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Different ways of dependency injection

 
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Hello,

I have a question about Context lookups and dependency Injection regarding the following scenario:

I'm using JBoss 6, JSF 2.0, EJB 3.1
I have and ejb jar and a war archive packaged together in an ear.
My ejb-jar contains a stateless, no interface session bean.
My war has a session scoped managed bean.

Inside my managed bean, I use the EJB annotation to inject an instance of my no-interface session bean - works like a charm!
When I deploy the ejb-jar and the war archives separately (without the ear) I get an error, stating that "Could not resolve @EJB reference ... ". However when I remove the EJB annotation in my managed bean and do a "InitialContext.doLookup("..."), I get NO errors and everything is fine.

Why doesn't dependency Injection using the EJB annotation work when deploying the artifacts sepeparately but a manual lookup does?
(I first deploy my ejb-jar and afterwards I deploy the war.)

Does anyone have a clue?
 
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