Jackson 3.1.0-rc1 released, testing feedback much appreciated

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Tatu Saloranta

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Feb 7, 2026, 3:51:03 PM (12 days ago) Feb 7
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Quick note: the first -- and I hope, only -- release candidate for 3.1
is now out.
With almost 100 changes (mostly fixes, but also 4 Most Wanted issues tackled):

https://github.com/FasterXML/jackson/wiki/Jackson-Release-3.1

it has TONS of changes. Mostly for good but there's always a higher
chance of regression with more ambitious (and just... MORE) fixes.

There are also some small but important behavioral changes -- listed
under "Changes, Behavior" -- that we want to get in 3.1 to essentially
try to finalize expected behavior for 3.x, addressing issues found in
3.0.0 GA.

Given all of this, now would be a great time to get some feedback
based on testing by users!
As much as I want to get 3.1.0 GA out, I'd also want to take time to
minimize disruption due to uncaught regressions.

So, if you have any bandwidth to test 3.1.0-rc1, help would be very
much appreciated!

-+ Tatu +-

ps. As usual, all kinds of feedback are welcome, even positive :)

Tatu Saloranta

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Feb 17, 2026, 7:33:18 PM (2 days ago) Feb 17
to jacks...@googlegroups.com
So far I have received confirmation that "Spring Framework main branch builds fine against Jackson 3.1.0-rc1." (thank you Sébastien!) but not much more.

Anyone else have a chance to try out 3.1.0-rc1?

I am thinking of cutting the release soon now, this week. So last call for bug reports! :)

-+ Tatu +-
 

-+ Tatu +-

ps. As usual, all kinds of feedback are welcome, even positive :)

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