seniorSpring
How does Spring Boot handle synchronous vs asynchronous bottlenecks?
Updated May 17, 2026
Short answer
Synchronous calls block threads, while asynchronous processing decouples execution.
Deep explanation
Spring MVC is thread-per-request model, so blocking calls reduce scalability. Async processing (@Async, WebFlux) improves throughput but adds complexity in error handling and context propagation.
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