Shiro support of a {@link SecurityManager} class hierarchy that delegates all {@link hunt.shiro.session.Session session} operations to a wrapped {@link hunt.shiro.session.mgt.SessionManager SessionManager} instance. That is, this class implements the methods in the {@link SessionManager SessionManager} interface, but in reality, those methods are merely passthrough calls to the underlying 'real' {@code SessionManager} instance. <p/> The remaining {@code SecurityManager} methods not implemented by this class or its parents are left to be implemented by subclasses. <p/> In keeping with the other classes in this hierarchy and Shiro's desire to minimize configuration whenever possible, suitable default instances for all dependencies will be created upon instantiation.