What is virtual thread support in Spring Framework 7?

Virtual threads, a JVM feature from Project Loom, are lightweight threads that the JVM schedules onto a small pool of OS threads, letting an application handle enormous numbers of concurrent blocking calls without the memory overhead of one OS thread per request. Spring Framework 7 lets a traditional Spring MVC application run its request-handling on virtual threads instead of a fixed platform-thread pool.

spring.threads.virtual.enabled=true

Because virtual threads are cheap to create and block, this can dramatically improve throughput for I/O-bound MVC applications - the kind that spend most of their time waiting on a database or a downstream HTTP call - without rewriting the code in a reactive style using WebFlux.

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