@RestController
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
class Controller {

    /* inject here */
    public @NonNull GenericService service;

    public void doo(List<GenericDTO> list, String type) {
        service.doo(list);
    }

}

class GenericDTO { ... }
class GenericService { ... }

class OfferService extends GenericService { ... }
class OtherService extends GenericService { ... }

Class MyController {

    Map<String, GenericService> servicesMap = new HashMap<String, GenericService>();

    @Autowired
    public setServices(List<GenericService> serviceList) {
        for (GenericService service : serviceList) {
             if (service instanceof OfferService) {
                serviceMap.put("offer", service);
             }
             if (service instanceof OtherService) {
                serviceMap.put("other", service);
             }
    }

    public void doo(List<GenericDTO> list, String type) {
        GenericService service = serviceMap.get(type);
        if (null != service) {
             service.doo(list);
        }
    }
}

Class GenericService {

     // This method could very well be an abstract method or a simple
     // getter for a property set through ctor

     public String getType() {
          return "unknown"; // or "generic" if you please
     }

}

Class OfferClass extends GenericService {
     @Override
     public String getType() {
          return "offer";
     }
}

Class OtherClass extends GenericService {
     @Override
     public String getType() {
          return "other";
     }
}

Class MyController {

    Map<String, GenericService> servicesMap = new HashMap<String, GenericService>();
    // This is just there so that we do not have to process the
    // list everytime we need to invoke the service

    @Autowired
    public setServices(List<GenericService> serviceList) {
        for (GenericService service : serviceList) {
            serviceMap.put(service.getType(), service)
        }
    }

    public void doo(List<GenericDTO> list, String type) {
        GenericService service = serviceMap.get(type);
        if (null != service) {
             service.doo(list);
        }
    }
}