How to autowire Spring services that inherit?

Question

I have 2 services, EFT and Cheque that are substantially similar.

Runs fine if I mark the implementation as @service.

Otherwise I get a no such bean definition exception. No qualifying bean of type 'EftPaymentService'.

Top level interface.

public interface PaymentService { public void paymentsResponse(); }

Eft service interface.

@Service public interface EftPaymentService extends PaymentService { public void processEft(String code) throws PaymentsException; }

Cheque service interface

@Service public interface ChequePaymentService extends PaymentService { public void processCheque(String code) throws PaymentsException; }

Top level implementation

public abstract class PaymentServiceImpl implements PaymentService { @Autowired protected SessionFactory sftpSessionFactory; @Autowired protected SftpConfig.UploadGateway gateway; public void paymentsResponse(){ } }

Eft implementation

public class EftServiceImpl extends PaymentsServiceImpl implements EftPaymentService { }

Cheque implementation

public class ChequeServiceImpl extends PaymentsServiceImpl implements ChequePaymentService { }

What is going on here? Refactor using composition?

Did you check in the logs to see if the implementation class was scanned? — zatopek
– zatopek, Commented Nov 28, 2017 at 2:32
Marking the implementation as @Service is what you should do, what exactly is the problem? — Oleg
– Oleg, Commented Nov 28, 2017 at 2:39
Yes, it is. You found the question now all that's left is read the answers and understand them. — Oleg
– Oleg, Commented Nov 28, 2017 at 2:53

Jamie Bisotti · Accepted Answer · 2017-11-28 02:53:17Z

3

Annotate implementations with @Service & use constructor-based injection.

answered Nov 28, 2017 at 2:53

Jamie Bisotti

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2 Comments

Interlated Over a year ago

This works. Have been annotating the services on the basis that referencing the interface is more generic. It doesn't work in this case, although I still don't quite know why.

Jamie Bisotti Over a year ago

@Service is just a specialization of @Component; they behave exactly the same. By its name, the former communicates some additional intent. I believe the intent of @Component (thus @Service) it to annotate Spring "bean" implementations, which are typically concrete classes, not interfaces. I guess I'm saying I wouldn't expect putting it on an interface to ever work. Good luck.

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