Review all spring context files and ensure appropriate Spring namespaces are defined and available for easier overlays. This will include the following namespaces at a minimum to review:
Adjust the configuration as needed to use namespaces instead. Furthermore, relax the configuration to remove the versionized form of namespaces from the configuration to avoid and remove future maintenance during Spring upgrades.
List of schemas is available at this link: http://www.springframework.org/schema/