Support running Kotlin Spring apps without kotlin-reflect.jar [SPR-17069]

[spring-projects-issues]

Sébastien Deleuze opened SPR-17069 and commented

As described in #21546 and as benchmarked in the attached flamegraph, using kotlin-reflect.jar is not a free lunch, and for functional Spring application without Jackson, it does not bring any value so we should support running Spring Framework 5.1 without this dependency as part of our performance improvement theme.

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Attachments:

• flamegraph-java-jackson.svg (825.06 kB)

Issue Links:

• Optimize Kotlin reflection runtime efficiency #21546 Support for kotlinx.reflect.lite

Referenced from: commits f8f8d28