question: obtain a mutex for modifying the flashmap list as handled by #retrieveflashmaps and #updateflashmaps , the default implementation returns a shared static mutex . subclasses are encouraged to return a more specific mutex , or null to indicate that no synchronization is necessary . concode_field_sep Log logger concode_elem_sep UrlPathHelper urlPathHelper concode_elem_sep int flashMapTimeout concode_elem_sep Object DEFAULT_FLASH_MAPS_MUTEX concode_field_sep List<FlashMap> getExpiredFlashMaps concode_elem_sep boolean isFlashMapForRequest concode_elem_sep void setFlashMapTimeout concode_elem_sep int getFlashMapTimeout concode_elem_sep UrlPathHelper getUrlPathHelper concode_elem_sep String decodeAndNormalizePath concode_elem_sep FlashMap retrieveAndUpdate concode_elem_sep void updateFlashMaps concode_elem_sep List<FlashMap> retrieveFlashMaps concode_elem_sep void saveOutputFlashMap concode_elem_sep FlashMap getMatchingFlashMap concode_elem_sep void setUrlPathHelper
target: Object function ( HttpServletRequest arg0 ) { return DEFAULT_FLASH_MAPS_MUTEX ; }