Add Jackson 3 support #933

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1. Camsteack commented on Dec 29, 2025

   

   Camsteack

   on Dec 29, 2025

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   Hi ! Is there any plan to add support for Jackson 3 ? This is blocking our upgrade at the moment :)
2. komamitsu commented on Dec 30, 2025

   

   komamitsu

   on Dec 30, 2025

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   Thanks for the request. Unfortunately, I’m not planning to add Jackson 3 support at this time.

   Jackson 3 changed its package names from com.fasterxml.jackson.* to tools.jackson.*. As a result, supporting both Jackson 2 and 3 requires us to duplicate the entire implementation and maintaining two parallel code paths. In addition, Jackson 3 requires Java 17 or later, while msgpack-java currently supports Java 8.

   Jackson 2.18 is an LTS release and will continue to be maintained alongside Jackson 3, so it remains a viable and supported option for users of this project.

   I’ll keep this issue open to track interest, but at the moment the maintenance cost outweighs the benefits.

   Regarding the upgrade concern: since Jackson 3 uses a different package prefix from Jackson 2, it is technically possible to use both Jackson 2 and Jackson 3 in the same library or application without conflicts. Even if jackson-dataformat-msgpack depends on Jackson 2, that should not inherently block adopting Jackson 3 elsewhere.
3. prdoyle commented on Jan 1, 2026

   

   prdoyle

   on Jan 1, 2026

   Last edited by prdoyle

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   Have you considered the tip-and-tail model suggested by the JDK folks? Move to the latest of everything on the main branch, and maintain a "tail branch" with only bug fixes for older Java/Jackson versions?

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4. magicprinc commented on Apr 19, 2026

   

   magicprinc

   on Apr 19, 2026

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   Spring Boot 3 is EOL JUL 2026!😱

   Spring Boot 4 uses Jackson 3 by default.

   So it's time to move to Jackson 3 🙏

   👍React with 👍3Reacted by gonkon, Daniil Koshkin and Sergiy Morenets

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5. komamitsu commented on Apr 21, 2026

   

   komamitsu

   on Apr 21, 2026

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   I am currently busy with Wormhole4j. I will look into this issue after the new version of Wormhole4j is released.

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6. komamitsu commented on Sep 28, 2026

   

   komamitsu

   on Sep 28, 2026

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   @dpishchukhin @Camsteack @prdoyle @magicprinc Jackson 3 support is now available as a separate library: komamitsu/jackson-dataformat-msgpack. Version 3.0.0 is on Maven Central.

   <dependency>
     <groupId>org.komamitsu</groupId>
     <artifactId>jackson-dataformat-msgpack</artifactId>
     <version>3.0.0</version>
   </dependency>

   It requires Java 17+ and Jackson 3.x. Basic usage is the same as with msgpack-jackson:

   ObjectMapper mapper = new MessagePackMapper();

   It is a rewrite rather than a port of msgpack-jackson. It encodes and decodes MessagePack directly on Jackson's own buffers instead of going through msgpack-core, so it has no dependency on msgpack-core. In our benchmarks this made writes about 66% faster and reads about 17% faster on the same POJO.

   It is not a drop-in replacement, so please note the following when migrating:

   • The group ID is org.komamitsu and the package is org.komamitsu.jackson.dataformat.msgpack.
   • MessagePackKeySerializer and MessagePackSerializedString are removed. A map key that the mapper couldn't read back is refused on write.
   • A UUID is written as its 36-character string.
   • A float32 value is read back as a Float.

   msgpack-jackson in this repository stays on Jackson 2 and Java 8, as before.

   Please report problems with the Jackson 3 version on that repository's issue tracker. I'll close this issue, since the request is covered there.

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7. komamitsu

   closed this as completedon Sep 28, 2026