feat: introduce `JavalinJackson3` as an optional `JsonMapper` implementation for Jackson 3 by yvasyliev · Pull Request #2548 · javalin/javalin

yvasyliev · 2026-03-04T10:25:05Z

Note

Update: the PR is ready for review.

This pull request introduces support for Jackson 3 as a new JSON mapper in the Javalin framework, alongside the existing Jackson 2 integration. The main changes add the JavalinJackson3 implementation, update dependency management to include Jackson 3 modules, and provide thorough testing for the new mapper. These updates allow users to leverage the latest Jackson features and improve JSON handling flexibility.

The implementation is inspired by JavalinJackson.

Changelist

Introduced Jackson 3 optional dependencies to the project.
- com.fasterxml.jackson.datatype:jackson-datatype-eclipse-collections was never declared as optional dependency in the project, so neither was tools.jackson.datatype:jackson-datatype-eclipse-collections.
Added new JavalinJackson3 class implementing JsonMapper for Jackson 3 support.
JACKSON3, JACKSON3_KT and JACKSON3_ECLIPSE_COLLECTIONS constants were added to CoreDependency.
- org.ktorm:ktorm-jackson hasn't got any releases for years, and there's no Jackson 3 support, so JACKSON3_KTORM constant was omitted.
JavalinJackson3 was covered with unit tests via TestJavalinJackson3.

The build and tests passed locally. I managed to successfully verify the change by including the artifact into the other project.

…ackson 3 mapper

tipsy · 2026-03-04T11:53:51Z

This PR is in progress. Please do not merge it.

I'll hold the review, but please note that we just published 7x, and we cannot change the default Jackson mapper until 8x.

We can introduce JavalinJackson3 and let users register it through config.jsonMapper(JavalinJackson3()), but it must be a purely additive change.

codecov · 2026-03-06T08:01:38Z

Codecov Report

❌ Patch coverage is 97.72727% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.37%. Comparing base (962e215) to head (6d7bd78).
⚠️ Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/src/main/java/io/javalin/json/JavalinJackson3.kt	97.56%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2548      +/-   ##
============================================
+ Coverage     86.29%   86.37%   +0.08%     
- Complexity     1509     1526      +17     
============================================
  Files           155      156       +1     
  Lines          4348     4403      +55     
  Branches        523      530       +7     
============================================
+ Hits           3752     3803      +51     
- Misses          363      366       +3     
- Partials        233      234       +1

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…ackson3

yvasyliev · 2026-03-07T18:09:24Z

Hey @tipsy thanks for the prompt reply!

I made this PR keep Jackson 2 the default JSON mapper.

PR description is updated. The PR is ready for review.

Thanks!

vorburger · 2026-03-10T19:33:38Z

We can introduce JavalinJackson3 and let users register it through config.jsonMapper(JavalinJackson3()), but it must be a purely additive change.

@tipsy just a quick "user adoption" feedback, in case that's a useful datapoint: I just wrote (ctrl-w had AI write me...) my very own JavalinJackson3... then thought "hey wait maybe this already exists" - and found this PR! (Thank You @yvasyliev) Just wanted to let you know that while sticking with backwards compability is understandable and makes perfect sense, there are at least 2 users out there in wild who would use this whenever this will be released.

vorburger · 2026-03-10T20:29:04Z

... my very own JavalinJackson3 ... who would use this whenever this will be released

Actually, this wouldn't quite work as-is for me, perhaps this feedback interests (both of) you:

When configured with this (as-is), Javalin can't handle Jackson 2 annotated types anymore, e.g. com.fasterxml.jackson.databind.annotation.JsonDeserialize. In "pure" Jackson 3 only projects, that's fine. But in projects with existing types that haven't migrated to Jackson 3 annotations only yet it wouldn't work, perhaps because they depend on external libraries (yes, I'm looking at you, googleapis/java-genai#868, for example). In my project's own JavalinJackson3 I'm handling this by still supporting both (by neccessity, not choice.)

This PR should probably still be merged as-is for a Jackson 3 only as initial version. But Javalin would need something that can offer both Jackson 2 and Jackson 3, possibly for a while. I suspect that could be implemented as a JavalinJackson23 (?) which wraps and delegates to either JavalinJackson2 or JavalinJackson3. I could contribute that, if there is interest, after this has been merged.

tipsy · 2026-03-12T20:53:46Z

augment review

augmentcode · 2026-03-12T20:57:52Z

🤖 Augment PR Summary

Summary: Adds an opt-in Jackson 3 JSON mapper implementation for Javalin without changing the existing default (Jackson 2).

