Question

I’d like to create one jar file to execute that is implemented with java and clojure. This is the step that I took.

Making my java code call clojure code

I could generate a jar file (ThingOne-1.0.0-SNAPSHOT-standalone.jar) that has clojure core and my clojure code, and I also could get a class file (HelloJava.class) that uses the clojure code in the jar file by following this site – http://walkwithoutrhythm.net/blog/2012/03/26/how-to-call-clojure-1-dot-3-functions-from-java/

The java code is as follows: clojure code is imported as ThingOne

import ThingOne.*;

public class HelloJava {
    public static void main(String[] args) {
        System.out.println("Hello from Java!");
        core.foo (12345);
    }
}

I can run this command to use the code:

java -cp 'ThingOne-1.0.0-SNAPSHOT-standalone.jar:.' HelloJava

Making one jar file

I made one jar directory that has this structure.

├── MANIFEST.MF
└── jar
    └── ThingOne-1.0.0-SNAPSHOT-standalone.jar

The content of MANIFEST.MF is

Manifest-Version: 0.1
Main-Class: HelloJava
Class-Path: jar/ThingOne-1.0.0-SNAPSHOT-standalone.jar

I could get one jar file with jar cvfm hello.jar jar/MANIFEST.MF HelloJava.class.

However, the clojure jar file (ThingOne-1.0.0-SNAPSHOT-standalone.jar) is not included in this jar file, but just referenced.

How can I make one jar file that contains the java class file and clojure jar file?

Answer 1

If you want to make an all-inclusive jar, use tools like:

• Jar Jar Links
• one-JAR™

If you specifically want to package jar files, you need a custom classloader, like:

• JarClassLoader

That said, I’d consider Dao Wen’s suggestion, unless you have a specific need it cannot meet.