JEP 525 introduces structured concurrency as a sixth preview API in JDK 26, providing the StructuredTaskScope class to simplify concurrent programming. The API treats groups of related tasks running in different threads as single units of work, enabling automatic error handling, cancellation propagation, and improved observability. Key features include short-circuiting on failure, automatic cleanup of subtasks, and hierarchical thread relationships that mirror code structure. The preview includes minor refinements like a new onTimeout method in the Joiner interface and changes to method return types for better usability.
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