Based on feedback, I think that going Java 8 should indeed be signalled
with major version upgrade.
But unlike with 1.x -> 2.x, I think this can and should be done without
changing Maven/Java-package coordinates. This would allow behavior similar
to minor-version update for users who are already on Java 8 (which I
suspect is vast majority); but signal other users that there is something
of _potential_ compatibility problem.
Now: from that point, we have two choices wrt API changes:
1. Consider 2.9 -> 3.0 a minor change, and keep even @deprecated public API
(internal, non-public api is not guaranteed to stay with minor releases,
but we try to give at least one minor version grace-period for those)
2. Take the opportunity to do little more changes. Most likely:
- Remove deprecated (at least by 2.8) public methods -- there are some
that date back to 2.0, esp. in `JsonFactory`
- Change some of the defaults. For example:
o Seems like majority of users prefer `FAIL_ON_UNKNOWN_PROPERTIES`
to be `false` (1.x and 2.x have it as `true`)
- Make minor changes to public API that really make sense (that is,
similar to bug fix) but that are not binary or source compatible; mostly to
Tree Model (JsonNode):
o Existing `void` methods that ought to be chainable; add `this`
return type
o Existing methods that do not declare exceptions but should: some
JsonNode methods
My personal leanings would be towards (2), with some or all of proposed
changes; but I do not assume all users agree. Resulting breakage is nasty
if you are hit by it; especially so for transitive dependencies.
Now: if and when 2.9 will proceed with Java 7, no changes would be made
until end of the year (that is, at earliest january 2017 for master). But I
would create a Wiki page to collect plans for changes to make, so that for
once these may be discussed a priori. I also plan to send update summaries
when significant changes/additions are made.
Thoughts?
-+ Tatu +-
ps. Anyone with insight on Android's Java 8 plans would be very welcome to
share those.
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