Spring Integration issues have moved to GitHub
Please create new Spring Integration issues at GitHub. Existing Jira issues will be worked on from here.
See SPR-11829, SPR-12171.
https://github.com/spring-projects/spring-framework/commit/0dc6082b01606c3c996b728541467ba5104b747f
https://github.com/spring-projects/spring-framework/commit/5790fc904af9df90774d6c7b848b82af8b75103a
SPR-11829 Support for java.util.Optional as a @RequestParam
SPR-12171 Consistent support for java.util.Optional for all applicable handler method arguments