Problem writing module-info.java for gwt modules using jsinterop

hi,

I'm moving a maven java/gwt multi-modules project to java 9 and would like to write module-info.java files also for gwt modules (why not?).

I'm using GWT 2.8.2. Since it doesn't provide java 9 modules info, I need to rely on automatic module names. I wrote my module-info.java as follow:

module my.gwt.module {
...
requires gwt.user; // works
requires jsinterop.annotations; // doesn't work
...
}

The java 9 compiler accepts this file without complaining (no "module not found" error so I guess it finds the modules). And it successfully compiles java files that only uses gwt.user. But compiling java files also using jsinterop fails with the following error:

package jsinterop.annotations is not visible
(package jsinterop.annotations is declared in the unnamed module, but module jsinterop.annotations does not read it)

Any idea why?

I found a workaround by adding a dependency to the jsinterop head snapshot in my pom (also declared the google snapshot repository):

<dependency>
 <groupId>com.google.jsinterop</groupId>
 <artifactId>jsinterop-annotations</artifactId>
 <version>HEAD-SNAPSHOT</version>
</dependency>

and changing my module info to:

module my.gwt.module {
...
requires gwt.user; // works
requires jsinterop.annotations.HEAD.SNAPSHOT; // works
...
}

Then the java 9 compiler successfully compiles java files using jsinterop. But I would prefer not doing this.

Any better solution?

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