Learn how to efficiently map Java objects with MapStruct, the annotation-based code generator that eliminates boilerplate mapping code.
- Pain points of manual DTO mapping
- Comparison with other mapping solutions (Dozer, ModelMapper, manual)
- MapStruct's compile-time code generation advantage
- Basic setup with Maven/Gradle
- Creating a basic mapper interface
- Understanding @Mapping annotations
- Field name conventions and automatic mapping
- Testing your generated mapper
- Custom methods for complex transformations
- Handling nested objects
- Dealing with different field names (@Mapping target/source)
- Type conversions (String ↔ Date, enums, etc.)
- Injecting mappers as Spring beans
- Best practices for layered architectures
- Performance comparison with reflection-based mappers
- Integration with Lombok
- Mapping Lists, Sets and Maps
- Using @AfterMapping and @BeforeMapping
- Creating and using decorators
- Handling null values gracefully
- DTO to Entity mapping patterns
- Partial updates with @BeanMapping(ignoreByDefault)
- Debugging mapping issues
- Generating mapper implementations at build time
1. MapStruct Introduction: Why Manual Mapping Sucks
2. Your First Mapper: From @Mapper to Perfect DTOs
3. Advanced Mapping Techniques
4. MapStruct in Spring Boot Applications
5. Beyond Basics: Collection Mapping and Custom Mappers
6. Real-World Patterns and Troubleshooting
What You'll Need
- Java 8+ knowledge
- Basic understanding of POJOs/DTOs
- Experience with build tools (Maven/Gradle)
- Optional: Spring Boot familiarity
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