According to InfoQ's report, JEP 543 Finalizes Structured Concurrency in JDK 28, Ending Seven Preview Rounds , Java's structured concurrency API ( StructuredTaskScope ) has been integrated into JDK 28 as a final feature. The deciding detail is that the API has no changes from the seventh preview in JDK 27. InfoQ says that if your code already runs on JDK 27, migrating comes down to recompiling without the --enable-preview flag. JDK 28 is scheduled for general availability in March 2027.

The background you need

JEP stands for JDK Enhancement Proposal . It is the design document for a change to the Java platform. A new JDK ships every six months, and each release picks up a set of JEPs.

New Java APIs often pass through trial stages before they become permanent.

An incubator API lives in a separate, clearly experimental module.

A preview feature is fully specified but not yet locked in.…