Sébastien Deleuze opened SPR-14951 and commented

As implemented form Spring MVC/Spring Web Reactive in #18737, we could use Kotlin nullable information to know if a bean is required or not.

Issue Links:

• Support Kotlin nullable information in Spring MVC parameters [SPR-14165] #18737 Support Kotlin nullable information in Spring MVC parameters
• Support @Nullable annotations as indicators for optional injection points [SPR-15028] #19595 Support @Nullable annotations as indicators for optional injection points

Referenced from: commits 39d2769