Hi Stephan,
there is something wrong from your side, it works for me :)

/usr/jdk/jdk-9-b175/bin/javap --module-path target/main/exploded/ --module 
fr.umlv.asm.test module-info
Compiled from "module-info.java"
module fr.umlv.asm.test {
  requires java.base;
  requires org.objectweb.asm.all.debug;
  exports fr.umlv.asm.test;
}

/usr/jdk/jdk-9-b175/bin/javap -m java.base module-info
Compiled from "module-info.java"
module java.base@9 {
  exports sun.reflect.generics.reflectiveObjects to
    java.desktop;
  exports java.util;
  exports java.lang.ref;
  exports jdk.internal.misc to
    java.rmi,
    java.sql,
    jdk.jshell,
...

cheers,
Rémi

----- Mail original -----
> De: "Stephan Herrmann" <stephan.herrm...@berlin.de>
> À: jigsaw-dev@openjdk.java.net
> Envoyé: Samedi 1 Juillet 2017 17:08:20
> Objet: javap cannot read module-info.class

> compile an arbitrary module-info.java and then:
> 
> $ javap module-info.class
>  Error: error while reading constant pool for /tmp/bin/module-info.class:
>  unexpected tag at #5: 19
> 
> From tweaking the Eclipse compiler it seems that javap is expecting a
> CONSTANT_Utf8_info,
> where according to JVMS 4.7.25 a CONSTANT_Module_info is required.
> 
> JVMS and javac agree, so javap is the odd man out.
> 
> Stephan
> 
> PS: build is 9+175

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