Java 21 Virtual Threads + AI Workloads: What the Benchmarks Don't Show You (And What 16 Years Does)

Java 21 introduces Project Loom with virtual threads, enhancing concurrency by allowing carrier threads to handle other tasks while virtual threads block during I/O operations. However, developers must be cautious of pinning issues where a blocked virtual thread holds a synchronized monitor and remains tied to the carrier thread, negating performance benefits. To mitigate this, using diagnostic flags like jdk.tracePinnedThreads=full is crucial for identifying potential bottlenecks in staging environments.

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