What is primary annotation in Spring?

primary annotation sets the bean to get preference when multiple candidates are qualified to auto-wire a single-valued dependency.

 @Component
 public class UtilService {

     private UtilRepository utilRepository;

     @Autowired
     public UtilService(UtilRepository utilRepository) {
         this.utilRepository = utilRepository;
     }
 }

 @Component
 public class JdbcUtilRepository implements UtilRepository {

     public JdbcUtilService(DataSource dataSource) {
         // ...
     }
 }

 @Primary
 @Component
 public class HibernateUtilRepository implements UtilRepository {

     public HibernateUtilService(SessionFactory sessionFactory) {
         // ...
     }
 }
 

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