Support Kotlin nullable information for @Autowired and @Inject [SPR-14951]

[spring-projects-issues]

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.

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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

[spring-projects-issues]

Juergen Hoeller commented

Implemented in MethodParameter.isOptional() and DependencyDescriptor.isRequired() now, with private inner delegate classes for Kotlin introspection (superseding KotlinUtils and avoiding its circular reference with MethodParameter between .core and .util).