An object of this class implements the MBeanServer interface
and, for each of its methods, calls an appropriate checking method
and then forwards the request to a wrapped MBeanServer object.
An object of this class implements the MBeanServerAccessController
interface and, for each of its methods, calls an appropriate checking
method and then forwards the request to a wrapped MBeanServer object.
The checking method may throw a SecurityException if the operation is
not allowed; in this case the request is not forwarded to the
wrapped object.