Jackson Release 2.20

Status

Branch is under development as of May 2025.

Patches

No release yet

Documentation

Articles, Blog posts

Changes, compatibility

Compatibility: platform requirements

Android

Same as Jackson 2.19, SDK 26

JDK

Same as Jackson 2.19 -- mostly Java 8

Kotlin

Same as Jackson 2.19?

Changes, behavior

None

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Major focus area(s)

Most wanted Features to implement

Most wanted Features implemented

Most wanted Features considered but not implemented

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Full Change list

Changes, core

Annotations

• #291: Add optional property for @JacksonInject to allow optionally injected values

Streaming

Databind

• #3072: Allow specifying @JacksonInject does not fail when there's no corresponding value
• #4136: Drop deprecated (in 2.12) PropertyNamingStrategy implementations from 2.20
• #4656: DeserializationProblemHandler.handleUnexpectedToken() cast Object to String
• #5103: Use writeStartObject(Object forValue, int size) for ObjectNode serialization
• #5151: Add new exception type, MissingInjectValueException, to be used for failed @JacksonInject

Changes, data formats

CBOR

• #137: Allow exposing CBOR "undefined" value as JsonToken.VALUE_EMBEDDED_OBJECT (with embedded value of null)
• #431: Negative BigInteger values not encoded/decoded correctly
• #587: Allow exposing CBOR Simple values as JsonToken.VALUE_EMBEDDED_OBJECT with a feature flag

Changes, data types:

Joda

• #92: DateTime serialization result is not same as Java 8 ZonedDateTime
• #146: DateTime can't be serialized with its own zone (WRITE_DATES_WITH_CONTEXT_TIME_ZONE not respected)

Changes, other