JSF Managed Bean Injection

[Kumar Amit]

Hi Friends,
Any idea whether we can Inject one JSF managed bean as a property into another JSF backing bean/managed bean?

I am trying to create a layer of abstraction between my backing beans and ejbs by creating a single managed bean that will have @EJB annotation to invoke the bean. This is my version of business delegate or service layer.
JSF Backing Bean -> JSF ManagedBean (Coordinator) ->EJB

[Jeanne Boyarsky]

Moved to the JSF forum. Even though you are asking due to the exam, it's a fairly specific JSF question and someone here is more likely to know.

[M. A. Riveros T.]

@ManagedBean
@ApplicationScoped
public class ToInject { 
}

and

@ManagedBean
@SessionScoped
public class ToBeInjected {
	@ManagedProperty(value="#{toInject}")
	protected ToInject toInject ;
}

[Kumar Amit]

M. A. Riveros T. wrote:

@ManagedBean
@ApplicationScoped
public class ToInject { 
}

and

@ManagedBean
@SessionScoped
public class ToBeInjected {
	@ManagedProperty(value="#{toInject}")
	protected ToInject toInject ;
}

Thanks Riveros. Can I have both these managed beans as "request scoped"?

Also can i use "@EJB" annotation in "ToBeInjected" managed bean class after making request scoped.

Thanks

Amit

[Tim Holloway]

The rule on injection is that you can't inject an object whose lifespan is shorter than the target.

JSF is not very friendly to request-scope objects, however, so you can't use them as often as you would in most web frameworks.

Injecting EJBs into JSF backing/managed beans is possible, but rarely a good idea, since you're injecting a specific instance statically declared, and most of the time you want the EJBs to be more dynamic than that.