JEP 238: Multi-Version JAR Files

Ivan St. Ivanov at
Fri Feb 13 14:41:11 UTC 2015

Hi Richard,

I'm not completely sure. about that. What I know is that JEP 220 (Modular
runtime images) says that a new format should be introduced that will
replace the jar. I guess it is the jmod thing. But I have to double check


On Fri, Feb 13, 2015 at 4:07 PM, Richard Warburton <
richard.warburton at> wrote:

> Hi Ivan,
> 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
>> question.
>> 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)?
> I think either you've got the wrong end of the stick here, or maybe I
> have! My understanding is that the jar format isn't going away. It would
> still be the format used to distribute something like a library. Jigsaw may
> offer other features on top of what a jar offers, but jars would still be
> around.
> regards,
>   Richard Warburton
>   @RichardWarburto <>

More information about the adoption-discuss mailing list