How to Map a Source Object to the Target List Using MapStruct?

Date: 2025-04-25

This article demonstrates using MapStruct, a Java annotation processor, to map a source object to a target list. It details mapping a User object to a UserDTO list, showcasing features like derived fields, decorators for post-processing, and qualifiers for custom methods. The example includes creating User and UserDTO classes, a custom qualifier annotation, and a decorator to enhance the generated mapper. MapStruct simplifies complex mappings, improving code cleanliness and maintainability, even handling transformations from flattened data structures to structured lists.

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