为什么Java抱怨没有找到命名空间？ [英] Why does Java complain that namespace is not found?

问题描述

我试图在Linux上从成功的构建环境在Windows 7上设置一个lein构建环境。我有maven和jdk与lein一起安装。

I am trying to set up a lein build environment on Windows 7 haven copied files from a successful build environment on Linux. I have maven and the jdk installed along with lein.

HOME指向maven目录所在的 c：\Users \cnorton 。

HOME points to c:\Users\cnorton where the maven directories are located.

当试图运行lein repl或lein编译时，我得到这个错误，无法弄清楚我做错了什么。

I get this error when trying to run lein repl or lein compile, and cannot figure out what I am doing wrong.

Caused by：java.lang.Exception：加载'/ repl_test / core'后找不到命名空间'repl-test.core'

Caused by: java.lang.Exception: namespace 'repl-test.core' not found after loading '/repl_test/core'

这里是project.clj

Here is project.clj

(defproject repl-test "0.0.1-SNAPSHOT"
  :description "TODO: add summary of your project"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.clojure/clojure-contrib "1.2.0"]
                 [clojure-csv/clojure-csv "1.2.4"]
                 [org.clojure/tools.cli "0.1.0"]
                 [clj-http "0.1.3"]]
   :aot [repl-test.core]
   :main repl-test.core)

这是src / repl_test / core.clj

Here is the first part of src/repl_test/core.clj

(ns repl-test.core
  (:gen-class)
  (:use clojure.contrib.command-line)
  (:require [clojure.contrib.string :as cstr])
  (:require [clojure.contrib.trace :as ctr])
  (:require [clojure.string :as sstr])
  (:use clojure-csv.core))

$ b b

如果有人可以发布一个project.clj和一个core.clj的头部，允许项目是一个主要的。如果有人可以超级有用。

I would be super helpful if someone could post as an answer a project.clj and the header of a core.clj that allows the project to be a main.

推荐答案

我会避免在你的文件夹名称和命名空间中的 - ，它实际上是转换为_，但不是在所有地方。

I would avoid "-" in your folder names and namespaces, it is actually converted to "_" but not in all places.

以下内容可能适用于您，也可能不适用。我有你的骨骼项目使用：

The following may or may not work for you. I got your skeleton project working with:

(defproject st1 "1.0.0-SNAPSHOT"
:description "TODO: add summary of your project"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.clojure/clojure-contrib "1.2.0"]
                 [clojure-csv/clojure-csv "1.2.4"]
                 [org.clojure/tools.cli "0.1.0"]
                 [clj-http "0.1.3"]]
                 :aot [repl_test.core]
                 :main repl_test.core)

您有：

 (ns repl_test.core
  (:gen-class)
  (:use clojure.contrib.command-line)
  (:require [clojure.contrib.string :as cstr])
  (:require [clojure.contrib.trace :as ctr])
  (:require [clojure.string :as sstr])
  (:use clojure-csv.core))

我已将文件夹 repl-test 重命名为 repl_test ，并使用下划线。

And I renamed the folder repl-test to repl_test with underscore.

b
$ b

Then

 lein compile

和

 lein run

b $ b

通过好奇心，我还查看了 clojure-csv ，他们是使用 - 无处不在，除了文件夹名称，所以可能有幸运复制他们做了什么。

By curiosity, I also looked at clojure-csv, and they are using "-" everywhere, except in the folder name, so may have luck copying what they did.

此外，引用：

Also, quoting another SO question on clojure namespaces:

>还要注意，不要使用命名空间名称中的下划线或文件名中的连字符，并且无论在命名空间名称中使用连字符，都必须在文件名中使用下划线（以便ns my.cool-project定义在一个名为cool_project.clj的文件中，名为my）。

"Also note that you musn't use the underscore in namespace names or the hyphen in filenames and wherever you use a hyphen in a namespace name, you must use an underscore in the filename (so that the ns my.cool-project is defined in a file called cool_project.clj in a directory called my)."

从 Clojure编程Wiki 部分：
Clojure尊重目录和文件的Java命名约定，但命名空间名称的Lisp命名约定。因此，Clojure命名空间com.my-app.utils将位于名为com / my_app / utils.clj的路径中。特别注意下划线/连字符的区别。

And from the Clojure Programming Wiki section on java packages: "Clojure respects Java naming conventions for directories and files, but Lisp naming conventions for namespace names. So a Clojure namespace com.my-app.utils would live in a path named com/my_app/utils.clj. Note especially the underscore/hyphen distinction."

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