This class is the contextual service implementation for javax.servlet.ServletContext. It
acts as an intermediary between the client and the ServletContext instance held by the
associated ServletBeanContext. It validates that attempt to access the ServletContext
only occur during the servlet request processing lifecycle, then delegates to the underlying
ServletContext instance for actual services.
This method retrieves the current ServletBeanContext for the service. It is capable
of reassociating with the current active context, if the service instance has been
serialized/deserialized.