JEP proposed to target JDK 24: 487: Scoped Values (Fourth Preview)

Mark Reinhold mark.reinhold at oracle.com
Wed Oct 23 13:57:24 UTC 2024


The following JEP is proposed to target JDK 24:

  487: Scoped Values (Fourth Preview)
       https://openjdk.org/jeps/487

  Summary: Introduce scoped values, which enable a method to share
  immutable data both with its callees within a thread, and with child
  threads.  Scoped values are easier to reason about than thread-local
  variables.  They also have lower space and time costs, especially when
  used together with virtual threads (JEP 444) and structured concurrency
  (JEP 480).  This is a preview API.

Feedback on this proposal from JDK Project Committers and Reviewers [1]
is more than welcome, as are reasoned objections.  If no such objections
are raised by 16:00 UTC on Wednesday, 30 October, or if they’re raised
and then satisfactorily answered, then per the JEP 2.0 process proposal
[2] I’ll target this JEP to JDK 24.

- Mark


[1] https://openjdk.org/census#jdk
[2] https://cr.openjdk.java.net/~mr/jep/jep-2.0-02.html


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