如何运行leiningen创建的项目？

Question

我正在运行Debian Wheezy,openjdk-7-jre,clojure 1.4.0和leiningen-1.7.1,都是从官方仓库安装的.

所以我跑了

lein new hello
cd hello
lein run -m hello.core

并看到一个错误:

Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: hello.core
at clojure.lang.Util.runtimeException(Util.java:165)
at clojure.lang.RT.classForName(RT.java:2017)
at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:206)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:92)
at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:225)
at user$eval35.invoke(NO_SOURCE_FILE:1)
at clojure.lang.Compiler.eval(Compiler.java:6465)
at clojure.lang.Compiler.eval(Compiler.java:6455)
at clojure.lang.Compiler.eval(Compiler.java:6431)
at clojure.core$eval.invoke(core.clj:2795)
at clojure.main$eval_opt.invoke(main.clj:296)
at clojure.main$initialize.invoke(main.clj:315)
at clojure.main$null_opt.invoke(main.clj:348)
at clojure.main$main.doInvoke(main.clj:426)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:405)
at clojure.lang.AFn.applyToHelper(AFn.java:163)
at clojure.lang.Var.applyTo(Var.java:518)
at clojure.main.main(main.java:37)
Caused by: java.lang.ClassNotFoundException: hello.core
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at clojure.lang.DynamicClassLoader.findClass(DynamicClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at clojure.lang.RT.classForName(RT.java:2013)
... 21 more

我以前从未在Java中写过任何东西,所以这对我来说非常神秘.我试着补充一下

:main hello.core

到我的project.clj文件,然后只是

lein run

但它没有帮助我.

Answer 1

要运行该main函数,请确保hello.core包含如下-main方法:

(ns hello.core)

(defn -main
  [& args]
  (println "Hello, World!"))

你可以用-m旗子运行它:lein run -m hello.core.

或者,如果指定其名称,则可以运行任意函数:

(ns hello.core)

(defn my-run
  [& args]
  (println "Hello, World! from Run"))

并使用namespace/function_name作为参数调用它:

lein run -m hello.core/my-run