Spring 4.0 support

https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-7.0-Release-Notes

The interesting part seems to be

https://docs.spring.io/spring-framework/reference/7.0-SNAPSHOT/web/webmvc/mvc-controller/ann-requestmapping.html#mvc-ann-requestmapping-version

The question is how to provide the possible versions, OpenAPI does not support that (yet...)

OAI/sig-lifecycle#6
OAI/sig-moonwalk#82

Is there a setting to generate with Jackson 3 instead of Jackson 2? I see in the commit messages that you are using Spring 7, but I don't see how to generate compatible code.

There is currently no specific Spring Boot 4 code. The Spring 7 stuff is only used in the tests (dependabot pull request).

Still on Spring Boot 3 here. My Spring Boot 4 samples just use jackson 2 so I didn't think about that....

To switch between 2/3 it should provide another option like

options:
  jackson: com.fasterxml.jackson
#  jackson: tools.jackson

or

options:
  jackson: 2
#  jackson: 3

I did the first version for bean-validation , javax vs jakarta but I wonder if I go just for the simpler configuration. May be more user friendly to just switch between 2and 3.

The second options would be simpler. Someone could have a typo in the first option. That first option also implies that if Jackson 4 launches and a package prefix of com.jackson4 that we could just supply that. Using 2 or 3, someone could put 4, but the mapping parser can easily return an error that only 2 and 3 are supported in this version.

Yes, thought so too and I started to implement it like that.

I'm confused now ;-)

Do you have something that does not work?

With Jackson 3 it seems that it is still using the annotations in the com.fasterxml.jackson.annotation namespace. This means, at least for now, it should just work out of the box ....

For Jackson 3, they changed the package from com.fasterxml.jackson to tools.jackson. https://cowtowncoder.medium.com/jackson-3-0-0-ga-released-1f669cda529a

So if you upgrade to Spring Boot 4 and don't change the config back to using Jackson 2, none of the generated code compiles. The only workaround is to downgrade back to Jackson 2.

https://github.com/FasterXML/jackson/blob/main/jackson3/MIGRATING_TO_JACKSON_3.md#2-new-maven-group-id-and-java-package

This states that the annotation package does not change.

And annotation is the only package the processor adds to the generated code... if i didn't miss anything :-)

Oh, that's actually good news - I must have been missing a maven dependency during the trial upgrade. Will try again.

Ok, I can confirm, I was able to upgrade an app using openapi-processor to Spring Boot 4.0.4 without issue. I guess the title for this issue can be more specifically about the API Versioning you mentioned.

The other minor thing I see is that the generated code in the spring folder use deprecated annotations, causing compiler warnings.

Can you tell me which one? Taking a quick look at the output of the samples I don't see any.

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Spring 4.0 support #283

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tedberg commented on Mar 3, 2026

hauner commented on Mar 4, 2026

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hauner commented on May 10, 2026

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