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Re: [cross-project-issues-dev] Eclipse plug-ins as automatic modules in Java 9?

On Fri, Oct 6, 2017 at 10:34 AM, Ed Willink <ed@xxxxxxxxxxxxx> wrote:
> Hi
>
> "I propose to make this a rule"
>
> Do you mean an informal good practice
>
> or a Manifest editor warning and a quick fix

^^ is probably best. It would be nice if someone opens PDE bug with the details.

>
> or a Manifest builder automated edit?
>
>     Regards
>
>         Ed Willink
>
>
>
> On 05/10/2017 22:10, Stephan Herrmann wrote:
>>
>> Hi,
>>
>> I just noticed by chance that none of the artifacts we are producing
>> are consumable as "automatic modules" in Java 9 speak.
>>
>> The reason is: JPMS defines an algorithm how names for automatic modules
>> are derived from the jar file name. Unfortunately, the spec expects any
>> version to be separated from the name by "-", whereas our files use "_".
>>
>> As a result a jar file like
>>    org.eclipse.equinox.common_3.9.0.v20170207.jar
>> is interpreted as an automatic module named
>>    org.eclipse.equinox.common.3.9.0.v20170207
>> (cutting off the version fails, then "_" is converted to ".").
>>
>> Since that module name is not a legal Java identifier, the given jar file
>> cannot be referenced in any "requires" clause of a Java 9 module.
>>
>> While all this is very unfortunate, Java 9 provides a means for a
>> systematic
>> solution: adding an Automatic-Module-Name header to MANIFEST.MF.
>>
>> Hence, I propose to make this a rule for future releases that all bundles
>> should have this manifest header, where the value should be identical to
>> the value of Bundle-SymbolicName.
>>
>> There may not yet be any consumers of Eclipse plug-ins as Java 9 modules,
>> but as we know that several of our artifacts are being consumed outside
>> OSGi,
>> I am sure that clients will expect our artifacts to be consumable as Java
>> 9
>> modules sooner or later. And then a general solution looks cleaner to me
>> then doing this for selected artifacts only.
>>
>> best,
>> Stephan
>>
>> Reference for naming of automatic modules:
>>
>> http://cr.openjdk.java.net/~mr/jigsaw/spec/api/java/lang/module/ModuleFinder.html#of-java.nio.file.Path...-
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>
>
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-- 
Alexander Kurtakov
Red Hat Eclipse Team