Interceptors have the same life cycle as the bean they intercept.
for stateless beans i guess one implementation can be one (or a pool of) interceptor instance.
but for stateful session bean, they are activated and passivated along with the bean, so does
that mean for every instance of stateful bean the container create and associate a whole bunch
of interceptors with it? (not to mention any resource injection they might have. sounds like memory eating to me...)