A null return value (including void) may be interpreted as the
end of request processing in combination with a @ResponseStatus
annotation, a not-modified check condition
(see ServletWebRequest.checkNotModified(long)), or
a method argument that provides access to the response stream.
Rossen Stoyanchev, Juergen Hoeller
Nested Class Summary
Nested classes/interfaces inherited from class org.springframework.web.method.HandlerMethod