Jackson Release 3.4

Jackson Version](Jackson-Releases) 3.4 is under development as of November, 2026.

This wiki page gives a list of links to all changes (with brief descriptions) that will be included.

Version is under development (under branch 3.x).

It will likely be designated as Long-Term-Support (LTS) since 3.1 is the previous LTS.

No release yet.

None

SDK 34 for all components (since Jackson 3.3). Verified by "Animal Sniffer" plug-in.

Same as Jackson 3.3; Java 17, except for:

• JDK 25 for [jackson-module-blackbird]

Minimum supported Kotlin same as Jackson 3.3: 2.2.

No changes.

None.

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Fixes?

None yet

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No separate 3.x versions released, will use jackson-annotations 2.24.

None yet

• #6264: @JsonIgnoreProperties / @JsonIncludeProperties not honored on @JsonAnySetter properties
• #6276: Honor @JsonApplyView for unwrapped and any-getter properties
• #6303: IllegalArgumentException thrown by a setter is reported as a type mismatch ("Problem deserializing property ... expected type ... actual type")
• #6397: @JsonFormat(shape = ARRAY) builder with @JsonCreator silently loses buffered property if builder is immutable
• #6413: Consolidate "effective input names" for @JsonUnwrapped properties (include polymorphic type id) instead of special-casing in UnwrappedPropertyHandler
• #6430: Treat null AnnotationIntrospector as "no introspection" instead of failing with NPE

• #105: Bump org.json:json dependency to latest, 20260814