Grokking Spring Boot
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Choosing Between Beans

The venue asks for a second kind of confirmation: some customers want a text message as well as an email. The team turns Notifier into an interface with two implementations, EmailNotifier and SmsNotifier, and annotates both with @Component. BookingService still asks for a Notifier in its constructor. The next start of the service fails.

Parameter 2 of constructor in com.example.booking.bookings.BookingService required a single bean, but 2 were found:
	- emailNotifier: defined in file [...EmailNotifier.class]
	- smsNotifier: defined in file [...SmsNotifier.class]

Action:

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