Spring @Primary Annotation Example
In this section we will learn about @Primary Annotation. When there are multiple beans of the same data-type in Spring container , all of them are qualified to be autowired to single-valued dependency. That causes ambiguity and leads to throw an exception by framework. To avoid this issue, we can use the Spring-specific @Primary annotation that automatically gives the higher preference to a particular bean. This annotation can be used on any class annotated with the @Component , @Service & @Repository annotation or on methods annotated with the @Bean annotation. There should be only one @Primary bean among same type of beans. Using @Primary with @Bean Create MessageService interface for message service implementations. public interface MessageService { void printMessaage (); } Create implementations - SMSService and EmailService classes. public class SMSService implements MessageService{ @Override public void printMessaage() { System.out.printl