Add additional @ConditionalOnMissingBean guards to session
configurations to ensure that the first wins. Also reorder imports
to prefer Redis over JDBC.
See gh-5158
This commit adds support for automatically configuring Spring Session.
In a web application when both Spring Session and Spring Data Redis
are on the classpath, Spring Session's Redis Http Session support
will be auto-configured. The max inactive interval for Redis-backed
sessions can be configured via the environment using the existing
server.session-timeout property.
Closes gh-2318
Andy Wilkinson
Phillip Webb