Spring Framework & interfaces

[Kunal Sathe]

Hello All,

I am new to Spring Framework and hence this question.

Is it always necessary to create Interfaces and implementation classes in order to take advantage of Inversion Of Control?

Thanks,
Kunal

[Hussein Baghdadi]

I'm not Spring authority but no, I don't think so.
Creating interfaces and implementing classes is a best practice/

[Mark Spritzler]

John Todd wrote:I'm not Spring authority but no, I don't think so.
Creating interfaces and implementing classes is a best practice/

If you want to configure transactions or AOP or other integrations that causes Spring to create a Proxy, then it will need an interface for the real object as it uses DynamicProxies to create those proxies. You can still not have an interface, but you have to add a configuration to those beans to use CGLib and generate proxies by subclassing the real class you want to make a proxy for.

Mark

[Hong Anderson]

You can use IoC without using interfaces. Anyway, when doing object-oriented whether you're using IoC or not, you should have interfaces to make the design flexible and easy to understand.

[Svein Erik Løvland]

and it makes Unit-testing easier.

[Kunal Sathe]

Thanks folks!