I think Rebel Labs or Plumbr have some metrics about JDK usage.

On Wed, Jan 14, 2015 at 10:21 PM, Hank Grabowski <h...@applieddefense.com>
wrote:

> Java 8 has only been out for less than a year.  There is still a sizable
> percentage of groups that have not converted up to Java 8 for myriad
> reasons.  While I was surprised that we are requiring backwards
> compatibility with the ten year old Java 5 I think jumping all the way to
> requiring Java 8 may be a bit too much of a stretch.  I would vote for a
> minimum required version of Java 7 with the ability to run in Java 8.  I
> wish I could find metrics to quantify the penetration of each of the JDKs,
> but my gut says Java 7 would a reasonable cutoff.
>
> On Tue, Jan 13, 2015 at 8:31 PM, Gilles <gil...@harfang.homelinux.org>
> wrote:
>
> > Raising this issue once again.
> >>> Are we going to upgrade the requirement for the next major release?
> >>>
> >>>  [ ] Java 5
> >>>  [ ] Java 6
> >>>  [ ] Java 7
> >>>  [ ] Java 8
> >>>  [ ] Java 9
> >>>
> >>
> > Counts up to now:
> >
> > Java 7      -> 2
> > Java 7 or 8 -> 2
> > Java 8      -> 2
> >
> > Any more opionions?
> >
> > Gilles
> >
> >
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