Changes:

Introduces JavalinJackson3 implementing JsonMapper on top of Jackson 3’s tools.jackson.databind.json.JsonMapper
Adds Jackson 3 optional dependency metadata via new CoreDependency.JACKSON3* constants
Updates JPMS module-info.java with requires static entries for Jackson 3 modules
Extends Maven dependency management by importing the Jackson 3 BOM and adds optional Jackson 3 dependencies in the javalin module
Adds a dedicated TestJavalinJackson3 suite covering streaming, (de)serialization, and missing-dependency behavior

Technical Notes: The change is additive/opt-in (users must explicitly configure config.jsonMapper(JavalinJackson3())) and keeps existing Jackson 2 behavior intact.

_{🤖 Was this summary useful? React with 👍 or 👎}

augmentcode

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

yvasyliev · 2026-03-13T10:12:43Z

Please review again

tipsy · 2026-03-13T14:06:32Z

augment review

augmentcode

Review completed. 3 suggestions posted.

Comment augment review to trigger a new review at any time.

…check

yvasyliev · 2026-03-19T08:33:42Z

I resolved the review comments. If possible, please review again 🙏

tipsy · 2026-03-19T11:45:25Z

augment review

augmentcode

Review completed. 1 suggestion posted.

Comment augment review to trigger a new review at any time.

…r test for JavalinJackson3

tipsy · 2026-03-19T19:34:21Z

@yvasyliev I can do a human review in the weekend :)

tipsy · 2026-03-22T14:35:59Z

Thanks @yvasyliev, merged !

