How to use jigsaw with Java 9

Question

I am trying to experiment with project Jigsaw as per this link http://openjdk.java.net/projects/jigsaw/doc/quickstart.html

However, I cant find jmod command in the Java 9 early access build. Similarly, javac emits an error message saying

javac: invalid flag: -modulepath".

Any idea? What is the best way to experiment with Jigsaw in Java 9?

Answer 1

Although the preparatory JEP 201 and JEP 220 are both present as of JDK 9 build 41, the main Jigsaw work for JSR 376 is not yet present.

In response to a similar question on the mailing list, about that quickstart guide:

This is a quick start documentation from the original Jigsaw prototype of a few years ago, I guess it's a reminder that some of these obsolete pages needs to be updated to make it clear that they are obsolete.

and about the current state of the work:

JSR 376 is just starting and so there isn't a JEP for the module system yet. It will all come in time.

So, as of March 2015, the OpenJDK 9 builds don't include Jigsaw support. The jigsaw-dev mailing list is the best place to look for progress. It also confirms that status:

So too early to be looking for options like -modulepath.

It's likely that Jigsaw-specific builds will be made available ahead of inclusion in the regular JDK 9 builds.

Answer 2

There are now early access builds available with Jigsaw