Introduction and pitfalls of Java's new concurrency model
summary
Java 20/21 virtual threads run as heap‑allocated stacks so creating 100,000 virtual threads in ~225 MB is feasible; demo shows 10,000 sleeping VT tasks start instantly via Executors.newVirtualThreadPerTask. Virtual threads execute on platform carrier threads and are unmounted on blocking calls, but remain pinned by synchronized/native/JNI/file I/O, losing benefits. Structured concurrency (StructuredTaskScope) provides shutdown policies (on success/failure) and examples: fork two tasks, join first result or cancel all on any exception.
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chapters (6)
- 0:00Start
- 0:36Outline
- 3:40One thread for each task
- 6:32Virtual threads
- 17:00How does it work
- 21:33Structured concurrency
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