Bumps `javalin.version` from 7.1.0 to 7.2.0. Updates `io.javalin:javalin-bundle` from 7.1.0 to 7.2.0 Release notes *Sourced from [io.javalin:javalin-bundle's releases](https://github.com/javalin/javalin/releases).* > 7.2.0 > ----- > > What's Changed > -------------- > > * [performance] Replace Stream API with List and reduce per-request allocations by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2567](https://redirect.github.com/javalin/javalin/pull/2567) > * feat: introduce `JavalinJackson3` as an optional `JsonMapper` implementation for Jackson 3 by [`@yvasyliev`](https://github.com/yvasyliev) in [javalin/javalin#2548](https://redirect.github.com/javalin/javalin/pull/2548) > * [workflow]: Bump codecov/codecov-action from 5.5.2 to 5.5.3 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2569](https://redirect.github.com/javalin/javalin/pull/2569) > * Add path role inheritance by [`@AoElite`](https://github.com/AoElite) in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [deps]: Bump the dependencies group across 1 directory with 23 updates by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2575](https://redirect.github.com/javalin/javalin/pull/2575) > * [workflow]: Bump codecov/codecov-action from 5.5.3 to 6.0.0 in the dependencies group across 1 directory by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2570](https://redirect.github.com/javalin/javalin/pull/2570) > * [workflow]: Bump actions/github-script from 8 to 9 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2581](https://redirect.github.com/javalin/javalin/pull/2581) > * [cleanup] Remove JavalinTest.class by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [deps] Bump Jetty from 12.1.7 to 12.1.8 by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2585](https://redirect.github.com/javalin/javalin/pull/2585) > * Add ability to emit plain data messages in SSE by [`@1cg`](https://github.com/1cg) in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * fix: sanitize newlines in SSE event and id fields by [`@eddieran`](https://github.com/eddieran) in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > * [deps] Bump stable deps and sync OptionalDependency.kt by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2588](https://redirect.github.com/javalin/javalin/pull/2588) > > New Contributors > ---------------- > > * [`@AoElite`](https://github.com/AoElite) made their first contribution in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [`@vorburger`](https://github.com/vorburger) made their first contribution in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [`@1cg`](https://github.com/1cg) made their first contribution in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * [`@eddieran`](https://github.com/eddieran) made their first contribution in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > > **Full Changelog**: <javalin/javalin@javalin-parent-7.1.0...javalin-parent-7.2.0> Commits * [`c67b118`](javalin/javalin@c67b118) [maven-release-plugin] prepare release javalin-parent-7.2.0 * [`b89fdf7`](javalin/javalin@b89fdf7) [deps] Bump stable deps and sync OptionalDependency.kt ([#2588](https://redirect.github.com/javalin/javalin/issues/2588)) * [`a3ad657`](javalin/javalin@a3ad657) [sse] Sanitize newlines in event and id fields * [`e0f5458`](javalin/javalin@e0f5458) [sse] Add ability to emit plain data messages * [`fa51869`](javalin/javalin@fa51869) [deps] Bump Jetty from 12.1.7 to 12.1.8 ([#2585](https://redirect.github.com/javalin/javalin/issues/2585)) * [`4bc70e9`](javalin/javalin@4bc70e9) [cleanup] Remove JavalinTest.class ([#2584](https://redirect.github.com/javalin/javalin/issues/2584)) * [`1901feb`](javalin/javalin@1901feb) [workflow]: Bump actions/github-script in the dependencies group ([#2581](https://redirect.github.com/javalin/javalin/issues/2581)) * [`152f7b3`](javalin/javalin@152f7b3) [workflow]: Bump codecov/codecov-action in the dependencies group ([#2570](https://redirect.github.com/javalin/javalin/issues/2570)) * [`2c4d1ef`](javalin/javalin@2c4d1ef) [deps]: Bump the dependencies group across 1 directory with 23 updates ([#2575](https://redirect.github.com/javalin/javalin/issues/2575)) * [`64f3a75`](javalin/javalin@64f3a75) [apibuilder] Refactor role-scoping internals to Kotlin * Additional commits viewable in [compare view](javalin/javalin@7.1.0...javalin-parent-7.2.0) Updates `io.javalin.community.openapi:javalin-openapi-plugin` from 7.1.0 to 7.2.0 Release notes *Sourced from [io.javalin.community.openapi:javalin-openapi-plugin's releases](https://github.com/javalin/javalin-openapi/releases).* > 7.2.0 > ----- > > **Changes** > > * Bumped Javalin to 7.2.0 > > **Sponsors** > Thanks to everyone who supported me this month 💜 > > **Minimal requirements** > > * Java 17+ / Kotlin 2.3+ > * Javalin 7.2.0 > > 7.1.1-rc.1 > ---------- > > **Changes** > > * [javalin/javalin-openapi#275](https://redirect.github.com/javalin/javalin-openapi/issues/275) [Make ClassLoader used for loading resources configurable](javalin/javalin-openapi@de1b6b7) > > **Sponsors** > Thanks to everyone who supported me this month 💜 ... (truncated) Commits * [`123e727`](javalin/javalin-openapi@123e727) [GH-279](https://redirect.github.com/javalin/javalin-openapi/issues/279) Adjust to Javalin's breaking changed in InternalRouter * [`3ea0e98`](javalin/javalin-openapi@3ea0e98) [GH-279](https://redirect.github.com/javalin/javalin-openapi/issues/279) Release 7.2.0 (Resolves [#279](https://redirect.github.com/javalin/javalin-openapi/issues/279)) * [`0471f8a`](javalin/javalin-openapi@0471f8a) [GH-277](https://redirect.github.com/javalin/javalin-openapi/issues/277) Release 7.1.1-rc.2 * [`3831f78`](javalin/javalin-openapi@3831f78) [GH-277](https://redirect.github.com/javalin/javalin-openapi/issues/277) Cover handling of complex types in query parameters (Resolves [#277](https://redirect.github.com/javalin/javalin-openapi/issues/277)) * See full diff in [compare view](javalin/javalin-openapi@7.1.0...7.2.0) Updates `io.javalin.community.openapi:javalin-swagger-plugin` from 7.1.0 to 7.2.0 Release notes *Sourced from [io.javalin.community.openapi:javalin-swagger-plugin's releases](https://github.com/javalin/javalin-openapi/releases).