MapStruct
MapStruct is a Java annotation processor that generates type-safe and performant bean mapping code at compile time. It automates the conversion between Java beans, reducing boilerplate code and eliminating runtime reflection overhead. Developers define mapping interfaces with annotations, and MapStruct creates the implementation classes.
Developers should use MapStruct when working with layered architectures like DTOs, entities, or API models in Java applications, as it simplifies data transformation between different object representations. It's particularly valuable in Spring Boot or Jakarta EE projects for mapping between persistence entities and REST API DTOs, ensuring type safety and high performance compared to manual mapping or reflection-based libraries.