We basically rely on Spring Frameworks parameter name detection here. I wasn't aware that anything special needs to be done from a Kotlin point of view. Juergen Hoeller, Sébastien Deleuze — can anyone of you chime in here?
FYI SPR-15541 is now fixed and available in Spring Framework 5 snapshots, as well as in the upcoming Spring Framework 5 RC4, so I think on Framework side we should be fine now, see this commit for more details.
Christoph Leiter Could you perform new tests using Spring Boot 2.0 an Spring Framework 5 snapshots with Spring Data JPA?