JEP draft: Structured Concurrency

A JEP draft proposes finalizing Structured Concurrency as a standard feature in JDK 28, introducing the StructuredTaskScope API to the java.util.concurrent package. The feature, which has gone through multiple preview rounds since JDK 19 (JEP 428), lets developers treat groups of related tasks running on different threads as a single unit of work, simplifying error handling, cancellation propagation, and observability compared to the unstructured ExecutorService/Future model. The proposal for JDK 28 carries no API changes from JDK 27's JEP 533, which added a type parameter for the exception thrown by join(). The document details the StructuredTaskScope interface, fork/join workflow, built-in and custom Joiners, cancellation semantics, scoped value inheritance, exception handling patterns, configuration options (timeouts, thread factories), thread-dump observability enhancements, and alternatives considered and rejected, such as enhancing ExecutorService directly or having fork return a Future.

Source: https://openjdk.org/jeps/8389757. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.