Jackson Version 2.19 development is on-going in April, 2025.

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).

Branch is under development.

No release yet

Two new datatype modules added in jackson-datatypes-misc:

• jackson-datatype-javax-money: support for basic Java Money (JSR-354) datatypes
• jackson-datatype-moneta: support for extended Java Money datatypes JSR-354 RI, Moneta offers

Same as Jackson 2.18, SDK 26

Same as Jackson 2.18 -- mostly Java 8

• 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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• #1467: Support @JsonUnwrapped with @JsonCreator

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• #280: Minor change to module-info.java: use "open module"
• #281: [gradle-module-metadata-maven-plugin] update to version 1.0
• #284: Add OptBoolean valued @JsonProperty.isRequired to (eventually) replace @JsonProperty.required

• #633: Allow skipping RS CTRL-CHAR to support JSON Text Sequences
• #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
• #1394: Wrong/misleading error for "extra" close token (] or }) when at root level
• #1409: [gradle-module-metadata-maven-plugin] update to version 1.0

• #1467: Support @JsonUnwrapped with @JsonCreator
• #2145: Add JsonNode.optional(String name) and optional(int index) methods
• #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
• #4388: Allow using @JsonPropertyOrder with "any" (@JsonAnyGetter) properties
• #4650: PrimitiveArrayDeserializers should deal with single String value if DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY enabled
• #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
• #4771: QName (de)serialization ignores prefix
• #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
• #4801: Add JsonNodeFeature.USE_BIG_DECIMAL_FOR_FLOATS to allow overriding DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS
• #4849: Not able to deserialize Enum with default typing after upgrading 2.15.4 -> 2.17.1
• #4863: Add basic Stream support in JsonNode: valueStream(), entryStream(), forEachEntry()
• #4867: Add Optional<JsonNode> JsonNode.asOptional() convenience method
• #4896: Coercion shouldn't be necessary for Enums specifying an empty string
• #4915: Cannot access attributes from Converter
• #4934: DeserializationContext.readTreeAsValue() handles null nodes differently from ObjectMapper.treeToValue()
• #4938: Allow @JsonCreator annotated Creator to return null
• #4953: Allow clearing all caches to avoid classloader leaks
• #4955: Add more remove methods for ArrayNode, ObjectNode [STEP-3]
• #4959: Add explicit deserializer for ThreadGroup
• #4961: Serialization for JsonFormat.Shape.ARRAY does not work when there is @JsonAnyGetter
• #4963: Serializing Map.Entry as Bean with @JsonFormat.shape = Shape.OBJECT fails on JDK 17+
• #4979: Allow default enums with @JsonCreator
• #4997: ObjectNode put methods should do null check for key
• #5006: Add MapperFeature.REQUIRE_HANDLERS_FOR_JAVA8_OPTIONALS to prevent failure of java.util.Optional (de)serialization without Java 8 module
• #5014: Add java.lang.Runnable as unsafe base type in DefaultBaseTypeLimitingValidator
• #5020: Support new @JsonProperty.isRequired for overridable definition of "required-ness"
• #5027: Add DeserializationFeature.FAIL_ON_SUBTYPE_CLASS_NOT_REGISTERED
• #5052: Minor bug in FirstCharBasedValidator.forFirstNameRule(): returns null in non-default case
• #5069: Add copy-constructor for MappingIterator

• #308: Incorrect serialization for LogicalType.Decimal (Java BigDecimal)
• #388: @JsonEnumDefaultValue not supported when using AvroMapper to generate schema from Java class
• #422: Avro generation failed with enums containing values with special characters
• #535: AvroSchemaGenerator: logicalType(s) never set for non-date classes
• #536: Add Logical Type support for java.util.UUID

• #31: Header names seem to be trimmed (add CsvParser.Feature.TRIM_HEADER_SPACES))
• #554: Enforce, document thread-safety of CsvSchema

• #300: Floats are encoded with sign extension while doubles without

• #502: Add an optional extended parser subclass (YAMLAnchorReplayingFactory) able to inline anchors
• #537: Snakeyaml 2.4

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

• #336: Optimize InstantDeserializer addInColonToOffsetIfMissing()
• #337: Negative Duration does not round-trip properly with WRITE_DURATIONS_AS_TIMESTAMPS enabled
• #342: Lenient deserialization of LocalDate, LocalDateTime is not time-zone aware
• #364: Deserialization of Month in ONE_BASED_MONTHS mode fails for value "12"

• #285: JacksonBlackbirdAccess Class access exception with Groovy Script serialization using BlackbirdModule
• #290: Update Paranamer dep from 2.8 to 2.8.3

• #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.

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

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

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