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From Cédric Champeau <>
Subject Re: Loading groovy as a Jigsaw auto-module
Date Mon, 04 Dec 2017 09:28:58 GMT
Oh thanks for the clarification, Jochen, I didn't realize the problem was
with Maven itself. I think Maven over-interprets the spec. It's not because
you find a file in `META-INF/services` that it *must* be a service

Now for the extension mechanism, for sure we need to check what it means
for us.

2017-12-04 10:23 GMT+01:00 Jochen Theodorou <>:

> Just to clarify things... This is a maven plugin complaining, not JDK9, as
> I see it. Afaik the plugin tries to create a module configuration for
> groovy and cannot interpret the services provided in those directories.
> JDK9 would not care, unless you say your module is providing a certain
> service.
> And I want to add two more points: The extension mechanism is unlikely to
> work as intended on JDK9. If you want to provide a service across modules
> you are now forced to use the very doubtful ServiceProvider infrastructure.
> And one module to read a file from another module was at least till late
> stages of JDK9 not possible. I am not sure what the latest state here was.
> Maybe I did interpret something wrong - writing a test for this would be
> easy.
> But if I am right, this would mean our extension mechanism must become a
> SPI structure to enable other modules to provide extension modules.
> Am 03.12.2017 um 19:01 schrieb Cédric Champeau:
>> This file is used by Groovy internally, there's no reason for the JDK to
>> interpret its contents since it has only a meaning for Groovy. In short, it
>> declares the list of extensions recognized by the Groovy compiler. That it
>> prevents loading as a module is rather strange.
>> 2017-12-03 16:37 GMT+01:00 Ceki Gulcu < <>>:
>>     Hi all,
>>     Referring to a discussion on the maven users list [1], it appears that
>>     removing the file
>>     META-INF/services/org.codehaus.groovy.source.Extensions from
>>     groovy-2.4.13.jar allows Java 9 to successfully load
>>     groovy-2.4.13.jar as an auto-module.
>>     The org.codehaus.groovy.source.Extensions file contains the lone
>>     word "groovy" instead of a fully qualified class name.
>>     Please advise.
>>     Best regards,
>>     --
>>     Ceki Gülcü
>>     [1]
>>     <>

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