在Clojure REPL中使用自定义Java类 [英] Using custom Java classes in Clojure REPL
问题描述
在Eclipse中，使用CCW插件，我想将clojure文件加载到REPL中。问题是，我有一个import语句为我自己的java类，但显然不是在我的类路径。
In Eclipse, using the CCW plug-in, I want to load a clojure file into a REPL. The problem is that I have an import statement for one of my own java classes, but apparently it is not in my classpath.
(ns my-clj-ns
(:import [alg.gen Enumerator]))
我必须在Clojure REPL中使用/测试每个类吗？
Do I have to make jars out of every class that I want use/test in a Clojure REPL?
目前，尝试将我的clj加载到REPL中会导致错误：
在Clojure REPL中加载文件未正常完成。有关详细信息，请参阅日志。
java.lang.NullPointerException
Currently, trying to load my clj into a REPL results in an error: "Load file in Clojure REPL" did not complete normally. Please see the log for more information. java.lang.NullPointerException
任何帮助将非常感激。
推荐答案
您的代码对我来说很好。
Your code looks fine to me.
我怀疑问题是您的Eclipse Java Build Path Eclipse包含在您的应用程序的类路径中。
I suspect the issue is with your Eclipse Java Build Path, which determines what Eclipse includes in the classpath for your application.
特别是，如果您的Java类位于单独的项目中，您需要将该项目添加到构建路径右键单击项目/ Properties / Java Build Path / Projects）或将其打包为jar。
In particular, if your Java class is in a separate project, you will need to either add that project to the build path (right click on project / Properties / Java Build Path / Projects) or package it as a jar.
当你开始有更复杂的构建需求时，开始查看 Maven 来为您处理这类事情。 Maven是一个痛苦学习/设置在第一，但它支付的长期。
When you start to have more sophisticated build requirements, you may also want to start looking at Maven to handle this kind of thing for you. Maven is a pain to learn / set up in the first place but it pays of in the long run.
Leiningen 也是一个很好的工具但我个人不使用它的原因如下：
Leiningen is also a great tool to use but I personally don't use it for the following reasons:
- 它在命令行上很好，但是没有集成这么好使用Eclipse工作流程
- Maven在Java世界中使用更广泛，并得到更好的支持
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