This operation is a convenience helper that checks the type safety for the
attributes of type Boolean.This operation throws an appropriate exception,
or returns a primitive boolean for a given attribute.
This operation is responsible for checking that the named managed bean
has or has not bean created before, and if not creates, and stored the
managed bean under it's configured scope.
This operation is a convenience helper that checks the type safety for the
attributes of type String.This operation throws an appropriate exception,
or returns the down-casted string for a given attribute.