* > 7.2.0 > ----- > > **Changes** > > * Bumped Javalin to 7.2.0 > > **Sponsors** > Thanks to everyone who supported me this month 💜 > > **Minimal requirements** > > * Java 17+ / Kotlin 2.3+ > * Javalin 7.2.0 > > 7.1.1-rc.1 > ---------- > > **Changes** > > * [javalin/javalin-openapi#275](https://redirect.github.com/javalin/javalin-openapi/issues/275) [Make ClassLoader used for loading resources configurable](javalin/javalin-openapi@de1b6b7) > > **Sponsors** > Thanks to everyone who supported me this month 💜 ... (truncated) Commits * [`123e727`](javalin/javalin-openapi@123e727) [GH-279](https://redirect.github.com/javalin/javalin-openapi/issues/279) Adjust to Javalin's breaking changed in InternalRouter * [`3ea0e98`](javalin/javalin-openapi@3ea0e98) [GH-279](https://redirect.github.com/javalin/javalin-openapi/issues/279) Release 7.2.0 (Resolves [#279](https://redirect.github.com/javalin/javalin-openapi/issues/279)) * [`0471f8a`](javalin/javalin-openapi@0471f8a) [GH-277](https://redirect.github.com/javalin/javalin-openapi/issues/277) Release 7.1.1-rc.2 * [`3831f78`](javalin/javalin-openapi@3831f78) [GH-277](https://redirect.github.com/javalin/javalin-openapi/issues/277) Cover handling of complex types in query parameters (Resolves [#277](https://redirect.github.com/javalin/javalin-openapi/issues/277)) * See full diff in [compare view](javalin/javalin-openapi@7.1.0...7.2.0) Updates `io.javalin:javalin-micrometer` from 7.1.0 to 7.2.0 Release notes *Sourced from [io.javalin:javalin-micrometer's releases](https://github.com/javalin/javalin/releases).* > 7.2.0 > ----- > > What's Changed > -------------- > > * [performance] Replace Stream API with List and reduce per-request allocations by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2567](https://redirect.github.com/javalin/javalin/pull/2567) > * feat: introduce `JavalinJackson3` as an optional `JsonMapper` implementation for Jackson 3 by [`@yvasyliev`](https://github.com/yvasyliev) in [javalin/javalin#2548](https://redirect.github.com/javalin/javalin/pull/2548) > * [workflow]: Bump codecov/codecov-action from 5.5.2 to 5.5.3 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2569](https://redirect.github.com/javalin/javalin/pull/2569) > * Add path role inheritance by [`@AoElite`](https://github.com/AoElite) in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [deps]: Bump the dependencies group across 1 directory with 23 updates by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2575](https://redirect.github.com/javalin/javalin/pull/2575) > * [workflow]: Bump codecov/codecov-action from 5.5.3 to 6.0.0 in the dependencies group across 1 directory by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2570](https://redirect.github.com/javalin/javalin/pull/2570) > * [workflow]: Bump actions/github-script from 8 to 9 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2581](https://redirect.github.com/javalin/javalin/pull/2581) > * [cleanup] Remove JavalinTest.class by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [deps] Bump Jetty from 12.1.7 to 12.1.8 by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2585](https://redirect.github.com/javalin/javalin/pull/2585) > * Add ability to emit plain data messages in SSE by [`@1cg`](https://github.com/1cg) in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * fix: sanitize newlines in SSE event and id fields by [`@eddieran`](https://github.com/eddieran) in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > * [deps] Bump stable deps and sync OptionalDependency.kt by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2588](https://redirect.github.com/javalin/javalin/pull/2588) > > New Contributors > ---------------- > > * [`@AoElite`](https://github.com/AoElite) made their first contribution in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [`@vorburger`](https://github.com/vorburger) made their first contribution in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [`@1cg`](https://github.com/1cg) made their first contribution in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * [`@eddieran`](https://github.com/eddieran) made their first contribution in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > > **Full Changelog**: <javalin/javalin@javalin-parent-7.1.0...javalin-parent-7.2.0> Commits * [`c67b118`](javalin/javalin@c67b118) [maven-release-plugin] prepare release javalin-parent-7.2.0 * [`b89fdf7`](javalin/javalin@b89fdf7) [deps] Bump stable deps and sync OptionalDependency.kt ([#2588](https://redirect.github.com/javalin/javalin/issues/2588)) * [`a3ad657`](javalin/javalin@a3ad657) [sse] Sanitize newlines in event and id fields * [`e0f5458`](javalin/javalin@e0f5458) [sse] Add ability to emit plain data messages * [`fa51869`](javalin/javalin@fa51869) [deps] Bump Jetty from 12.1.7 to 12.1.8 ([#2585](https://redirect.github.com/javalin/javalin/issues/2585)) * [`4bc70e9`](javalin/javalin@4bc70e9) [cleanup] Remove JavalinTest.class ([#2584](https://redirect.github.com/javalin/javalin/issues/2584)) * [`1901feb`](javalin/javalin@1901feb) [workflow]: Bump actions/github-script in the dependencies group ([#2581](https://redirect.github.com/javalin/javalin/issues/2581)) * [`152f7b3`](javalin/javalin@152f7b3) [workflow]: Bump codecov/codecov-action in the dependencies group ([#2570](https://redirect.github.com/javalin/javalin/issues/2570)) * [`2c4d1ef`](javalin/javalin@2c4d1ef) [deps]: Bump the dependencies group across 1 directory with 23 updates ([#2575](https://redirect.github.com/javalin/javalin/issues/2575)) * [`64f3a75`](javalin/javalin@64f3a75) [apibuilder] Refactor role-scoping internals to Kotlin * Additional commits viewable in [compare view](javalin/javalin@7.1.0...javalin-parent-7.2.0) Updates `io.javalin:javalin-testtools` from 7.1.0 to 7.2.0 Release notes *Sourced from [io.javalin:javalin-testtools's releases](https://github.com/javalin/javalin/releases).* > 7.2.0 > ----- > > What's Changed > -------------- > > * [performance] Replace Stream API with List and reduce per-request allocations by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2567](https://redirect.github.com/javalin/javalin/pull/2567) > * feat: introduce `JavalinJackson3` as an optional `JsonMapper` implementation for Jackson 3 by [`@yvasyliev`](https://github.com/yvasyliev) in [javalin/javalin#2548](https://redirect.github.com/javalin/javalin/pull/2548) > * [workflow]: Bump codecov/codecov-action from 5.5.2 to 5.5.3 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2569](https://redirect.github.com/javalin/javalin/pull/2569) > * Add path role inheritance by [`@AoElite`](https://github.com/AoElite) in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [deps]: Bump the dependencies group across 1 directory with 23 updates by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2575](https://redirect.github.com/javalin/javalin/pull/2575) > * [workflow]: Bump codecov/codecov-action from 5.5.3 to 6.0.0 in the dependencies group across 1 directory by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2570](https://redirect.github.com/javalin/javalin/pull/2570) > * [workflow]: Bump actions/github-script from 8 to 9 in the dependencies group by [`@dependabot`](https://github.com/dependabot)[bot] in [javalin/javalin#2581](https://redirect.github.com/javalin/javalin/pull/2581) > * [cleanup] Remove JavalinTest.class by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [deps] Bump Jetty from 12.1.7 to 12.1.8 by [`@vorburger`](https://github.com/vorburger) in [javalin/javalin#2585](https://redirect.github.com/javalin/javalin/pull/2585) > * Add ability to emit plain data messages in SSE by [`@1cg`](https://github.com/1cg) in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * fix: sanitize newlines in SSE event and id fields by [`@eddieran`](https://github.com/eddieran) in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > * [deps] Bump stable deps and sync OptionalDependency.kt by [`@tipsy`](https://github.com/tipsy) in [javalin/javalin#2588](https://redirect.github.com/javalin/javalin/pull/2588) > > New Contributors > ---------------- > > * [`@AoElite`](https://github.com/AoElite) made their first contribution in [javalin/javalin#2553](https://redirect.github.com/javalin/javalin/pull/2553) > * [`@vorburger`](https://github.com/vorburger) made their first contribution in [javalin/javalin#2584](https://redirect.github.com/javalin/javalin/pull/2584) > * [`@1cg`](https://github.com/1cg) made their first contribution in [javalin/javalin#2578](https://redirect.github.com/javalin/javalin/pull/2578) > * [`@eddieran`](https://github.com/eddieran) made their first contribution in [javalin/javalin#2580](https://redirect.github.com/javalin/javalin/pull/2580) > > **Full Changelog**: <javalin/javalin@javalin-parent-7.1.0...javalin-parent-7.2.0> Commits * [`c67b118`](javalin/javalin@c67b118) [maven-release-plugin] prepare release javalin-parent-7.2.0 * [`b89fdf7`](javalin/javalin@b89fdf7) [deps] Bump stable deps and sync OptionalDependency.kt ([#2588](https://redirect.github.com/javalin/javalin/issues/2588)) * [`a3ad657`](javalin/javalin@a3ad657) [sse] Sanitize newlines in event and id fields * [`e0f5458`](javalin/javalin@e0f5458) [sse] Add ability to emit plain data messages * [`fa51869`](javalin/javalin@fa51869) [deps] Bump Jetty from 12.1.7 to 12.1.8 ([#2585](https://redirect.github.com/javalin/javalin/issues/2585)) * [`4bc70e9`](javalin/javalin@4bc70e9) [cleanup] Remove JavalinTest.class ([#2584](https://redirect.github.com/javalin/javalin/issues/2584)) * [`1901feb`](javalin/javalin@1901feb) [workflow]: Bump actions/github-script in the dependencies group ([#2581](https://redirect.github.com/javalin/javalin/issues/2581)) * [`152f7b3`](javalin/javalin@152f7b3) [workflow]: Bump codecov/codecov-action in the dependencies group ([#2570](https://redirect.github.com/javalin/javalin/issues/2570)) * [`2c4d1ef`](javalin/javalin@2c4d1ef) [deps]: Bump the dependencies group across 1 directory with 23 updates ([#2575](https://redirect.github.com/javalin/javalin/issues/2575)) * [`64f3a75`](javalin/javalin@64f3a75) [apibuilder] Refactor role-scoping internals to Kotlin * Additional commits viewable in [compare view](javalin/javalin@7.1.0...javalin-parent-7.2.0)

