CNFE when resolving "required" dependency

[Aleksey Shipilev]

Hi,

I'm refreshing my performance tests for Jigsaw, and realized my
November-old scenarios are broken on current Jigsaw builds. They used to
work just fine in November.

The basic idea was to explore how multimodule library performs. For
that, my home-brew generator can generate chains of modules, which
require each other in DAG-like way. However, even the reduced scenario
of sample.root -> sample.module0 dependency appears not to be working.

This is what I have:

$ cat library-c1-d1/modules/sample.root/module-info.java
module sample.root at 1.0 {
  requires sample.module0 at 1.0;
  class sample.root.Entry;
}

$ cat library-c1-d1/modules/sample.root/sample/root/Entry.java
package sample.root;

public class Entry {
    public static void sayHello() {
        System.err.println("Hello from module sample.root");
        sample.module0.Entry.sayHello();
    }
    public static void main(String[] args) {
        sayHello();
    }
}

$ cat library-c1-d1/modules/sample.module0/module-info.java
module sample.module0 at 1.0 {
  class sample.module0.Entry;
}

$ cat library-c1-d1/modules/sample.module0/sample/module0/Entry.java
package sample.module0;

public class Entry {
    public static void sayHello() {
        System.err.println("Hello from module sample.module0");
    }
    public static void main(String[] args) {
        sayHello();
    }
}

Now the fun part. After compiling it, creating library, etc., this is
what I got:

$ jdk-module-image/bin/java -L library-c1-d1 -m sample.root
Hello from module sample.root
Exception in thread "main" java.lang.NoClassDefFoundError:
sample/module0/Entry
	at sample.root.Entry.sayHello(Entry.java:6)
	at sample.root.Entry.main(Entry.java:9)
Caused by: java.lang.ClassNotFoundException: sample.module0.Entry :
requested by +sample.root
	at org.openjdk.jigsaw.Loader.loadClass(Loader.java:113)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	... 2 more

...then one could argue sample.module0 is indeed missing. However, doing
this on the same library succeeds:

$ jdk-module-image/bin/java -L library-c1-d1 -m sample.module0
Hello from module sample.module0

Is it something dumb I'm missing here? Or is it a bug?

The library itself is somewhat heavy (~100 Kb compressed), so I can send
it out off list.

Thanks,
Aleksey.