JEP 238: Multi-Version JAR Files

Richard Warburton richard.warburton at
Fri Feb 13 14:07:47 UTC 2015

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.


  Richard Warburton
  @RichardWarburto <>

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