Jackson 3 migration guide for BasicPolymorphicTypeValidator

[wgroeneveld]

Hi all,

We are working towards making our async background job processor library compatible with Jackson 3 (see jobrunr/jobrunr#1415) and encountered more than a few problems-no wait, challenges-during the process.

The biggest problem we had is the lack of proper documentation: the migration guide did not cover our specific quirks. For example, we relied on LaissezFaireSubTypeValidator that suddenly became inaccessible (not covered in the guide) so I had to learn how to use the BasicPolymorphicTypeValidator.builder() (also not there?)

Do you folks accept a PR to help improve said guide?
Thanks!

Cheers,
Wouter

[pjfanning]

PRs for https://github.com/FasterXML/jackson/blob/main/jackson3/MIGRATING_TO_JACKSON_3.md are much appreciated

[wgroeneveld]

Super! I took a stab, feedback welcome #317

[cowtowncoder]

Thank you @wgroeneveld -- these were indeed gaps in the migration guide. And probably something many users will encounter, so you are saving everyone a lots of time and effort.