yvasyliev added 3 commits March 3, 2026 11:45

feat: add Jackson 3 dependencies

87284f8

feat: create JavalinJackson3

d09027b

feat: enable Jackson 2 enabled-by-default serialization features in J…

cc7f46f

…ackson 3 mapper

yvasyliev changed the title ~~Feature/jackson3~~ feature: make Jackson 3 a default JSON mapper Mar 4, 2026

yvasyliev mentioned this pull request Mar 4, 2026

💡 Feature Request: introduce Jackson 3-compatible io.javalin.json.JavalinJackson implementation #2526

Closed

chore: remove ObjectMapper references

3defe4e

yvasyliev added 3 commits March 5, 2026 10:43

fix: disable AUTO_CLOSE_TARGET

5882758

feat: make JavalinJackson a default JSON mapper adaptor

6ff00d9

Merge branch 'master' into feature/jackson3

d7903b7

yvasyliev added 2 commits March 7, 2026 19:44

feat(test): cover the case when Jackson 3 is not on classpath

d1a6000

Merge remote-tracking branch 'origin/feature/jackson3' into feature/j…

d74d7f0

…ackson3

yvasyliev changed the title ~~feature: make Jackson 3 a default JSON mapper~~ feature: introduce JavalinJackson3 as an optional JsonMapper implementation for Jackson 3 Mar 7, 2026

yvasyliev marked this pull request as ready for review March 7, 2026 18:04

chore: apply formatting

8421bfe

yvasyliev changed the title ~~feature: introduce JavalinJackson3 as an optional JsonMapper implementation for Jackson 3~~ feat: introduce JavalinJackson3 as an optional JsonMapper implementation for Jackson 3 Mar 11, 2026

augmentcode Bot reviewed Mar 12, 2026

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Comment thread javalin/pom.xml Outdated

Comment thread javalin/src/test/java/io/javalin/TestJavalinJackson3.kt Outdated

chore: remove unused Jackson core dependency from pom.xml

537d12e

augmentcode Bot reviewed Mar 13, 2026

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Comment thread javalin/src/main/java/io/javalin/json/JavalinJackson3.kt

Comment thread javalin/pom.xml

Comment thread javalin/src/test/java/io/javalin/TestJavalinJackson3.kt

yvasyliev added 2 commits March 14, 2026 15:27

feat: add Jackson 3 dependencies and update test for class existence …

a19d89b

…check

feat: mark jackson-databind dependency as optional in pom.xml

25ce226

tipsy force-pushed the master branch from 06e2972 to b661c76 Compare March 18, 2026 12:54

tipsy force-pushed the master branch from b661c76 to 338c402 Compare March 18, 2026 13:20

augmentcode Bot reviewed Mar 19, 2026

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Comment thread javalin/src/test/java/io/javalin/TestJavalinJackson3.kt Outdated

yvasyliev added 2 commits March 19, 2026 17:34

feat: update JavalinJackson3 to use custom JsonMapper with Kotlin module

f59abdc

feat: update tests to use default JsonMapper and add custom JsonMappe…

6d7bd78

…r test for JavalinJackson3

tipsy merged commit edfb887 into javalin:master Mar 22, 2026
9 checks passed

yvasyliev deleted the feature/jackson3 branch March 22, 2026 16:28

vorburger mentioned this pull request Mar 30, 2026

JavalinJackson23 bridge to JavalinJackson (v2) or JavalinJackson3 #2571

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