Project Loom in IntelliJ IDEA: Virtual Threads, Scoped Values, and Structured Concurrency - The JetBrains Blog
Blog post from JetBrains
Project Loom modernizes Java concurrency through virtual threads, scoped values, and structured concurrency, aiming to make highly concurrent applications more scalable, understandable, and reliable than approaches based on platform-thread pools, CompletableFuture, and ThreadLocal variables. Virtual threads, stable since Java 21, are lightweight JVM-managed threads suited to blocking I/O workloads, while scoped values, stable since Java 25, provide immutable and automatically cleaned-up contextual data sharing. Structured concurrency, a preview feature in Java 27, organizes related subtasks into bounded scopes with coordinated joining, automatic cancellation, explicit failure policies, and improved observability. Using a customer-profile example that retrieves orders and recommendations concurrently, the post contrasts manual timeout handling, cancellation, exception unwrapping, and fragile context propagation with a Loom-based implementation that expresses these policies directly through StructuredTaskScope and ScopedValue. It also describes IntelliJ IDEA support for creating, debugging, and inspecting virtual and structured threads, including thread dumps that show task hierarchies, and outlines how to configure Java 27 early-access and preview features for experimentation.
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