Jackson Release 2.20

Status

Branch is under development as of May 2025.

Patches

No release yet

Documentation

Articles, Blog posts

New Modules

Hibernate 7 support

New datatype modules added in jackson-datatype-hibernate:

• jackson-datatype-hibernate7

Changes, compatibility

Compatibility: platform requirements

Android

Same as Jackson 2.19, SDK 26

JDK

Same as Jackson 2.19 (mostly Java 8) except:

• jackson-annotations now requires Java 8 (no more Java 6 baseline)

Kotlin

Same as Jackson 2.19?

Compatibility: versioning

• jackson-annotations no longer uses patch number: so we have version 2.20 (instead of 2.19.0 and so on)

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
• #293: Improve duplicate Id with different associated object error message
• #294: Drop patch number from version for 2.20 and later (no more 2.20.0)
• #296: Drop Java 6 compatibility for 2.20 (Java 8 baseline)

Streaming

• #1438: ParserBase.close() does not clear _currToken
• #1441: Add StreamReadFeature.CLEAR_CURRENT_TOKEN_ON_CLOSE (default: true)
• #1448: Upgrade FastDoubleParser to 2.0.1

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
• #5192: Record types are broken on Android when using R8
• #5194: Custom Throwable not serializable if using JsonAutoDetect settings that only detect Fields
• #5197: Add more informative exception for back-references with record type

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
• #603: Add support for writing unsigned numbers to CBOR

CSV

• #564: CsvParser.getNumberValue(), related, do not throw exception for non-numeric tokens

XML

• 768: FromXmlParser lacks extension point for passing custom XmlTokenStream

Changes, data types:

Guava

• #158: Increase minimum supported Guava from 20.x to 22.x for Jackson 2.20

Hibernate

• #184: Add jackson-datatype-hibernate7 module for Hibernate version 7
• #186: Update hibernate 6 code to avoid deprecated code

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