Resolves the {@code SecurityManager} instance that should be used to back the constructed {@link Subject}
instance (typically used to support {@link hunt.shiro.subject.support.DelegatingSubject DelegatingSubject} implementations).
@return the {@code SecurityManager} instance that should be used to back the constructed {@link Subject}
instance
Resolves the {@code SecurityManager} instance that should be used to back the constructed {@link Subject} instance (typically used to support {@link hunt.shiro.subject.support.DelegatingSubject DelegatingSubject} implementations).
@return the {@code SecurityManager} instance that should be used to back the constructed {@link Subject} instance