Mapstruct - How can I inject a spring dependency in the Generated Mapper class

Question

I need to inject a spring service class in the generated mapper implementation, so that I can use it via

   @Mapping(target=\"x\", expression=\"java(myservi         


        

Answer 1

I am using Mapstruct 1.3.1 and I have found this problem is easy to solve using a decorator.

Example:

@Mapper(unmappedTargetPolicy = org.mapstruct.ReportingPolicy.IGNORE,
 componentModel = "spring")
@DecoratedWith(FooMapperDecorator.class)
public interface FooMapper {

    FooDTO map(Foo foo);
}

public abstract class FooMapperDecorator implements FooMapper{

    @Autowired
    @Qualifier("delegate")
    private FooMapper delegate;

    @Autowired
    private MyBean myBean;

    @Override
    public FooDTO map(Foo foo) {

        FooDTO fooDTO = delegate.map(foo);

        fooDTO.setBar(myBean.getBar(foo.getBarId());

        return fooDTO;
    }
}

Mapstruct will generate 2 classes and mark the FooMapper that extends FooMapperDecorator as the @Primary bean.