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Jackson Release 2.21

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Tatu Saloranta edited this page Nov 4, 2025 · 24 revisions

Jackson Version 2.21 is being developed, as of September 2025.

This wiki page gives a list of links to all changes (with brief descriptions) that will eventually be included, as well as about original plans for bigger changes (and in some cases changes to plans, postponing).

Status

Version is under development (under branch 2.x).

It will likely be designated a Long-Term-Support (LTS) version once 2.21.0 is released.

Patches

No release yet.

Documentation

Articles, Blog posts

New Modules

Changes, compatibility

Android

Same as Jackson 2.20, SDK 26

JDK

Same as Jackson 2.20; mostly Java 8, with some modules requiring later JDKs:

  • jackson-datatype-hibernate: JDK 11 for some modules
  • jackson-jakarta-providers: JDK 11

Kotlin

Same as Jackson 2.20?

Compatibility: datatype modules

Changes, behavior

None

Major focus area(s)

Most wanted Features implemented

Full Change list

Changes, core

Annotations

  • #314: Add JsonInclude.Value convenience constants
  • #316: Make JsonFormat.Features java.io.Serializable

Streaming

  • #363: UTF-8 decoding should fail on Surrogate characters (0xD800 - 0xDFFF)
  • #708: FilteringParserDelegate cannot deserialize empty list
  • #1180: JsonLocation off for unrecognized tokens
  • #1470: Add method copyCurrentStructureExact() to JsonGenerator
  • #1477: Add JsonGenerator.has(StreamWriteCapability) convenience method
  • #1500: Add checks for surrogate pairing for UTF-8 generation

Databind

  • #1547: Un-deprecate SerializationFeature.WRITE_EMPTY_JSON_ARRAYS
  • #5045: If there is a no-parameter constructor marked as JsonCreator and a constructor reported as DefaultCreator, latter is incorrectly used
  • #5293: Fix minor typo in PropertyBindingException.getMessageSuffix()
  • #5313: Expose getConverter() in StdDelegatingSerializer for improved customizability

Changes, data formats

Avro

  • #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0

CBOR

  • #599: Unable to deserialize stringref-enabled CBOR with ignored properties
  • #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0

Ion

  • #623: (ion) Upgrade ion-java dep to 1.11.11 (from 1.11.10)
  • #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0

Protobuf

  • #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0

Smile

  • #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0

XML

  • #114: XmlMapper does not support StreamReadFeature.STRICT_DUPLICATE_DETECTION

Changes, data types

Eclipse Collections

  • #198: Add support for MutableSortedMap/ImmutableSortedMap deserialization

Guava

  • #195: Add support for RangeMap class

Changes, other

Jackson-jr

  • #176: Cannot Deserialize JSON with @JsonProperty-annotated Record fields
  • #208: Support reading of double[]
  • #210: Support reading boolean[]/short[]/float[] values
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