ModelMapper
ModelMapper is a Java library that simplifies object mapping by automatically copying data between objects, such as from domain models to data transfer objects (DTOs). It uses conventions and configuration to map properties with matching names and types, reducing boilerplate code for manual mapping. This tool is particularly useful in layered architectures like MVC or microservices, where objects need transformation between different layers.
Developers should use ModelMapper when building applications with complex object hierarchies that require frequent conversions between similar but distinct object types, such as in REST APIs where entity objects must be mapped to response DTOs. It saves time and reduces errors by automating repetitive mapping logic, especially in projects with many domain classes or when integrating with frameworks like Spring Boot. However, it's best suited for straightforward mappings; for complex transformations with custom logic, manual mapping or other tools might be more appropriate.