JEP 238: Multi-Version JAR Files

Ivan St. Ivanov at
Fri Feb 13 12:21:30 UTC 2015

Hi everybody,

I saw this in the morning and didn't dare to comment in the core libs
group, but I guess that the adoption mailing list is good enough for my

So, in Java 9 we are hopefully going to have Jigsaw. One of its features is
retiring the jar format. Yes, the jar will still be supported for the sake
of backward compatibility, but I don't get why they plan to enhance it
further with this feature. The reason "we are going to downport it to Java
8u60" does not hold in my books.

Am I the only one that feels that this is spending time and resources on
feature that OpenJDK plans to replace (the jar format)?


On Fri, Feb 13, 2015 at 1:58 PM, Martijn Verburg <martijnverburg at>

> Hi all,
> Please share the below with your communities, thanks!
> Cheers,
> Martijn
> ---------- Forwarded message ----------
> From: Paul Sandoz <paul.sandoz at>
> Date: 12 February 2015 at 20:52
> Subject: Re: JEP 238: Multi-Version JAR Files
> To: core-libs-dev at
> Hi
> In connection with the JEP there is also a design document to help the
> discussion:
> We are especially interesting in hearing feedback from library developers,
> tool/IDE developers, and anyone doing funky stuff with class loading and
> JAR files.
> Paul.
> On Feb 12, 2015, at 9:41 PM, mark.reinhold at wrote:
> > New JEP Candidate:
> >
> > - Mark

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