Virtual Threads, Structured Concurrency, and Scoped Values: Explore Java’s New Threading Model

language. Project Loom adds virtual threads, structured concurrency, and scoped values which

help you as a developer to write better concurrent applications. Each of the chapters gives you an

introduction to the topic and shows you when you should consider it or totally avoid it.

Chapter 1: The first chapter covers what virtual threads are and how they are different from the

threads that we already had in previous Java versions. This will show the life cycle virtual threads

go through while executing code and how it works or doesn’t work in some situations.

Chapter 2: This chapter covers structured concurrency which is a totally new concept that has

been added to the Java language. You will learn new ways of managing the lifetime of your

threads and how to make relationships between threads more explicit.

Chapter 3: The third chapter covers a new and immutable way of sharing values between

threads. With previous versions of Java, you could use thread local variables, but with Java 21

there is a new way that is better fitted to use with virtual threads. You will learn how these scoped

values work and how they work with structured concurrency.

Chapter 4: In the final chapter, we go over how to reason about virtual threads, so you know

how to best apply them and how to use them with common patterns. You will also learn how to

start using virtual threads inside your Spring or Quarkus applications.