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).

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.

No release yet.

Same as Jackson 2.20, SDK 26

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

Same as Jackson 2.20?

None

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• #314: Add JsonInclude.Value convenience constants
• #316: Make JsonFormat.Features java.io.Serializable
• #320: Add radix property to @JsonFormat annotation

• #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

• #1381: Add a way to specify "inject-only" with @JacksonInject
• #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
• #5203: Fix null handling of EnumSetDeserializer
• #5293: Fix minor typo in PropertyBindingException.getMessageSuffix()
• #5313: Expose getConverter() in StdDelegatingSerializer for improved customizability

• #628: Uncommon parent pom dependency configuration in Jackson 2.20/3.0
• Upgrade avro lib dep to 1.11.5 (from 1.11.4)

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

• #10: Missing null writes when writing Object[] values

• #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

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

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

• #114: XmlMapper does not support StreamReadFeature.STRICT_DUPLICATE_DETECTION

• #154: YAML file with no content throws MismatchedInputException when binding to Object type (POJO etc)

• #198: Add support for MutableSortedMap/ImmutableSortedMap deserialization

• #195: Add support for RangeMap class

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