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Discussion on: Java Fibers (Project Loom) vs. Kotlin Coroutines...

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Take a look at the following article:
Basically, Kotlin coroutines are executed at compile time while Java fibers have runtime support since the JVM has fibers implemented natively. Kotlin's coroutines are finally transformed by the compiler and remain thread-blocking.

Regarding reactive solutions and issues, you can check Project Loom Team Lead comments: and Tomek Nurkiewicz talk: