3 posts
The final part of the JVM concurrency series. A four-question framework for choosing between Virtual Thread, Reactor, and Coroutines, plus the unique strengths of each technology and the most common misconceptions.
How Spring wraps suspend fun in mono {} to run it on the Reactor pipeline, and the structural limit where AOP proxies mistake COROUTINE_SUSPENDED for method completion — including why @Transactional + coroutines does not work.
Writing Reactor-style deep flatMap chains as sequential, synchronous-looking code with Kotlin Coroutines. Covers suspend, CPS transformation, state machines, Flow, Channel, and structured concurrency.