advancedMultithreading & Concurrency369 of 436
Will synchronized in a Spring Boot service prevent duplicate orders across 3 instances? Can synchronized protect data stored in a database?
Tests whether you know synchronized only coordinates threads within a single JVM -- it has zero effect across 3 separate instances, each with its own lock, and it never protects database state since a second process can mutate the same row through a completely different lock.
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