FasterXML/jackson-module-kotlin

View on GitHub

Module that adds support for serialization/deserialization of Kotlin (http://kotlinlang.org) classes and data classes.

Stars: 1.2k
Forks: 187
Open beginner issues: 0
Indexed issues: 46
Avg merge: 9h 48m
Merged PRs (30d): 16

Dominant language: Kotlin
License: Apache-2.0
Last GitHub push: Sep 4, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Open All

46 open issues indexed

Take into account Java Optional when calculating the property's required marker Open

FasterXML/jackson-module-kotlin#204 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Kotlin default values do not work for missing fields when using polymorphism with JsonTypeInfo.As.EXTERNAL_PROPERTY Open

FasterXML/jackson-module-kotlin#249 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Reified types are not inlined into type references of generic classes Open

FasterXML/jackson-module-kotlin#243 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Classes with properties from both constructor and fields are not alphabetically sorted with @JsonPropertyOrder Open

has-test-case

FasterXML/jackson-module-kotlin#271 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Simplest way to use @JsonManagedReference Open

FasterXML/jackson-module-kotlin#294 · 5 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson doesn't see companion object @JsonCreators unles they also have @JvmStatic Open

bug

FasterXML/jackson-module-kotlin#355 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Replace bits of KotlinNamesAnnotationIntrospector with AccessorNamingStrategy Open

enhancement

FasterXML/jackson-module-kotlin#389 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Create performance tests for Kotlin module Open

enhancement

FasterXML/jackson-module-kotlin#390 · 2 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026
JsonTypeInfo + interface = serialization-deserialization problems Open

bug

FasterXML/jackson-module-kotlin#395 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
XML: Support Kotlin's `object { ... }` as a List wrapper Open

FasterXML/jackson-module-kotlin#415 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Is it possible to allow functions *outside* of a class definition to be used as a JsonCreator or similar? Open

enhancement

FasterXML/jackson-module-kotlin#435 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Way to ignore properties from delegate Open

enhancement

FasterXML/jackson-module-kotlin#459 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
There are some problems with KNAI.findDefaultCreator Open

bug

FasterXML/jackson-module-kotlin#547 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
This module shouldn't bring kotlin-reflect 1.5 as a transitive dependency Open

bug

FasterXML/jackson-module-kotlin#566 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Exception when using @JsonIdentityInfo Open

bug

FasterXML/jackson-module-kotlin#571 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
If the value wrapped in `value class` is `null`, it is not excluded from serialization Open

enhancement value class

FasterXML/jackson-module-kotlin#625 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Annotation given to constructor parameters containing `value class` as argument does not work Open

bug enhancement value class

FasterXML/jackson-module-kotlin#651 · 13 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
How to deserialize a kotlin.ranges.ClosedRange<T> with Jackson Open

enhancement

FasterXML/jackson-module-kotlin#663 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
2.15.0 does not seem to honor PropertyAccessor.IS_GETTER visibility anymore Open

bug

FasterXML/jackson-module-kotlin#669 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Enhance `Sequence` support Open

enhancement

FasterXML/jackson-module-kotlin#671 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`kotlin.jvm.internal.ArrayIterator` serialization result is not as expected. Open

bug

FasterXML/jackson-module-kotlin#674 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deserialization fails for local data class with local default value Open

bug

FasterXML/jackson-module-kotlin#712 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support Value Classes 2.0 Open

enhancement value class

FasterXML/jackson-module-kotlin#714 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Improve serialization performance of value classes that require only unboxing. Open

2.17 enhancement value class

FasterXML/jackson-module-kotlin#715 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Jackson 2.12.3 and later fails to collapse XML list using @JsonAlias Open

bug

FasterXML/jackson-module-kotlin#721 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deserialization fails for class with single private accessor property Open

bug

FasterXML/jackson-module-kotlin#753 · 7 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
If a creator parameter contains a `value class` that wraps nullable and is non-null and has a default value, deserialization using the default argument will fail. Open

bug value class

FasterXML/jackson-module-kotlin#761 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Polymorphic sealed class missing type information Open

question

FasterXML/jackson-module-kotlin#765 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Excessive memory usage when using KotlinModule with Kotlin data class Open

bug

FasterXML/jackson-module-kotlin#774 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Boolean property setter is skipped if name isX prefixed Open

bug

FasterXML/jackson-module-kotlin#798 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Return multiple missing kotlin parameters at once Open

enhancement

FasterXML/jackson-module-kotlin#806 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Serialization and Deserialization of Kotlin `data class` fails on PolymorphicTypeValidator with Any Open

enhancement value class

FasterXML/jackson-module-kotlin#819 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Missing empty constructor issue: deserialization breaking change from 2.17 to 2.18 Open

bug

FasterXML/jackson-module-kotlin#846 · 24 comments · 15 reactions · 0 assignees · Indexed Sep 15, 2026
Deserialization of Custom Wrapper Class Fails in Jackson 2.18.1 Without Nested Object Structure Open

to-evaluate

FasterXML/jackson-module-kotlin#865 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`DecerializationProblemHandler` is ignored when the input is invalid `null` in `KotlinValueInstantiator` Open

bug

FasterXML/jackson-module-kotlin#875 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Remove `NullToEmpty` options or change backend Open

enhancement

FasterXML/jackson-module-kotlin#877 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Feature flag to serialize unitialized lateinit properties into null Open

enhancement

FasterXML/jackson-module-kotlin#882 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deserialization of generic class with nullable values failes Open

bug

FasterXML/jackson-module-kotlin#917 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deserialization issue, @JsonCreator ignored Open

bug

FasterXML/jackson-module-kotlin#932 · 13 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Make it possible to get information about creator functions from `KotlinInvalidNullException` Open

enhancement

FasterXML/jackson-module-kotlin#1026 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
3.0 regression deserialization fails on nulls in nested structures under beans, even if type allows it Open

bug

FasterXML/jackson-module-kotlin#1064 · 3 comments · 10 reactions · 0 assignees · Indexed Sep 15, 2026
Non-deterministic method lookup for Kotlin Data Classes Open

bug

FasterXML/jackson-module-kotlin#1081 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Add KotlinFeature to exclude compiler-generated `$delegate` backing fields from serialization Open

enhancement

FasterXML/jackson-module-kotlin#1102 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Invalid targetType in KotlinInvalidNullException Open

enhancement

FasterXML/jackson-module-kotlin#1140 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
A `DatabindException` is thrown when processing a class that has a getter defined that is interpreted similarly to the property name of the `value class` Open

bug value class

FasterXML/jackson-module-kotlin#1152 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[GLD Serializer Benchmark] Kotlin jackson 2.19.0 — spec compliance misses Open

FasterXML/jackson-module-kotlin#1226 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

FasterXML/jackson-module-kotlin

Get new issues in your inbox