Java dependency injection with Java EE?

[Harit Himanshu]

Hello

I am learning Akka and immediately one question popped up in my mind.

I use Java EE dependency injection a lot in my projects for following reasons

1. Inject dependencies on run time so that I can test them
2. Injecting different properties (*.properties) which are usually part of src/main/resources

I was wondering how these mechanism are achieved in Akka or if Java EE and Akka play well together.

Thoughts?

Thanks a lot

+ Harit Himanshu

[Akka Team]

Hi Harit,

Dependency injection as it is implemented by these frameworks is not as useful with Akka, since actor creation must be always controlled by Akka itself (otherwise supervision would not work). Nevertheless, this post contains some pointers:

http://letitcrash.com/post/55958814293/akka-dependency-injection

-Endre

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[Chanan Braunstein]

You can still benefit from Dependency Injection and keep supervision working. For example my project: AkkaGuice: https://github.com/chanan/AkkaGuice

You can choose to inject a fully formed actor into your code (with all its dependencies resolved) which will indeed only give you a top level actor, but you can also use the PropsContext which will give you the resolved props of an actor to be used as a child actor.

Chanan. 

[Harit Himanshu]

Thanks! I will look at the pointers and keep that suggestion in mind while designing apps

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