java-concurrency
Implement modern concurrency with Virtual Threads and Structured Concurrency in Java. Use when implementing Java Virtual Threads (Java 21), Structured Concurrency with StructuredTaskScope, CompletableFuture pipelines, or debugging race conditions.
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SKILL.md
Java Concurrency
Priority: P1 (HIGH)
Implementation Guidelines
- Virtual Threads (Java 21): Use for high-throughput I/O.
Executors.newVirtualThreadPerTaskExecutor(). - Structured Concurrency: Use
StructuredTaskScopeto treat related tasks as single unit (Scope, Fork, Join). - Immutability: Share immutable data between threads to avoid race conditions.
- CompletableFuture: Use for composing async pipelines (if not using Virtual Threads).
- Atomic Variables: Use
AtomicInteger,LongAdderfor simple counters. - Locks: Prefer
ReentrantLock/ReadWriteLockoversynchronizedfor fine-grained control. - Thread Safety: Document
@ThreadSafeor@NotThreadSafe.
Anti-Patterns
- No new Thread(): Use Executors or virtual threads; never create threads manually.
- No Pooling Virtual Threads: Virtual threads cheap; never pool them.
- No Blocking in synchronized: Pins carrier thread (Loom pitfall); use ReentrantLock instead.
- No Shared Mutable State: Share only immutable data between threads.
- No Thread.stop/suspend: Deprecated; use interruption or cancellation instead.
References
Files
3- SKILL.md
8ee2b6f5041.8 KB - evals/evals.json
9f4f2963f53.4 KB - references/structured-concurrency.md
de70a2c55e1.4 KB
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