Spring. Dynamic dependency injection

Question

I have the following problem.

I have a generic class A

public class A<T, DAO extends JpaRepository<?, ?>>
{    

    @Autowired
    protected DAO daoObject;

    ......

and there I am trying inject a genreic DAO-object of the JpaRepository-type.

If I have only one implemetation of injected object(of JpaRepository), then there is no problem, but if I have more then one, then spring doesn't know which object it is to inject and throws an exception.

The question is: How can I dynamish based on generic information, inject the correct object?

Thank you.

public interface IRegisteredUserDAO extends JpaRepository<RegisteredUser, String> {

}


public interface IMailLogDao extends JpaRepository<MailLog, Long> {

   findByTo(String to);
}

and i used it so

public class RegisteredUserVM extends YBTableViewModel<RegisteredUser, IRegisteredUserDAO>
{

UPDATE:

public class MailLogVM extends YBTableViewModel<MailLog, IMailLogDao>
{    

}

score 2 · Answer 1 · answered Nov 06 '13 at 10:04

2

You can use Spring's @Qualifier annotation to inject the correct bean:

@Autowired
@Qualifier("IRegisteredUserDAOImpl")
protected DAO daoObject;

Here the bean with qualifier value "IRegisteredUserDAOImpl" is wired.

answered Nov 06 '13 at 10:04

Debojit Saikia

10,532
3
35
46

no, I can not. I need dynamic there. I corrects my question. see above – user1167253 Nov 06 '13 at 10:49
are you looking for something like this : http://stackoverflow.com/questions/502994/spring-ioc-and-generic-interface-type – Debojit Saikia Nov 06 '13 at 10:58

score 2 · Accepted Answer · answered Nov 06 '13 at 21:19

2

You should be able to do this using the latest Spring 4 RC1. Versions before that do not support generic injection at all. See this ticket and related commits for details.

answered Nov 06 '13 at 21:19

Oliver Drotbohm

80,157
18
225
211

Spring. Dynamic dependency injection

2 Answers2

Linked