如何从 jar 运行 maven 打包的 clojure 应用程序
我在 src/main/clojure/za/co/pb/maven_test/test.clj 文件中有以下内容：
(ns za.co.pb.maven-test.test
(:gen-class))
(defn -main []
(println "Hello world!"))
我还有一个 POM，它对 clojure-maven-plugin 具有必要的依赖关系，其中编译执行。
如果我执行 mvn package 命令，我会得到一个 target/maven-test-1.0-SNAPSHOT.jar 文件，如果我查看类文件夹，我会在其中找到这些文件文件夹target/classes/za/co/pb/maven_test：
test.classtest.cljtest__init.class>test$loading__4410__auto__.classtest$_main.class
据我所知，这是合适的。
但是，当我运行以下命令时：
java -cp target\app-1.0-SNAPSHOT.jar za.co.pb.maven_test.test
我得到以下信息：
Exception in thread "main" java.lang.NoClassDefFoundError: clojure/lang/IFn
Caused by: java.lang.ClassNotFoundException: clojure.lang.IFn
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: za.co.pb.maven_test.test. Program will exit.
I have the following contents in src/main/clojure/za/co/pb/maven_test/test.clj file:
(ns za.co.pb.maven-test.test
(:gen-class))
(defn -main []
(println "Hello world!"))
I also have a POM that has the necesary dependencies on clojure-maven-plugin with the compile execution.
If I execute a mvn package command, I get a target/maven-test-1.0-SNAPSHOT.jar file and if I look in the classes folder I have these files in the folder target/classes/za/co/pb/maven_test:
test.classtest.cljtest__init.classtest$loading__4410__auto__.classtest$_main.class
This, as far as I know, is appropriate.
However, when I run this command:
java -cp target\app-1.0-SNAPSHOT.jar za.co.pb.maven_test.test
I get this:
Exception in thread "main" java.lang.NoClassDefFoundError: clojure/lang/IFn
Caused by: java.lang.ClassNotFoundException: clojure.lang.IFn
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: za.co.pb.maven_test.test. Program will exit.
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类路径中没有 clojure jar。您可以按照 Stuart 的响应嵌入它们，或者如果您不喜欢将所有依赖项嵌入到单个 jar 中，则可以使用依赖项插件和 jar 插件来使其正常工作。
请参阅：http://groups.google.com/group/enclojure/msg/87159854fcb0e708 进行摘要（注意，链接的帖子中有一个拼写错误，该包应称为“foo”）。
You don't have the clojure jars in the classpath. You can either embed them as per Stuart's response, or if you don't like having all the dependencies embedded in a single jar, you can use the dependency plugin and the jar plugin to get this working nicely.
See: http://groups.google.com/group/enclojure/msg/87159854fcb0e708 for a summary (note, there's a typo in the linked post, the package should be called "foo").
您需要生成一个包含项目所有依赖项的 JAR 文件。 Maven Assembly Plugin 使用内置的
jar-with-dependencies描述符为您完成此操作。You need to generate a JAR file file that includes all the dependencies of your project. The Maven Assembly Plugin does this for you, using the built-in
jar-with-dependenciesdescriptor.如果您使用 leiningen，在使用
lein uberjar生成 jar 后，请勿使用 < code>java -jar target/your-name.jar，但使用java -jar target/your-name-standalone.jar。boot也是如此。If you are using leiningen, after generating the jar with
lein uberjar, do not usejava -jar target/your-name.jar, but usejava -jar target/your-name-standalone.jar.Same thing for
boot.所有依赖项都可用吗？我不熟悉 clojure.lang.IFn 类。是来自外部图书馆吗？如果是，您是否用提供的范围标记了依赖关系？
Are all dependencies available ? I'm not familiar with the clojure.lang.IFn class. Is it from an external library? If it is did you marked the dependency with the provided scope?