When using WebFluxTest, WebTestClient's codecs are not customized breaking JSON (de)serialisation that relies on Module-provided functionality

[mkheck]

Possible bug report/regression:

This code works with v2.0.6.RELEASE & prior versions of Boot, and Jackson dependencies were unchanged between 2.0.6 & 2.1.0.

Unit test fails with this stack trace: https://gist.github.com/mkheck/f94d3a2caea883004fc3442379d3b07d

Sample project is here: https://github.com/mkheck/Boot210JacksonNoCreatorsException

Steps to reproduce: run only active unit test in RouteConfigTest (getAllCoffees()).

[wilkinsona]

I believe this is due to a change in Lombok 1.18 and the annotations it generates by default. If you can reproduce the problem without Lombok, please let us know and we can take another look.

[bclozel]

I’m not on my computer at the moment but it sounds like a Lombok change.
I don’t think @Value generates a noarg constructor by default anymore. See
https://projectlombok.org/changelog for version 1.18.0.

Maybe you need to enable this lombok.noArgsConstructor.extraPrivate property? Or maybe you should ensure that your IDE is compiling Java classes with parameter names symbols?

We should make sure we’ve got this covered in the 2.1 migration guide.

[wilkinsona]

That’s a good point about the migration guide (or release notes for 2.1 I guess), @bclozel.

[mkheck]

Updated the project to be Lombok-less (& updated the repo on GH). Same issue persists.

[mkheck]

Just to follow up on the Lombok @Value topic, here is the last note about it, from their release notes for v1.16.22 "Envious Ferret" (May 29th, 2018):

"FEATURE: Private no-args constructor for @Data and @Value to enable deserialization frameworks (like Jackson) to operate out-of-the-box. Use lombok.noArgsConstructor.extraPrivate = false to disable this behavior."

No notes since contradicting it, even from their 30 October release. :/