Injection vs. Component.getInstance()

[daxxy]

I'm trying to understand something.

I write a custom envers RevisionListener in which I need access to the seam identity component from the Session context.  The following code works:

public class IdentityListener implements RevisionListener {

        public void newRevision(Object revisionEntity) {
                Identity id = (Identity) Contexts.getSessionContext().get("org.jboss.seam.security.identity");
                IdentityRevisionEntity revEntity = (IdentityRevisionEntity) revisionEntity;
        }       

}

Before that, however, I tried injecting the session context using

@In
Context sessionContext

and various other components, context variables, etc., but in every case got null.

What is special about this class that injection does not work?  I tried making it into a Seam component, but that didn't help either.

Can someone explain what I'm assuming is something basic to seam and/or java?

TDR

[cbensemann]

Hi,

I assume your revisionListener isn't a seam component (i.e. its not annotated with @Name). Seam is only able to inject objects into classes that are managed by seam. Also injection will not work on any class marked with @BypassInterceptors annotation. In these cases you can use one of the org.jboss.seam.Component.getInstance() methods to get hold of your seam objects.

Craig

[daxxy]

Same problem even if I make it a seam component.

[nraf]

I'm having a similar issue. I've registered an event listener (using Events.instance().raiseASynchronousEvent(...)') and am trying to get some Seam components using Component.getInstance(). The objects are coming back but all their values are either 0 or null.