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mapstruct

7 indexed repositories · View on GitHub

mapstruct
An annotation processor for generating type-safe bean mappers

Java · 7692 stars
mapstruct-examples
Examples for using MapStruct

Java · 1354 stars
mapstruct-spring-extensions
Helpful additions to MapStruct when using the Spring Framework.

Java · 181 stars
mapstruct-idea
An IntelliJ IDEA plugin for working with MapStruct

Java · 168 stars
mapstruct.org
Web site of the MapStruct project

CSS · 71 stars
tools-gem
Tool for generating annotation helper code

Java · 21 stars
mapstruct-eclipse
An Eclipse plug-in for working with MapStruct

Java · 12 stars

Beginner friendly Everything

Open All

NullValuePropertyMappingStrategy.IGNORE strategy ignored for Optional fields Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mapstruct/mapstruct#4128 · Opened Sep 16, 2026
Optional source property that is itself null throws NullPointerException on the generated isPresent() check; NullValueCheckStrategy.ALWAYS is ignored Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

mapstruct/mapstruct#4123 · 1 comment · Opened Sep 9, 2026
Collections no longer copied if marked non-null Open

bug JSpecify

mapstruct/mapstruct#4118 · 1 assignee · Opened Aug 25, 2026
Optional<Map> / Optional<Collection> source property generates unguarded Optional#get, throwing NoSuchElementException when empty Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

mapstruct/mapstruct#4111 · 1 comment · Opened Aug 14, 2026
When using Jimmer, the plugin fails to correctly identify the entity's properties. Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mapstruct/mapstruct-idea#274 · Opened Aug 8, 2026
Be able to generate the nullable mapping from the NotNull mapping Open

JSpecify

mapstruct/mapstruct#4106 · 1 assignee · Opened Aug 4, 2026
Strategy to check at runtime the null value with JSpecifiy Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mapstruct/mapstruct#4105 · 1 comment · Opened Aug 4, 2026
Do not return null when the return value is kown to be @Notnull Open

JSpecify

mapstruct/mapstruct#4104 · 1 assignee · Opened Aug 4, 2026
Silent default mapping on conflicting ignore properties flags Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

mapstruct/mapstruct#4094 · 1 comment · Opened Jul 14, 2026
JSpecify: False positive error for nullable source with nullable-param non-null-return method Open

bug JSpecify

mapstruct/mapstruct#4086 · 1 comment · 1 assignee · Opened Jul 4, 2026
Java21 SequencedCollection::getFirst support Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mapstruct/mapstruct#4082 · Opened Jun 29, 2026
JSpecify: Missing compile error when reused method returns `@Nullable` to `@NonNull` constructor Open

bug JSpecify

mapstruct/mapstruct#4081 · 1 assignee · Opened Jun 28, 2026
JSpecify: Missing null check before reusing non-nullable method Open

bug JSpecify

mapstruct/mapstruct#4077 · 1 assignee · Opened Jun 28, 2026
JSpecify: Propagate nullability annotations to mapper implementation Open

bug JSpecify

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mapstruct/mapstruct#4076 · 4 comments · Opened Jun 27, 2026
Parallel source and target traversal with `@ParallelSource` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

mapstruct/mapstruct#4066 · 2 comments · Opened Jun 6, 2026
Add inspection for unmapped source properties Open

feature hack.commit.push

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mapstruct/mapstruct-idea#267 · Opened Jun 3, 2026
Report error for result types with wildcard extends bound Open

feature hack.commit.push

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mapstruct/mapstruct-idea#266 · Opened Jun 3, 2026
Source value mapped more than once inspection for @ValueMapping Open

feature hack.commit.push

Difficulty 3/5 1-2 days Newbie friendliness 75/100

mapstruct/mapstruct-idea#265 · Opened Jun 3, 2026
Mapstruct mapping incorrect properties when one of them is supporting adder Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

mapstruct/mapstruct#4038 · 6 comments · Opened Apr 19, 2026
@Condition applied on wrong source parameter while mapping Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

mapstruct/mapstruct#4037 · 1 comment · Opened Apr 16, 2026
Decide whether or not we should mark generated code with JSpecify annotations Open

enhancement JSpecify

Difficulty 5/5 Over a week Newbie friendliness 35/100

mapstruct/mapstruct#4036 · 1 comment · 3 reactions · Opened Apr 13, 2026
Review JSpecify nullness on type user array elements and lists Open

