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GeezerVison is showing github.com — Improve support for Kotlin Data Classes by filiphr · Pull Request #3978 · mapstruct/mapstruct

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@filiphr

@filiphr filiphr commented Jan 29, 2026

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  • Properly handle single field data classes
  • Properly handle multi constructor data classes
  • Properly handle all defaults constructor data classes

This resolves different Kotlin related issues:

  • Fixes Not using kotlin primary constructor #2577 - Not using Kotlin data primary constructor
  • Fixes Kotlin Data class with all nullable fields is not mapped to the target class fields #3031 - Kotlin Data class with all nullable fields is not mapped to the target class fields
  • Fixes Kotlin: problems with data classes #2281 - Kotlin: problems with data classes

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filiphr added 2 commits January 29, 2026 10:28
@filiphr
Improve support for Kotlin Data Classes
15c80b5 
* Properly handle single field data classes
* Properly handle multi constructor data classes
* Properly handle all defaults constructor data classes
@filiphr
Add docs
fa9cc42
@filiphr
filiphr merged commit d300664 into mapstruct:main Jan 29, 2026
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@filiphr
filiphr deleted the kotlin-data-classes branch January 29, 2026 11:30
@filiphr filiphr mentioned this pull request Jan 29, 2026
Instantiate Kotlin data classes using the _primary_ constructor #2933
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Kotlin Data class with all nullable fields is not mapped to the target class fields Not using kotlin primary constructor Kotlin: problems with data classes

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@filiphr
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