For two years, virtual threads had full support in the Java platform. In this presentation, we will have a second look at virtual thread performance, memory usage, platform support, and more advanced features, in particular, structured concurrency and scoped values. You will learn about effective patterns for structured concurrency, how to monitor virtual threads in practice, how to detect overuse of thread locals, and how to use scoped values as a more performant replacement. This topic should be of interest to all developers who want to reduce the cost of deploying business applications that \"mostly block\" (waiting for results from databases or other services), without the pain of implementing business logic in a reactive style.

Java 21 has introduced virtual threads, taking multi-threading design and performance to the next level. In this talk, we will discuss Virtual Threads from the inside out, including how it is done and how and when you should and should not use it. will discuss Virtual Threads from the inside out, including how it is done, and how and when you should and should not use it.