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3d1fa4f6b6
The "default" FlashMapManager implementation added in 3.1 was invoked after the redirect, which is too late in cases where the HTTP session has not been yet been created since as the response is committed. This change corrects the issue and makes other improvements to the FlashMapManager implementation such as extracting a base AbstractFlashMapManager class and making it easier for other implementations to be added (for example cookie-based).