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MapReduce >> mail # dev >> Re: Moving to JDK7, JDK8 and new major releases

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Re: Moving to JDK7, JDK8 and new major releases
I understood the plan for avoiding JDK7-specific features in our code, and
your suggestion to add an extra Jenkins job is a great way to guard against
that.  The thing I haven't seen discussed yet is how downstream projects
will continue to consume our built artifacts.  If a downstream project
upgrades to pick up a bug fix, and the jar switches to 1.7 class files, but
their project is still building with 1.6, then it would be a nasty surprise.

These are the options I see:

1. Make sure all other projects upgrade first.  This doesn't sound
feasible, unless all other ecosystem projects have moved to JDK7 already.
 If not, then waiting on a single long pole project would hold up our
migration indefinitely.

2. We switch to JDK7, but run javac with -target 1.6 until the whole
ecosystem upgrades.  I find this undesirable, because in a certain sense,
it still leaves a bit of 1.6 lingering in the project.  (I'll assume that
end-of-life for JDK6 also means end-of-life for the 1.6 bytecode format.)

3. Just declare a clean break on some version (your earlier email said 2.5)
and start publishing artifacts built with JDK7 and no -target option.
 Overall, this is my preferred option.  However, as a side effect, this
sets us up for longer-term maintenance and patch releases off of the 2.4
branch if a downstream project that's still on 1.6 needs to pick up a
critical bug fix.

Of course, this is all a moot point if all the downstream ecosystem
projects have already made the switch to JDK7.  I don't know the status of
that off the top of my head.  Maybe someone else out there knows?  If not,
then I expect I can free up enough in a few weeks to volunteer for tracking
down that information.

Chris Nauroth

On Wed, Jun 25, 2014 at 3:12 PM, Alejandro Abdelnur <[EMAIL PROTECTED]>
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