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

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As commented by brettanomyces, the service won’t be injected if it is not used in mapping operations other than expressions.

The only way I found to this is :

  • Transform my mapper interface into an abstract class
  • Inject the service in the abstract class
  • Make it protected so the “implementation” of the abstract class has access

I’m using CDI but it should be the samel with Spring :

@Mapper(
        unmappedTargetPolicy = org.mapstruct.ReportingPolicy.IGNORE,
        componentModel = "spring",
        uses = {
            // My other mappers...
        })
public abstract class MyMapper {

    @Autowired
    protected MyService myService;

    @Mappings({
        @Mapping(target="x", expression="java(myservice.findById(obj.getId())))")
    })
    public abstract Dto myMappingMethod(Object obj);

}

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