This allows you to refer to the functions in that namespace like this:
(mathf/abs -10) ;; => 10
:use-ing namespaces with :as is the preferred way to use functions from other namespaces in your code. require is ok, but you'd have to prefix your functions with the entire namespace (e.g. clojure.contrib.generic.math-functions/abs) so that's not practical. Using a namespace without :as allows you to use these functions without any prefix at all (e.g. abs), but you're more likely to get namespace clashes and it might be difficult to see where functions come from, especially if you :use many libraries.
You can browse all libraries available from the default leiningen repository by checking out http://clojars.org/repo/. The structure of clojure-contrib will change when 1.3.0 is out, so you'll have to include the specific contrib library if you're using version 1.3.0-alpha-xx:
[org.clojure.contrib/generic "1.3.0-alpha4"]
Now that the clojure.contrib has been broken up, the math functions are in something called math.numeric-tower. The lein dependency is specified like this:
[org.clojure/math.numeric-tower "0.0.1"]
You can use or require as seems appropriate, for example
(use '[clojure.math.numeric-tower])