Java / Java 21 Virtual Threads Interview questions
What is the purpose of virtual threads?
Virtual threads exist to raise the throughput of concurrent applications that spend most of their time waiting on I/O, such as network calls or database queries, without forcing developers into reactive or callback-based code.
Before Java 21, scaling I/O-bound concurrency usually meant either exhausting OS threads with a thread-per-request model, or rewriting logic around asynchronous, non-blocking APIs that are harder to write, read, and debug.
Virtual threads keep the simple, synchronous style of code while the JVM handles the heavy lifting of not wasting an OS thread while that code is blocked.
Virtual threads primarily target which kind of workload?
A key benefit of virtual threads over reactive programming is:
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