>> Do the various subsystems of JBoss implement the Agent Level?
>
> All subsystems are instrumented MBeans. Period.
>
> Does inheritance from JBoss classes automatically instrument our EJBs?
>
> No.... the actual EJB's have nothing to do with JMX. They exist only under
> the premises of the EJB/J2EE spec. And where did you get inheritance from
> JBoss classes? What classes are you referring to? When you build your EJB's
> you don't do anything JBoss related. JBoss just runs 'em.

In hindsight it was a silly question. I have a habit of matched pairs of interfaces 
and base classes (into which I might put such instrumentation) with everything 
inheriting from the base class rather than directly implementing the interface, but 
this couldn't possibly be the way with JBoss; that would make it fundamentally 
different from all other containers.

I was just trying to work out how everything gets instrumented, and the extent of 
"everything".

My lesson for today is "engage brain before opening mouth".
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