Raúl González Vicente & Jose Antonio Beltrán Márquez - Java Dark Threads
“Java Dark Threads” explores the hidden forces shaping concurrency in modern JVM systems, much like dark matter shaping the universe. Virtual Threads promise to illuminate long-standing complexity, but real adoption demands understanding what lies beneath. This session examines their behavior in high-concurrency and I/O-intensive workloads, their impact on the Java Memory Model and scheduling, and how they differ from reactive or thread-pool models. We will assess ecosystem readiness across Reactor/Netty, Kafka, Spring Boot 3.x, Undertow, and Tomcat, highlighting where invisible blocking or contention can distort performance. Attendees will learn practical patterns, anti-patterns, and migration strategies to bring clarity to these “dark” areas and decide when Virtual Threads truly add value in production architectures.
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