(需要)函数的clojure类路径问题? [英] clojure classpath problem for (require) function?

问题描述

CLASSPATH 将/Users/smcho/Desktop/clojure"作为其路径之一，该目录包含文件 hello.clj.

运行 clojure，然后运行 ​​(require 'hello) 给出这个错误信息.

<前>java.io.FileNotFoundException: 无法在类路径上找到 hello__init.class 或 hello.clj: (NO_SOURCE_FILE:0)

当我将目录更改为/Users/.../clojure"并运行相同的(需要 'hello)时，没有问题.这 .位于 CLASSPATH 上.

运行

<前>java -cp/Users/smcho/bin/jar/clojure.jar:/Users/smcho/Desktop/clojure clojure.lang.Repl

也有效.

为什么clojure在CLASSPATH上找不到源码?

解决方案

就像 Alex 提到的，如果你用 -cp 参数启动 java，那么 CLASSPATH 环境就不会被引用.所以，而不是

java -cp/Users/smcho/bin/jar/clojure.jar clojure.lang.Repl

使用

java -cp/Users/smcho/bin/jar/clojure.jar:$CLASSPATH clojure.lang.Repl

您可以从 Clojure repl 中检查您的 java 类路径:

(doseq [p (.getURLs (java.lang.ClassLoader/getSystemClassLoader))] (println (.getPath p)))

CLASSPATH has the "/Users/smcho/Desktop/clojure" as one of its path, and this directory has the file hello.clj.

Running clojure, and running (require 'hello) give this error message.

java.io.FileNotFoundException: Could not locate hello__init.class or hello.clj on classpath:  (NO_SOURCE_FILE:0)

When I change directory to "/Users/.../clojure", and run the same (require 'hello), there's no problem. The . is on the CLASSPATH.

Running

java -cp /Users/smcho/bin/jar/clojure.jar:/Users/smcho/Desktop/clojure clojure.lang.Repl

also works.

Why clojure can't find the source on the CLASSPATH?

解决方案

Like Alex mentioned, if you start java with the -cp argument, then the CLASSPATH environment is not referenced. So, instead of

java -cp /Users/smcho/bin/jar/clojure.jar clojure.lang.Repl

use

java -cp /Users/smcho/bin/jar/clojure.jar:$CLASSPATH clojure.lang.Repl

You can examine your java classpath from within the Clojure repl:

(doseq [p (.getURLs (java.lang.ClassLoader/getSystemClassLoader))] (println (.getPath p)))

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