Spring 5 Design Patterns

Resolving disambiguation in Autowiring DI pattern

Spring provides one more annotation, @Qualifier, to overcome the problem of disambiguation in autowiring DI. Let's see the following snippet of code with the @Qualifier annotation:

    @Service 
    public class TransferServiceImpl implements TransferService { 
    @Autowired 
    public TransferServiceImpl( @Qualifier("jdbcAccountRepository")    AccountRepository accountRepository) { ... } 

Now I have wired the dependency by name rather than by type by using the @Qualifier annotation. So, Spring will search the bean dependency with the name "jdbcAccountRepository" for the TransferServiceImpl class. I have given the names of the beans as follows:

 @Repository("jdbcAccountRepository") public class JdbcAccountRepository ...