One of the primary functions of a BeanContext is to act a as rendezvous
between JavaBeans, and BeanContextServiceProviders.
A JavaBean nested within a BeanContext, may ask that BeanContext to
provide an instance of a "service", based upon a reference to a Java
Class object that represents that service.
If such a service has been registered with the context, or one of its
nesting context's, in the case where a context delegate to its context
to satisfy a service request, then the BeanContextServiceProvider associated with
the service is asked to provide an instance of that service.
The ServcieProvider may always return the same instance, or it may
construct a new instance for each request.
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