Grokking Spring Boot
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Constructor Injection

@Service
public class BookingService {
    @Autowired
    private SeatRepository seats;
    @Autowired
    private PaymentClient payments;
    @Autowired
    private Notifier notifier;

    public String book(String seatLabel, String email) { ... }
}

This version of BookingService has no constructor. Spring fills the three fields, and the running service books seats correctly. When we ran the booking project with this class, the application started with no errors.

A plain unit test of the same class failed at its first use of a dependency:

java.lang

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