JEP 401 (Value Objects, Preview) and JEP 539 (Strict Field Initialization in the JVM, Preview) have been integrated into the openjdk/jdk repository as part of JDK 28. The Valhalla team has completed this integration work, and the repository is now open for large re-work commits without restrictions.
Questions this post answers
Has JEP 401 Value Objects been integrated into JDK 28?
Yes, JEP 401 (Value Objects, Preview) and JEP 539 (Strict Field Initialization in the JVM, Preview) have both been integrated into the openjdk/jdk repository for JDK 28. The integration was completed by the Valhalla team, and the repository is now open for large re-work commits without any further holds. Java developers tracking Project Valhalla milestones follow JDK integration announcements like this on daily.dev.
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