Java: Project Reactor: Mono

WebFlux is non-blocking, while Virtual Threads mimic blocking behavior with lightweight threads.

WebFlux provides a non-blocking, event-driven architecture, ideal for high-concurrency scenarios without extensive thread management. Virtual Threads, on the other hand, offer a more traditional blocking style but with lightweight threads, making them easier to write for developers familiar with blocking code. In an e-commerce application, WebFlux might excel in handling many concurrent users, while Virtual Threads could simplify transitioning from a blocking architecture.