Standalone Nashorn bound to specific JVM flavors?

[Remi Forax]

----- Mail original -----
> De: "BURRIS Thomas" <Thomas.BURRIS at 3ds.com>
> À: "Attila Szegedi" <szegedia at gmail.com>
> Cc: "nashorn-dev" <nashorn-dev at openjdk.java.net>
> Envoyé: Lundi 23 Novembre 2020 18:32:37
> Objet: RE: Standalone Nashorn bound to specific JVM flavors?

> Hi Attila -- Just to clarify to make sure I understand... So the target JVM
> flavor for compatibility with Standalone Nashorn will be HotSpot? And -- at
> least at the moment -- there are no explicit plans to make compatible with (for
> example) OpenJ9 (aside from turning off anon-classes)?

OpenJ9 doesn't support constant pool patching of live objects, the last parameter of defineAnonymousClass.
Nashorn uses defineAnonymousClass with null as last argument so it should work with OpenJ9.

> 
> As for your question: for our usage, we would not have a need for a lower class
> version. Can't speak for others...
> 
> thanks for your time!
> 
> Best Regards,
> Thomas BURRIS
> RDF Modeling R&D Software Architecture Director

regards,
Rémi

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> 
> -----Original Message-----
> From: Attila Szegedi <szegedia at gmail.com>
> Sent: Monday, November 23, 2020 11:59 AM
> To: BURRIS Thomas <Thomas.BURRIS at 3ds.com>
> Cc: nashorn-dev at openjdk.java.net
> Subject: Re: Standalone Nashorn bound to specific JVM flavors?
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> 
> It has exactly one dependency on sun.misc.Unsafe - a call to
> defineAnonymousClass. I’m not aware if that’s available on other JVMs or not,
> but that might be the only issue I’m aware of. FWIW, Nashorn can be used with
> --anonymous-classes=false to turn this feature off (it’s a bit of an
> optimization.)
> 
> As it is, I meant to publish the initial version with javac compiling for Java
> 15, as I presumed nobody would be interested in using it on earlier Java
> versions as 14 comes with Nashorn included. I have not released it _just yet_
> to Maven central (there’s some permission snags on Sonatype OSS). I’m wondering
> if there’d be value in compiling with a lower target class version?
> 
> Attila.
> 
>> On 2020. Nov 23., at 17:32, BURRIS Thomas <Thomas.BURRIS at 3ds.com> wrote:
>>
>> Hi Attila (et. al.) - is there a pre-requisite between the "standalone" Nashorn
>> and the origin of the JVM ? For example, would it possible to run the future
>> stand-alone Nashorn and AdoptOpenJDK with OpenJ9 (rather than HotSpot) ?
>>
>>
>> Best Regards,
>>
>> Thomas BURRIS
>>
>> RDF Modeling R&D Software Architecture Director
>>
>>
>>
>>
>>
>> Office: +1 78 1810 3718
>> Mobile: +1 61 7678 9158
>> thomas.burris at 3ds.com<mailto:Thomas.BURRIS at 3ds.com>
>>
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