config/src/main/java/org/springframework/security/config/annotation/web/configurers/RequestCacheConfigurer.java
private RequestCache getRequestCache(H http) {
		RequestCache result = http.getSharedObject(RequestCache.class);
		if (result != null) {
			return result;
		}
		result = getBeanOrNull(RequestCache.class);
		if (result != null) {
			return result;
		}
		HttpSessionRequestCache defaultCache = new HttpSessionRequestCache();
		defaultCache.setRequestMatcher(createDefaultSavedRequestMatcher(http));
		return defaultCache;
	}
private RequestCache getRequestCache(H http) {
		RequestCache result = http.getSharedObject(RequestCache.class);
		if (result != null) {
			return result;
		}
		result = getBeanOrNull(RequestCache.class);
		if (result != null) {
			return result;
		}
		HttpSessionRequestCache defaultCache = new HttpSessionRequestCache();
		defaultCache.setRequestMatcher(createDefaultSavedRequestMatcher(http));
		return defaultCache;
	}
private RequestCache getRequestCache ( H http ) { RequestCache result = http . getSharedObject ( RequestCache . class ) ; if ( result != null ) { return result ; } result = getBeanOrNull ( RequestCache . class ) ; if ( result != null ) { return result ; } HttpSessionRequestCache defaultCache = new HttpSessionRequestCache ( ) ; defaultCache . setRequestMatcher ( createDefaultSavedRequestMatcher ( http ) ) ; return defaultCache ; }
Gets the {@link RequestCache} to use. If one is defined using
{@link #requestCache(org.springframework.security.web.savedrequest.RequestCache)},
then it is used. Otherwise, an attempt to find a {@link RequestCache} shared object
is made. If that fails, an {@link HttpSessionRequestCache} is used

@param http the {@link HttpSecurity} to attempt to fined the shared object
@return the {@link RequestCache} to use
Gets the { @link RequestCache } to use . If one is defined using { @link #requestCache ( org . springframework . security . web . savedrequest . RequestCache ) } then it is used . Otherwise an attempt to find a { @link RequestCache } shared object is made . If that fails an { @link HttpSessionRequestCache } is used