Interface injection in Spring

[Manikandan Swaminathan]

Hi all,

I am new to Spring.

Can anyone of you please explain Interface Injection in Spring with a simple example?

Or is there any tutorial available for this?

I searched, but unable to find for interface injection in particular.

Have a great weekend !

Thanks

[Eduardo Bueno]

A simple example:

<bean id="someService" class="com.coderanch.SomeService">
    <property name="someRepository" ref="someRepository" />
</bean>
<bean id="someRepository" class="com.coderanch.SomeRepositoryImpl" autowire="byType" />

And now you just need a reference of the SomeRepository interface which will be injected (by type, since SomeRepositoryImpl implements SomeRepository) via setter method:

    
public class SomeService {

    private SomeRepository someRepository;

    public void setSomeRepository(SomeRepository someRepository) {
        this.someRepository = someRepository;
    }
}

[Hong Anderson]

Spring doesn't support Interface injection and the above example about autowiring is incorrect.
Will reply more later.

[Manikandan Swaminathan]

Hi Kengkaj,

Can you please post the details?

If possible please mail me the details. My mail id is [e-mail]

Thanks for your help !

Regards

[Jaydeep Mazumdar]

Spring does not fully support Interface injection although the same can be achieved using "autowire=byType". But this has some serious drawbacks. See this discussion for a proposed implementation of Interace injection in Spring:
http://opensource.atlassian.com/confluence/spring/display/DISC/Adding+Interface+Injection+to+Spring