How Do I Create A Simple Module In Java?

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1 How do I create a simple module in Java?

Problem Description:

I have a very simple library with classes in one package. As far as I know, it only depends on things in java.base. I added a module-info.java to the top level directory that exports this package.

e.g.

module org.foo.bar {
    exports org.foo.bar.pkgname;
}

I then just built a simple jar file with my classes and the module-info class.

Is that it, or is there more that I need to do?

Solution – 1

That’s it, as long as your jar is organized as follows:

module-info.class
org
 foo
  bar
   pkgname
    X.class
    Y.class

A jar with a module-info.class at top level is a module.
You can check your module with:

jar --describe-module --file bar.jar

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