Netflix has an extensive history of using Java as our primary programming language across our vast fleet of microservices. As we pick up newer versions of Java, our JVM Ecosystem team seeks out new…

The Netflix Tech Blog provides insights into the engineering practices, architecture, and innovations behind the Netflix streaming platform. Developers can learn about Netflix's microservices architecture, data infrastructure, and machine learning algorithms, as well as explore topics such as video encoding, content delivery, and personalization algorithms used in the Netflix service.

Netflix TechBlog

Netflix engineers encountered issues with virtual threads in Java 21 causing timeouts and hung instances in their microservices running on SpringBoot 3 and embedded Tomcat. Detailed diagnostics revealed that virtual threads were waiting for reentrant locks, with OS threads pinned and unable to release, leading to a variation of deadlock. The investigation and resolution process underscores the challenges and potential of adopting virtual threads for improved performance.

Java 21 Virtual Threads - Dude, Where’s My Lock?