Introduction and pitfalls of Java's new concurrency model
summary
Java 20/21 brings Project Loom virtual threads that let the JVM create thousands cheaply, demonstrated by running 10,000 virtual threads on a laptop; they run on a small number of OS carrier threads and swap via mounting/unmounting. Structured concurrency (StructuredTaskScope) provides shutdown policies — shutdown-on-success, shutdown-on-failure — and examples show custom scopes to stop when a product under a price is found. Watch for pitfalls: pinning (synchronized, native calls, some filesystem ops) and long CPU-bound tasks that negate benefits.
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chapters (12)
- 0:00Introduction to talk
- 0:23Current Java concurrency model
- 1:05Virtual threads overview
- 6:09Creating virtual threads
- 9:19Demo virtual threads
- 13:16How virtual threads run
- 15:44Pitfalls of virtual threads
- 17:34Structured concurrency intro
- 21:07Structured concurrency demo
- 25:50Custom shutdown policies
- 29:28Summary and next steps
- 30:11Q&A session
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