Issues

• ProcessorTests are currently unable to reload Mapper implementation class

  bugtest
  mapstruct/mapstruct#4132 · Filter by author hduelme opened on Sep 19, 2026

• NullValuePropertyMappingStrategy.IGNORE strategy ignored for Optional fields

  bug
  mapstruct/mapstruct#4128 · Filter by author ijioio opened on Sep 16, 2026

• Optional source property that is itself null throws NullPointerException on the generated isPresent() check; NullValueCheckStrategy.ALWAYS is ignored

  mapstruct/mapstruct#4123 · Filter by author velo opened on Sep 9, 2026
  1

• Collections no longer copied if marked non-null

  bugJSpecify
  mapstruct/mapstruct#4118 · Filter by author gbodenSolum opened on Aug 25, 2026
  

• Optional<Map> / Optional<Collection> source property generates unguarded Optional#get, throwing NoSuchElementException when empty

  mapstruct/mapstruct#4111 · Filter by author surecloud-jleite opened on Aug 14, 2026
  1

• Be able to generate the nullable mapping from the NotNull mapping

  JSpecify
  mapstruct/mapstruct#4106 · Filter by author pkernevez opened on Aug 4, 2026
  

• Strategy to check at runtime the null value with JSpecifiy

  mapstruct/mapstruct#4105 · Filter by author pkernevez opened on Aug 4, 2026
  1

• Do not return null when the return value is kown to be @Notnull

  JSpecify
  mapstruct/mapstruct#4104 · Filter by author pkernevez opened on Aug 4, 2026
  

• Silent default mapping on conflicting ignore properties flags

  bug
  mapstruct/mapstruct#4094 · Filter by author Eliiona opened on Jul 14, 2026
  1

• JSpecify: False positive error for nullable source with nullable-param non-null-return method

  bugJSpecify
  mapstruct/mapstruct#4086 · Filter by author RaniAgus opened on Jul 4, 2026 · 1.7.0.RC1
  1

  

• Java21 SequencedCollection::getFirst support

  enhancement
  mapstruct/mapstruct#4082 · Filter by author jbidet-adis opened on Jun 29, 2026

• JSpecify: Missing compile error when reused method returns @Nullable to @NonNull constructor

  bugJSpecify
  mapstruct/mapstruct#4081 · Filter by author RaniAgus opened on Jun 28, 2026 · 1.7.0.RC1
  

• JSpecify: Missing null check before reusing non-nullable method

  bugJSpecify
  mapstruct/mapstruct#4077 · Filter by author RaniAgus opened on Jun 28, 2026 · 1.7.0.RC1
  

• JSpecify: Propagate nullability annotations to mapper implementation

  bugJSpecify
  mapstruct/mapstruct#4076 · Filter by author RaniAgus opened on Jun 27, 2026 · 1.7.0.RC1
  4

  

• Parallel source and target traversal with @ParallelSource

  mapstruct/mapstruct#4066 · Filter by author wernerdegroot opened on Jun 6, 2026
  2

• Mapstruct mapping incorrect properties when one of them is supporting adder

  bug
  mapstruct/mapstruct#4038 · Filter by author altaiezior opened on Apr 19, 2026
  6

• @Condition applied on wrong source parameter while mapping

  bug
  mapstruct/mapstruct#4037 · Filter by author altaiezior opened on Apr 16, 2026 · 1.7.x
  1

• Decide whether or not we should mark generated code with JSpecify annotations

  enhancementJSpecify
  mapstruct/mapstruct#4036 · Filter by author filiphr opened on Apr 13, 2026 · 1.7.x
  1

• Review JSpecify nullness on type user array elements and lists

  enhancementJSpecify
  mapstruct/mapstruct#4035 · Filter by author filiphr opened on Apr 13, 2026 · 1.7.x
  3

• Cache Type instances in TypeFactory.getType(...) to avoid redundant work

  mapstruct/mapstruct#4034 · Filter by author filiphr opened on Apr 13, 2026
  1

• Getters can be computed twice when nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS

  bughack.commit.push
  mapstruct/mapstruct#4030 · Filter by author altaiezior opened on Apr 8, 2026

• ADDED_PREFFERED should fallback to SETTER_PREFERRED when direct list mapping is given

  bug
  mapstruct/mapstruct#4029 · Filter by author altaiezior opened on Apr 8, 2026
  1

• Offer a flag for exact numeric conversions

  mapstruct/mapstruct#4017 · Filter by author lauroschuck opened on Mar 20, 2026
  2

• Add compiler flag to disable automatic String-To-Enum conversions

  hack.commit.push
  mapstruct/mapstruct#4004 · Filter by author tram98 opened on Feb 26, 2026
  1

• Condition: Add @MappingTargetValue as parameter

  mapstruct/mapstruct#4001 · Filter by author newhinton opened on Feb 24, 2026
  1