"Formerly known as Stable Values and Computed Constants, this JEP proposes a second preview, with changes, after the first round of preview, namely: JEP 502, Stable Values (Preview), for JDK 26. This feature introduces the concept of computed constants, defined as immutable value holders that are initialized at most once."
"This feature simplifies concurrent programming by introducing the concept of structured concurrency to " treat groups of related tasks running in different threads as a single unit of work, thereby streamlining error handling and cancellation, improving reliability, and enhancing observability." The only significant change is the addition of a method to the StructuredTaskScope.Joiner interface, that allows for implementations of that interface to return a result after the timeout expires."
JEP 526, Lazy Constants (Second Preview), has been elevated from JEP Draft 8359894 to Candidate status. The feature introduces computed constants, immutable value holders initialized at most once, offering field-like performance and safety with flexible initialization timing. The JEP was renamed from Stable Values to Lazy Constants and includes enhanced discoverability. JEP 525, Structured Concurrency (Sixth Preview), advanced to Candidate status after prior previews in JDK 19–25. Structured concurrency treats related tasks across threads as a single unit to improve error handling, cancellation, reliability, and observability; a new Joiner method allows returning results after timeouts. JDK 26 build 17 and multiple ecosystem releases were published, including Liberica Native Image Toolkit 25, Open Liberty October 2025, Spring AI 1.1.0 milestone, and point releases for JobRunr, LangChain4j, and Quarkus.
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