Jackson Release 2.19

Jackson Version 2.19 development is being started in September, 2024.

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

Status

Branch is under development.

Patches

No release yet

Documentation

Articles, Blog posts

Changes, compatibility

Compatibility: platform requirements

Android

Same as Jackson 2.18, SDK 26

JDK

Same as Jackson 2.18

Kotlin

Changes, behavior

JsonPointer

• Handling of "orphan" tildes (~ not part of ~0 or ~1 escape sequence) changed:
  • #1361: JsonPointer parsing of '~' not followed by "0" or "1" unexpected
  • NOTE: use of such "orphan" tildes is not (well) covered by JSON Pointer specs so expected handling is not defined.
  • Old behavior used ~ as "general escape", i.e. skipped ~ and included following character
  • New behavior feels more expected: unpaired ~ will simply be included as-is

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Major focus area(s)

Most wanted Features to implement

Most wanted Features implemented

• #1467: Support @JsonUnwrapped with @JsonCreator

Most wanted Features considered but not implemented

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Full Change list

Changes, core

Annotations

• No changes since 2.18

Streaming

• #1328: Optimize handling of JsonPointer.head()
• #1356: Make JsonGenerator::writeTypePrefix method to not write a WRAPPER_ARRAY when typeIdDef.id == null
• #1361: JsonPointer parsing of '~' not followed by "0" or "1" unexpected

Databind

• #1467: Support @JsonUnwrapped with @JsonCreator
• #2461: Nested @JsonUnwrapped property names not correctly handled
• #2951: Allow inverting @JsonProperty(access=) with MapperFeature.INVERSE_READ_WRITE_ACCESS to work differently on server and client side
• #4674: Allow setting global enum naming strategy similar to property naming strategy
• #4676: Support other enum naming strategies than camelCase
• #4680: Custom key deserialiser registered for Object.class in nested Map object is ignored when Map key type not defined
• #4772: Serialization and deserialization issue of sub-types used with JsonTypeInfo.Id.DEDUCTION where sub-types are Object and Array
• #4773: SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS should not apply to Maps with uncomparable keys
• #4773: Not able to deserialize Enum with default typing after upgrading 2.15.4 -> 2.17.1

Changes, data formats

Changes, datatypes

Guava

• #1: Add deserialization support for Table<R, C, V>

Java 8 date/time

• #336: Optimize InstantDeserializer addInColonToOffsetIfMissing()

Changes, Other modules

Changes, JVM Languages

Kotlin

• #835: Remove old SingletonSupport class and unified with KotlinFeature.SingletonSupport.
• #839: Remove useKotlinPropertyNameForGetter and unify with kotlinPropertyNameAsImplicitName.
• #858: Minor performance improvement of findDefaultCreator in edge cases.

Scala

Changes, Providers

JAX-RS Providers

Jakarta-RS Providers

• #36: Narrow types to format specific (e.g. CBORMapper) when resolving via JAX-RS Providers

Changes, other

Jackson-jr

• #171: Add a JSON.Feature.WRITE_RECORD_FIELDS_IN_DECLARATION_ORDER for retaining Serialization order of Java Records (instead of alphabetic)