enhancement JSpecify

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mapstruct/mapstruct#4035 · 3 comments · Opened Apr 13, 2026
Cache `Type` instances in `TypeFactory.getType(...)` to avoid redundant work Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mapstruct/mapstruct#4034 · 1 comment · Opened Apr 13, 2026
Getters can be computed twice when nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS Open

bug hack.commit.push

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mapstruct/mapstruct#4030 · Opened Apr 8, 2026
ADDED_PREFFERED should fallback to SETTER_PREFERRED when direct list mapping is given Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

mapstruct/mapstruct#4029 · 1 comment · Opened Apr 8, 2026
Offer a flag for exact numeric conversions Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

mapstruct/mapstruct#4017 · 2 comments · Opened Mar 20, 2026
Add compiler flag to disable automatic String-To-Enum conversions Open

hack.commit.push

Difficulty 5/5 Over a week Newbie friendliness 35/100

mapstruct/mapstruct#4004 · 1 comment · 2 reactions · Opened Feb 26, 2026
Condition: Add @MappingTargetValue as parameter Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

mapstruct/mapstruct#4001 · 1 comment · 1 reaction · Opened Feb 24, 2026
Camelcase fields where the second letter is capitalized are not picked up Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

mapstruct/mapstruct#4000 · 1 comment · 1 reaction · Opened Feb 20, 2026
@InheritInverseConfiguration ignores "ignore = true" for nested source fields Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mapstruct/mapstruct#3997 · Opened Feb 17, 2026
Ambiguous presence check methods issue with optional @Context for @Condition Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mapstruct/mapstruct#3993 · Opened Feb 9, 2026
MapStruct ignores primitive parameters when all non-primitive parameters are null due to generated null-check logic Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mapstruct/mapstruct#3992 · 1 reaction · Opened Feb 7, 2026
Unexpected warning: ''.'' should not be used as a source Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct-idea#257 · 1 comment · Opened Feb 6, 2026
Support autocompletion when using `Optional` Open

hack.commit.push

Difficulty 5/5 Over a week Newbie friendliness 20/100

mapstruct/mapstruct-idea#256 · Opened Jan 31, 2026
idea Plugin errors Open

bug closing-when-no-response

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mapstruct/mapstruct#3985 · 1 comment · Opened Jan 31, 2026
Use `Optional#orElseThrow` instead of `Optional#get` Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mapstruct/mapstruct#3976 · 1 reaction · Opened Jan 27, 2026
Plugin won't recognize @Named class Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct-idea#247 · Opened Dec 8, 2025
Completion for java "expression" does't work with DTO as records Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct-idea#245 · Opened Nov 27, 2025
Mapstruct not working with Kotlin/Kapt 2.3.0-RC Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mapstruct/mapstruct#3960 · 7 comments · 3 reactions · Opened Nov 20, 2025
mapstruct doesn't support package private getters Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mapstruct/mapstruct#3947 · Opened Oct 17, 2025
error: expression not allowed as annotation value false positive and error on wrong field Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mapstruct/mapstruct#3946 · Opened Oct 17, 2025
Cannot create mapping method with single primitive argument Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mapstruct/mapstruct#3943 · Opened Oct 14, 2025
Support for Builder like "record-builder" Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

mapstruct/mapstruct#3937 · 1 comment · 1 reaction · Opened Sep 25, 2025
@SubclassMapping does not throw IllegalArgumentException when sealed source has subclasses and target does not Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mapstruct/mapstruct#3936 · 1 comment · Opened Sep 24, 2025
Inject the AccessorNamingStrategy methods a list of fields extracted for the same class of the method being processed Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mapstruct/mapstruct#3934 · Opened Sep 18, 2025
MapStructProcessingEnvironment must provide access to the Logger component Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct#3933 · Opened Sep 18, 2025
Add a configuration where we can select the AccessorNamingStrategy to use Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mapstruct/mapstruct#3932 · Opened Sep 18, 2025
DeepClone does not clone java.util.Date fields but perform a copy reference Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct#3931 · 1 reaction · Opened Sep 16, 2025
Documentation: one dependency more required in Maven for mapStruct to work Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mapstruct/mapstruct#3930 · 4 comments · Opened Sep 15, 2025
JAXB ObjectFactory Mapping with Dash (-) Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mapstruct/mapstruct#3928 · 1 comment · Opened Sep 11, 2025

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