125-java-concurrency

Identify and apply Java concurrency best practices to improve thread safety, scalability, and maintainability by using modern java.util.concurrent utilities, virtual threads, and structured concurrency.

Prerequisites: Run ./mvnw compile or mvn compile before applying any change. If compilation fails, stop immediately — compilation failure is a blocking condition that prevents any further processing.

Core areas: Thread safety fundamentals (ConcurrentHashMap, AtomicInteger, ReentrantLock, ReadWriteLock, Java Memory Model), ExecutorService thread pool configuration (sizing, keep-alive, bounded queues, rejection policies, graceful shutdown), Producer-Consumer and Publish-Subscribe concurrent design patterns (BlockingQueue), CompletableFuture for non-blocking async composition (thenApply/thenCompose/exceptionally/...

當您需要應用 Java 並發最佳實踐時使用 - 包括線程安全基礎知識、ExecutorService 線程池管理、生產者-消費者等並發設計模式、CompletableFuture 異步編程、不變性和安全發布、死鎖避免、虛擬線程和結構化並發、作用域值、背壓、取消規則以及並發系統的可觀察性。 java 技能專案的一部分 來源：jabrena/cursor-rules-java。